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1

The effect of the remelting and laser surface alloying of titanium grade 5 (Ti6-Al-4V) on erosive wear resistance

Poloczek Tomasz, Kwaśny Waldemar, Czupryński Artur

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2022

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Vol. 66, No. 2

23--32

EN

The article presents the effect of the remelting and alloying of titanium grade 5 (Ti6-Al-4V) on erosive wear resistance (in accordance with the ASTM G76-04 standard). The study involved tests concerning the effect of graphite on the in-situ synthesis of titanium carbide during alloying performed using a Trudisk 3302 disk laser. The study also involved hardness measurements of individual beads as well as macro and microscopic tests. The tests involving the use of a Phenom World PRO scanning electron microscope provided with an EDS analyser as well as the X-ray phase analysis revealed the possible synthesis of titanium carbide during the laser alloying of the titanium surface with graphite. The erosive wear resistance of beads reinforced with composite particles was higher than that of the material in the as-received state, yet lower than that of the material remelted without the use of the alloying material.

PL

W artykule przedstawiono wpływ przetapiania oraz stopowania tytanu Grade 5 (Ti6-Al-4V) na odporność erozyjną, zgodnie z normą ASTM G76-04. Przebadano wpływ grafitu na możliwość syntezy in situ węglika tytanu w procesie stopowania laserowego, wykorzystując laser dyskowy Trudisk 3302. Wykonano pomiary twardości poszczególnych ściegów oraz badania metalograficzne makro- i mikroskopowe. Przeprowadzone badania na skaningowym mikroskopie elektronowym PhenomWorld PRO, wyposażonym w analizator EDS, oraz rentgenowska analiza fazowa wykazały możliwość syntezy węglika tytanu w procesach stopowania laserowego powierzchni tytanu grafitem. Odporność na zużycie erozyjne ściegów wzmocnionych cząstkami kompozytowymi wykazała polepszenie własności względem materiału w stanie dostawy, natomiast osiąga niższe wartości względem materiału przetopionego bez udziału materiału stopującego.

2

Microstructural tests and hardness tests of surface layers of nodular cast iron GJS-350 made using the laser surface alloying process

Sacha Denis

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2021

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Vol. 65, No. 6

37--45

EN

The article presents test results concerning the microstructure and the hardness of a composite layer made on a substrate of nodular cast iron GJS-350 using the laser surface alloying method. The alloying agent used in the test was powdered titanium. The study consists of an overview of reference publications aimed to introduce the most important aspects concerning the issue subjected to analysis. The research part presents the methodology of tests as well as their results and analysis. Microscopic analysis revealed that the layer structure was fine-grained and highly homogenous, whereas hardness measurements revealed that the titanium-enriched layer was characterised by significantly higher micro-hardness than that of the base material.

PL

Artykuł przedstawia wyniki badań mikrostruktury i twardości wytworzonej warstwy kompozytowej na podłożu z żeliwa sferoidalnego GJS-350 metodą stopowania laserowego. Jako dodatku stopującego użyto tytanu w postaci proszku. Praca składa się z przeglądu literatury, który ma przybliżyć najważniejsze zagadnienia dotyczące analizowanego problemu. W części badawczej przedstawiono metodologię prowadzonych badań naukowych oraz uzyskane wyniki i ich analizę. Przeprowadzona analiza mikroskopowa pozwoliła ustalić, że wytworzona warstwa ma drobnoziarnistą strukturę o wysokiej jednorodności. Natomiast badania twardości potwierdziły, że warstwa wzbogacona w dodatek tytanu wykazuje znacznie wyższą mikrotwardość niż materiał podłoża.

3

Comparative study of laser melting and pre‑placed Ni–20% Cr alloying over nodular iron surface

Jeyaprakash N., Yang Che-Hua, Duraiselvam Muthukannan, Sivasankaran S.

Archives of Civil and Mechanical Engineering

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2020

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Vol. 20, no. 1

282--293

EN

In this study, two techniques such as laser surface melting (LSM) and laser surface alloying (LSA) were performed to protect the surface layers of nodular cast iron as it is used to manufacture different machine parts like cams, beds, camshafts, crankshafts, cylinders and engine blocks. The main objective of this research work is to examine the effects of LSM and LSA processes on phases, microstructure, hardness, wear resistance and surface roughness. The outcomes of both LSM and LSA specimens show a homogeneous structure, effective bonding of alloy powders with the base metal and crack-free surfaces. The hardness was improved 4 times (LSM) and 2.62 times (LSA) when compared with the base material. The tribological test shows improved wear resistance of LSM (8.82 × 10−7 kN) and LSA (1.32 × 10−6 kN) samples compared to the base material (4.36 × 10−6 kN). The examined wear tracks indicate that mild abrasion, adhesion and delamination were the major wear mechanisms. The reason for the enhancement of wear resistance is the refinement of microstructure, the solid solution strengthening effect and good bonding between alloy powders and base material. The LSM technique is a potential method to improve the tribological properties of industrial materials.

4

Laser surface alloying of ductile cast iron with Ti + 5% W mixture

Kotarska Aleksandra

Welding Technology Review

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2019

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R. 91, nr 5

19--25

EN

The article presents results of the research on laser alloying of the ductile cast iron EN-GJS 350-22 substrate with the mixture of titanium powder with addition of 5 wt.% of tungsten. The aim of the process was to obtain surface layer with the in-situ composite structure. Laser alloying process was carried out using high power diode laser (HPDDL) with rectangular laser beam focus and uniform power density distribution in one axis of the beam focus (top-hat profile). The tests included determination of the influence of process parameters on the dimensions of the alloyed beads, metallographic macroscopic and microscopic observations, microhardness measurements of the laser alloyed layers and EDS chemical composition tests.

PL

Artykuł przedstawia wyniki badań nad stopowaniem laserowym żeliwa sferoidalnego EN-GJS 350-22 mieszaniną proszku tytanu z dodatkiem 5 %wag. wolframu. Celem procesu było uzyskanie warstwy wierzchniej o strukturze kompozytowej metodą in-situ. Proces stopowania przeprowadzony został z wykorzystaniem lasera diodowego dużej mocy HPDDL o ognisku prostokątnym i równomiernym rozkładzie gęstości mocy w jednej osi ogniska (top-hat profile). Badania obejmowały określenie wpływu parametrów procesu na wymiary ściegów stopowanych, obserwacje makroskopowe i mikroskopowe, pomiary mikrotwardości uzyskanych warstw wierzchnich oraz badania składu chemicznego EDS.

5

The corrosion resistance of laser surface alloyed stainless steels

Brytan Z.

Journal of Achievements in Materials and Manufacturing Engineering

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2018

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Vol. 91, nr 2

49--59

EN

Purpose: of this paper was to examine the corrosion resistance of laser surface alloyed (LSA) stainless steels using electrochemical methods in 1M NaCl solution and 1M H2SO4 solution. The LSA conditions and alloying powder placement strategies on the material's corrosion resistance were evaluated. Design/methodology/approach: In the present work the sintered stainless steels of different microstructures (austenitic, ferritic and duplex) where laser surface alloyed (LSA) with elemental alloying powders (Cr, FeCr, Ni, FeNi) and hard powders (SiC, Si3N4) to obtain a complex steel microstructure of improved properties. Findings: The corrosion resistance of LSA stainless steels is related to process parameters, powder placing strategy, that determines dilution rate of alloying powders and resulting steel microstructure. The duplex stainless steel microstructure formed on the surface layer of austenitic stainless steel during LSA with Cr and FeCr reveal high corrosion resistance in 1M NaCl solution. The beneficial effect on corrosion resistance was also revealed for LSA with Si3N4 for studied steels in both NaCl and H2SO4 solutions. Ferritic stainless steel alloyed with Ni, FeNi result in a complex microstructure, composed of austenite, ferrite, martensite depending on the powder dilution rate, also can improve the corrosion resistance of the LSA layer. Research limitations/implications: The LSA process can be applied for single phase stainless steels as an easy method to improve surface properties, elimination of porosity and densification and corrosion resistance enhancement regarding as sintered material. Practical implications: The LSA of single phase austenitic stainless steel in order to form a duplex microstructure on the surface layers result in reasonably improved corrosion performance. Originality/value: The original LSA process of stainless steels (austenitic, ferritic and duplex) was studied regarding corrosion resistance of the alloyed layer in chloride and sulphate solutions.

6

The Erosion Resistance and Microstructure Evaluation of Laser Surface Alloyed Sintered Stainless Steels

Brytan Z.

Archives of Metallurgy and Materials

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2018

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Vol. 63, iss. 4

2039--2049

EN

The sintered stainless steels of different microstructures (austenitic, ferritic and duplex) were laser surface alloyed with hard powders (SiC, Si3 N4 ) and elemental alloying powders (Cr, FeCr, FeNi) to obtain a complex steel microstructure of improved properties. Laser surface alloying (LSA) involved different strategies of powder placing: the direct powder feeding to the molten metal pool and filling grooves machined on the sample surface by powder, and then laser surface melting. Obtained microstructures were characterised and summarised, basing on LOM, SEM and XRD analysis. The links between base material properties, like superficial hardness and microhardness, derived microstructures and erosion resistance was described. The LSA conditions and alloying powder placement strategies on erosion resistance was evaluated. The erosion wear is lower for Cr, FeCr, FeNi laser alloying, where powders were dissolved in the steel microstructure, and hard phases were not precipitated. Precipitations of hard phases (carbides, silicides, martensite formation) reduce erosion resistance of SiC alloyed stainless steel. The LSA with Si3 N4 works better due to lack of precipitates and formation of a soft and ductile austenitic microstructure. The erosion wear at the impingement angle of 90° is high for hard and therefore brittle surface layers obtained as a result of alloying by hard particles (SiC, Si3 N4 ). The softer and ductile austenitic stainless steel resist better than harder ferritic and duplex stainless steel material at studied erodent im pingement angle.

7

Microstructural Evolution During Laser Surface Alloying of Ductile Cast Iron with Titanium

Janicki D.

Archives of Metallurgy and Materials

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2017

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Vol. 62, iss. 4

2425--2431

EN

Diode laser surface alloying process was used to the in-situ synthesis of TiC-reinforced composite surface layers on the ductile cast iron substrate. The obtained composite surface layers were investigated using optical and scanning electron microscopy, and XRD diffraction. It was found that the morphology and fraction of TiC phase is directly dependent upon both the concentration of titanium in the molten pool and also the solidification rate. With increasing titanium content, the fraction of TiC increases, whereas the fraction of cementite decreases. The TiC phase promotes a heterogeneous nucleation of primary austenite grains, what reduces a tendency of cracking in the alloyed layers.

8

Diode Laser Surface Alloying of Armor Steel with Tungsten Carbide

Janicki D., Górka J., Kwaśny W., Gołombek K., Kondracki M., Żuk M.

Archives of Metallurgy and Materials

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2017

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Vol. 62, iss. 2A

473--481

EN

Metal matrix composite (MMC) surface layers reinforced by WC were fabricated on armor steel ARMOX 500T plates via a laser surface alloying process. The microstructure of the layers was assessed by scanning electron microscopy and X-ray diffraction. The surface layers having the WC fraction up to 71 vol% and an average hardness of 1300 HV were produced. The thickness of these layers was up to 650 μm. The addition of a titanium powder in the molten pool increased the wettability of WC particles by the liquid metal in the molten pool increasing the WC fraction. Additionally, the presence of titanium resulted in the precipitation of the (Ti,W)C phase, which significantly reduced the fraction of W-rich complex carbides and improved a structural integrity of the layers.

9

The influence of laser surface alloying on the thermal fatigue resistance of hot work tool steels

Jonda E., Brytan Z., Labisz K., Drygała A.

Archives of Metallurgy and Materials

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2016

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Vol. 61, iss. 3

1309--1314

EN

The paper presents results of the effect of laser surface remelting and alloying by carbides powders of NbC, TaC, TiC, VC and WC on the structure and thermal fatigue resistance of the surface layer of hot work tool steels X40CrMoV5-l and 32CrMoV12-28. The laser surface alloying and remelting treatments was performed using a high power diode laser (HPDL ROFTN SLNAR DL 020). In order to investigate the effect of applied laser treatments and used alloying powders on the microstructure and thermal fatigue resistance of processed surface layer of hot work tool steels, the inicrostructure evaluation by light microscopy, hardness test, and dedicated thermal fatigue resistance test were performed. The best results regarding fatigue cracks inhibition was obtained when the surface of hot work tool steels was alloyed with TiC and VC carbides at the laser beam power of 2.0 and 2.3 kW. The grain refinement effect of laser remelting has a lower impact on the thermal crack inhibition, than a strong strengthening effect of matrix saturation in alloying elements and precipitation of fine carbides in the steel matrix.

10

Laser surface alloying of AlSi7Cu4MgMn aluminium alloy with silicon carbide

Irek P

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2014

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Vol. 58, No. 1

42--48

EN

The article presents the results of tests on the laser surface alloying of AlSi7Cu4MgMn aluminium alloy using silicon carbide. The objective of the tests was to establish the influence of laser beam power and travel rate, ceramic powder feeding rate and presence of activating flux on the quality of seams surface alloyed with an HPDDL laser using SiC particles as well as to determine the optimum technological process conditions. The assessment of the quality of surface alloyed seams was carried out using macro and microscopic examination verifying the proper generation of a composite layer on the surface and the percentage fraction of SiC particles in the root run. The article also presents the results of microhardness measurements in the cross-sections of laser-processed layers.

PL

Przedstawiono wyniki badań stopowania laserowego stopu aluminium AlSi7Cu4MgMn za pomocą węglika krzemu. Celem badań było określenie wpływu mocy wiązki laserowej, prędkości przesuwu wiązki laserowej, natężenia podawania proszku ceramicznego i obecności topnika aktywującego na jakość ściegów stopowanych laserem HPDDL z użyciem cząstek SiC oraz ustalenie optymalnych warunków technologicznych procesu. Ocenę jakości ściegów stopowanych przeprowadzono w oparciu o badania makro i mikroskopowe, które dotyczą poprawności utworzenia warstwy kompozytowej na powierzchni oraz udziału procentowego cząstek SiC w warstwie przetopowej. Ponadto wykonano pomiary mikrotwardości w przekrojach poprzecznych warstw obrabianych laserowo.

11

Nd: YAG laser treatment of aluminium - TiB2 coated: Optimization of corrosion properties

Popoola P. A. I., Pityana S. L., Fedotova T., Popoola O. M.

Materials Science Poland

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2011

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Vol. 29, No. 2

77--85

EN

As the reports in the literature regarding corrosion performance of Al/TiB2 MMC are rather contradictory, the optimization of laser surface alloying parameters for these composite coatings seems to be necessary. The characterization of the MMC was carried out by optical microscopy (OM), scanning electron microscopy (SEM/EDS) and x-ray diffraction (XRD). Partial melting of the alloying powder occurred and the chemical reactions with the a-Al in the matrix led to the formation of AlTi and AlB2 phases. Eutectics of TiB2/Al and TiB2/Ti were observed. The results of the tests indicate that TiB2 reinforcement does not give significant increase in microhardness of aluminium. The corrosion resistance of a single laser trackline MMC in a 3.65 % NaCl solution was improved, especially for the sample produced at high scan speed, with the lowest volume fraction of TiB2 particles.

12

Laser surface alloying of sintered stainless steels with SiC powder

Brytan Z., Dobrzański L. A., Pakieła W.

Journal of Achievements in Materials and Manufacturing Engineering

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2011

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Vol. 47, nr 1

42--56

EN

Purpose: The goal of this study is to investigate effects of laser surface alloying with SiC powder on microstructural changes and properties of vacuum sintered austenitic X2CrNiMo17-12-2, ferritic X6Cr13 and duplex X2CrNiMo22-8-2 stainless steels. Design/methodology/approach: Surface modification of sintered stainless steels was carried out by laser surface alloying with SiC powder using high power diode laser (HPDL). The influence of laser alloying conditions, the laser beam power (between 0.7 and 2.1 kW) at constant scanning rate on the width of alloyed surface layer and penetration depth were studied. The resulting microstructure in laser alloyed surface layer was examined using light and scanning electron microscopy. Phase composition was determined by the X-ray diffraction method. The microhardness results of modified surface layer were also studied. Findings: The alloyed surface layer has a fine dendritic microstructure with iron-chromium carbides precipitations. The surface layer was enriched in silicon and carbon that produced microstructural changes and resulting microhardness increase. Beside studied stainless steels the duplex one revealed highest hardening effect by laser alloying with SiC powder, where related microhardness was about 500-600 HV Practical implications: Laser surface alloying with SiC powder can be an efficient method of surface layer hardening of sintered stainless steels and produce significant improvement of surface layer properties in terms of hardness and wear resistance. Originality/value: Application of high power diode laser can guarantee uniform heating of treated surface, thus uniform thermal cycle across processed area and uniform penetration depth of alloyed surface layer.

13

Sintered stainless steel surface alloyed with Si3N4 powder

Brytan Z., Dobrzański L., Pakieła W.

Archives of Materials Science and Engineering

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2011

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Vol. 50, nr 1

43-55

EN

Purpose: The goal of this study was to investigate effects of laser surface alloying with Si3N4 powder on the microstructural changes and properties of vacuum sintered stainless steels, both austenitic X2CrNi17-12-2, ferritic X6Cr13 and duplex X2CrNiMo22-8-2. Design/methodology/approach: High power diode laser (HPDL) was applied to surface modification of sintered stainless steels with Si3N4 powder. The influence of laser alloying conditions on the width, penetration depth of alloyed surface layer were studied and analysed via FEM simulation. The microstructure of alloyed layers was examined using light and scanning electron microscopy as well as X-ray diffraction. The microhardness and wear resistance of studied surface layers were also evaluated. Findings: The hardness increased with addition of Si3N4 due to strong solution hardening effect of nitrogen and silicon that dissolved in the steel matrix during laser alloying. The strong austenite stabilizer effect of nitrogen was observed in ferritic stainless steel that revealed duplex microstructure. The hardness increased with addition of Si3N4 due to strong solution hardening effect of nitrogen and silicon dissolved in the steel matrix during laser alloying. The hardening effect of Si3N4 was strongest in case of ferritic stainless steel where microhardness increased to 450 HV0.1 for 2.1 kW of laser beam power. The duplex stainless steel shows the regular microhardness on the whole penetration depth. Laser surface alloying with Si3N4 improved wear resistance of sintered stainless steels compared to not processed stainless steel as well as comparing layers prepared as machined grooves and surface with pre-coated paste. Practical implications: Laser surface alloying with Si3N4 powder can be an efficient method of surface layer hardening of sintered stainless steels and produce improvement of surface layer properties in terms of hardness and wear resistance. Moreover, application of high power diode laser HPDL and surface prepared as machined grooves can guarantee uniform heating of treated surface, thus uniform thermal cycle across processed area and uniform penetration depth of alloyed surface layer. Originality/value: Application of high power diode laser can guarantee uniform heating of treated surface, thus uniform thermal cycle across processed area and uniform penetration depth of alloyed surface layer.

14

Microstructure and properties of laser surface alloyed PM austenitic stainless steel

Brytan Z., Bonek M., Dobrzański L. A.

Journal of Achievements in Materials and Manufacturing Engineering

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2010

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Vol. 40, nr 1

70-78

EN

Purpose: The purpose of this paper is to analyse the effect of laser surface alloying with chromium on the microstructural changes and properties of vacuum sintered austenitic stainless steel type AISI 316L (EN 1.4404). Design/methodology/approach: Surface modification of AISI 316L sintered austenitic stainless steel was carried out by laser surface alloying with chromium powder using high power diode laser (HPDL). The influence of laser alloying conditions, both laser beam power (between 0.7 and 2.0 kW) and powder feed rate (1.0-4.5 g/min) at constant scanning rate of 0.5m/min on the width of alloyed surface layer, penetration depth, microstructure evaluated by LOM, SEM x-ray analysis, surface roughness and microhardness were presented. Findings: The microstructures of Cr laser alloyed surface consist of different zones, starting from the superficial zone rich in alloying powder particles embedded in the surface; these particles protrude from the surface and thus considerably increase the surface roughness. Next is alloyed zone enriched in alloying element where ferrite and austenite coexists. The following transient zone is located between properly alloyed material and the base metal and can be considered as a very narrow HAZ zone. The optimal microstructure homogeneity of Cr alloyed austenitic stainless steel was obtained for powder feed rate of 2.0 and 4.5 g/min and laser beam power of 1.4 kW and 2 kW. Practical implications: Laser surface alloying can be an efficient method of surface layer modification of sintered stainless steel and by this way the surface chromium enrichment can produce microstructural changes affecting mechanical properties. Originality/value: Application of high power diode laser can guarantee uniform heating of treated surface, thus uniform thermal cycle across treated area and uniform penetration depth of chromium alloyed surface layer.

15

Diode laser surface modification of Ti6Al4V alloy to improve erosion wear resistance

Lisiecki A., Klimpel A.

Archives of Materials Science and Engineering

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2008

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Vol. 32, nr 1

5-12

EN

Purpose: Purpose of this paper : The purpose of the study was to develop new laser alloying technology providing high erosion wear resistance of the working surfaces of blades made of titanium alloy Ti6Al4V. Design/methodology/approach: High power diode laser HPDL with a rectangular laser beam spot of multimode and uniform intensity of laser radiation was applied in the process of laser surface modification of the titanium alloy Ti6Al4V. During the laser surface remelting and alloying of the titanium alloy in argon and nitrogen atmospheres, surface layers of high hardness and significantly higher erosion wear resistant, compared with the base material of titanium alloy Ti6Al4V, were produced. Findings: The surface layers are composites of titanium nitrides participations in the titanium alloy matrix. Hardness of the surface layers and erosion wear resistance depends strongly on parameters of laser processing and on the partial pressure of nitrogen in the gas mixture of nitrogen-argon atmosphere. Research limitations/implications: The most critical parameter of the functional quality of titanium alloy blades of turbofan engine and steam turbines is the fatigue strength, therefore further investigations are required to determine the fatigue strength and also internal stresses in the nitrided surface layers. Practical implications: The novel technology of high power diode laser surface modification of the titanium alloy Ti6Al4V can be applied to produce erosion wear resistant and long lifetime surface layers of turbofan engine blades and steam turbine blades. Originality/value: The laser surface modification of titanium alloy by the high power diode laser with the rectangular laser beam spot of multimode and uniform intensity of laser radiation is very profitable in a case of laser surface remelting and alloying because the treated surface is heated uniformly, so uniform penetration depth and uniform thickness of the surface layer can be achieved, as opposed from circular laser beams of solid states YAG and gas lasers.

16

Diode laser gas nitriding of Ti6Al4V alloy

Lisiecki A., Klimpel A.

Archives of Materials Science and Engineering

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2008

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Vol. 31, nr 1

53-56

EN

Purpose: To produce erosion wear resistant and high hardness surface layers of turbofan engine blades and steam turbine blades made of titanium alloy Ti6Al4V laser gas nitrating (LGN) technology of laser alloying was selected to produce titanium nitrides participations in the titanium alloy matrix surface layers. Design/methodology/approach: Studies on influence of the parameters of laser gas nitriding of titanium alloy and partial pressure of nitrogen and argon in the gas mixture on the surface layers shape, penetration depth, microhardness, erosion wear resistance at different angles of erodent particles stream were conducted. The high power diode laser HPDL with a rectangular laser beam of even multimode intensity on the beam spot was applied in the laser gas nitriding process. Tests of erosion wear resistance were conducted according to the ASTM 76 standard at velocity of the erodent particles stream 70 [m/s], at angles 90 [°] and also 30 [°]. Findings: High quality surface layers of high hardness and erosion wear resistant were produced on the substrate of titanium alloy Ti6Al4V during Laser Gas Nitriding - LGN. Results of the study show that the erosion resistance of laser nitrided surface layers is significantly higher compared with the base material of titanium alloy Ti6Al4V, and depends strongly on the inclination angle of the erodent particles stream. Research limitations/implications: Further investigations of internal stresses in the nitrided surface layers and the fatigue strength of extremely hard surface layers are required, because the fatigue strength is decisive for the functional quality of the surface layers. Practical implications: The investigated technology of laser gas nitriding can be applied for increasing erosion wear resistance of surface layers of turbofan engine blades and steam turbine blades made of titanium alloy. Originality/value: Application of the rectangular diode laser beam spot of multimode and uniform intensity of laser radiation is very profitable in a case of laser surface remelting and alloying because it guarantees uniform heating of the treated surface, consequently uniform thermal cycle across the area of the beam interaction and also uniform penetration depth of the single bead of the surface layer.

17

Powierzchniowe laserowe wzbogacanie warstwy wierzchniej stali węglowej

Woldan A., Kusiński J.

Inżynieria Materiałowa

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2003

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R. XXIV, nr 6

585-588

PL

W referacie omówiono strukturę i własności warstwy wierzchniej (WW) stali węglowej (0,17%C) stopowanej tantalem. Zastosowano dwa rodzaje lepiszcza wiążącego proszek tantalu: nieorganiczne i organiczne. Uzyskano zmiany mikrostruktury w obszarze strefy wzbogaconej (SW), która składała się z martenzytu i węglików Ta2C. Otrzymana struktura oraz zastosowanie jako lepiszcza pokostu spowodowały zwiększenie twardości (do ok. 1800 mu HV65) i odporności na zużycie.

EN

The paper describes the microstructure and properties (chemical composition, microhardness and the effect of the tribological test of the surface laser alloyed layer with tantalum. Scanning electron microscopy examinations show structure, which consist of martensite and Ta2C carbides. Samples covered with Ta and the carbon containing binder showed after laser alloying higher hardness than in case of using silicon-containing binder.