Wyniki wyszukiwania - Biblioteka Nauki

1

Mechanical and tribological properties of the laser alloyed surface coatings

100%

Dobrzański L. A. , Piec M. , Bonek M. , Jonda E. , Klimpel A.

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2007

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tom Vol. 20, nr 1-2

235-238

EN

Purpose: Improvement of surface properties of X38CrMoV5-3 is one of the goals set to the research institutions active in this paper. Design/methodology/approach: Remelting and alloying of surface layers were made using the HPDL high power diode laser Rofin DL 020 in the laser power range of 1.2-2.3 kW. Abrasion wear resistance tests were made in the metal-ceramic material arrangement (ASTM-G65), and also in the metal-metal one. Findings: All employed carbides cause hardness and microhardness increase of the surface layer of the investigated steel, and in most cases abrasion wear resistance increase. The investigations carried out indicate that the best mechanical properties are displayed by the surface layers of steel alloyed with carbides: TaC, NbC, and VC; whereas, the best tribological properties are displayed by surface layers allowed with vanadium carbide, compared to the conventionally heat treated steel. Improvement of mechanical properties and abrasion wear resistance grow with the increase of the laser power. Research limitations/implications: The material behavior for the HPDL processing has been found to be different from the other high-power lasers in the following aspects: fewer cracks and less spallation for surface glazing/sealing, more uniform melt/heating zones, smoother surface, better beam absorption for metallic materials, more consistent and repeatable. Practical implications: The research results indicate to the feasibility and purposefulness of the practical use of remelting and alloying with the tungsten carbide using the high power diode laser for manufacturing and regeneration of various tools from the X38CrMoV5-3 hot-work tool steel. Originality/value: Possibilities of increasing the functional properties of hot-work alloy tool steels by modification of their chemical composition additional of ceramic particles in a conventional way are very limited already.

2

Structure and properties of surface layer of hot work tool steels alloyed using high power diode laser (HPDL)

100%

Dobrzański L. A. , Jonda E. , Labisz K.

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2008

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tom Vol. 29, nr 3

102-109

EN

The lifetime of tools and parts of machines is related with properties of surface layer. Thus the surface layer and its properties are elements which are critical for lifetime of tools and parts of machines and also for lifetime of whole technical equipment. If the working surface of a tool or its part is exposed to rough friction, an intensive mass and volume loss occurs. In this case it is reasonable to produce a surface layer which is extremely wear resistant to avoid the mass and volume loss. In this paper the results of remelting and alloying laser parameters on the structure and properties of the surface layer of the X40CrMoV5-1 and 32CrMoV12-28 hot work tool steels, using the high power diode laser (HPDL) are presented. The effect was determined of the main alloying parameters on hardness, abrasive wear resistance and roughness. The hot work tool steels conventionally heat treated were used as reference material and the tantalum carbide was used as an alloying material. The remelted layers which were formed in the surface of investigated hot work tool steels were metallographically examined and analyzed using a hardness testing machine.

3

Laserowa modyfikacja jakości warstwy wierzchniej

100%

Chuchro M. , Ruszaj A. , Dziedzic J.

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2009

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tom R. 14, z. 1

69-81

PL

Efektywną metodą kształtowania właściwości warstwy wierzchniej jest oddziaływanie na powierzchnię wyrobu wiązką światła laserowego o odpowiednio dobranej gęstości mocy. Przedstawiono możliwości laserowej modyfikacji warstwy wierzchniej dzięki zastosowaniu hartowania, stopowania i napawania laserowego. Zaprezentowano stanowisko do napawania laserowego i modyfikacji warstwy wierzchniej, znajdujące się w Instytucie Zaawansowanych Technologii Wytwarzania w Krakowie. Stanowisko wyposażone jest w głowicę COAX9, która dostarcza wiązkę laserową, proszek metalu i gaz ochronny do obszaru obróbki.

EN

The effective method of surface layer properties controlling is treating the material by manipulated laser beam. Possibilities of surface layer quality modification by means of laser quenching, alloying and cladding have been presented. The laser system for laser cladding and alloying situated in The Institute of Advanced Manufacturing Technology was described. The work stand is equipped with COAX9 head, which delivers laser beam, the metal powder and protective gas into machined area.

4

Stopowanie żeliwa molibdenem dodawanym w postaci MoO3

100%

Małecki S. , Jarosz P. , Malinowski C.

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2010

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tom R. 55, nr 10

679-685

PL

W artykule przedstawiono wyniki badań nad wprowadzaniem molibdenu do żeliwa w postaci trójtlenku molibdenu. Zbadano wpływ różnych rodzajów lepiszcza stosowanego do sporządzania granul MoO3 oraz różnej jego ilości na końcowy efekt procesu stopowania. Określono stopień przejścia molibdenu z tlenku do żeliwa, a także udział reduktorów zawartych w żeliwie na proces redukcji tlenku molibdenu.

EN

In the article, the results of alloying MoO3 to the cast iron were presented. The influence of the different kinds of binders and its addition on final effect of alloying were examined. The degree of molybdenum transition and the participation of reducers in cast iron for the process of MoO3 reduction were determined.

5

HPDL laser alloying of heat treated Al-Si-Cu alloy

100%

Labisz K. , Tański T. , Dobrzański L.

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2012

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tom Vol. 54, nr 1

13-21

EN

Purpose: There are presented in this paper the investigation results of microstructure of the cast aluminium alloys in the as cast state as well after laser treatment used for alloying with carbide and oxide ceramic powders like aluminium oxide and silicon carbide, titanium carbide, vanadium carbide and tungsten carbide. The purpose of this work was also to determine the laser treatment conditions for surface hardening of the investigation alloys, like laser power, as well the laser scan rate. Design/methodology/approach: The investigations were performed using light and electron microscopy for the microstructure determination. By mind of the transmission electron microscopy, especially selected area diffraction method appliance it was possible to determine the phases occurred in the alloy in the as cast state. The morphology and size of the Mg2Si was also possible to determine as well the lattice parameters for this phase. Findings: Concerning the laser treatment conditions for surface hardening the scan rat as well as the laser power influence was studied. It was used a power in the range between 1.0 and 2.0 kW The structure of the surface laser tray changes in a way, that there are very high roughness of the surface zone and the flatness or geometry changes in an important manner, crucial for further investigation. Research limitations/implications: The aluminium samples were examined metallographically using optical microscope with different image techniques as well as transmission electron microscope. Practical implications: Developing of new technology with appliance of Al alloys, High Power Diode Laser and diverse ceramic powders can be possible to obtain, based in findings from this research project. Some other investigation should be performed in the future, but the knowledge found in this research concerning the proper process parameters for each type of alloy shows an interesting investigation direction. Originality/value: The combination of metallographic investigation for cast aluminium alloys – including electron microscope investigation – and HPDL treatment parameters makes the investigation very attractive for automobile, aviation industry, and others where aluminium alloys plays an important role.

6

Podwyższenie trwałości stempli do szybkiego tłoczenia metodą laserowego utwardzania

100%

Blinkov V. , Sirotkin O. , Plichunov V. , Michalski J. , Wach P. , Nakonieczny A.

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2010

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tom Nr 4

64-70

7

Functional properties of surface layers of X38CrMoV5-3 hot work tool steel alloyed with HPDL laser

80%

Dobrzański L. A. , Piec M. , Labisz K. , Bonek M. , Klimpel A.

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2007

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tom Vol. 24, nr 2

191-194

EN

Purpose: Improvement of functional properties alloyed of hot work tool steel surface layers is one of the goals of this paper. Design/methodology/approach: The material used for investigation was the hot work tool steel X38CrMoV5-3. Remelting and alloying of surface layers were made using the HPDL high power diode laser Rofin DL 020 in the laser power range of 1.2-2.3 kW. The carbide powders were applied on specimens prepared and degreased in this way; the powder was mixed with the sodium glass as inorganic binder in proportion of 30% binder and 70% powder. Paste coating 0.5 mm thick was put down in each case. Findings: The hardness changes of the surface layers obtained by remelting and alloying with carbides using the high power diode laser are accompanied with the improved tribological properties compared to the conventionally heat treated steel. The highest abrasion wear resistance, more than 2.5 times higher than that of the base material, was revealed in case the steel alloyed with vanadium carbide. Research limitations/implications: These advantages are the result of features unique to the HPDL, such as: shorter wavelength (thus better beam absorption for most metallic materials, and smaller absorption length) and better temporal beam stability (due to beam integration) compared to Nd:YAG and CO2 lasers. HPDL materials processing is, therefore, expected to produce better quality and more consistent and repeatable results for applications requiring beam spot sizes larger than 0.5 mm diameter. One of the issues of concern in the practical applications of the lasers in materials processing for mass production is the repeatability. Practical implications: The research results indicate to the feasibility and purposefulness of the practical use of remelting and alloying with the ceramic particles using the high power diode laser for manufacturing and regeneration of various tools from the X38CrMoV5-3 hot-work tool steel. Originality/value: The laser treatment methods is still the most precise way to improve properties of the surface layers.

8

Mikrostrukturalne efekty wprowadzania Si, SiC i C podczas laserowego przetapiania warstwy wierzchniej stopu tytanu Ti-6Al-4V.

80%

Filip R. , Sieniawski J. , Pleszakow E.

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2002

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tom R. XXIII, nr 5

567-569

PL

W artykule przedstawiono wyniki badań warstw stopowanych laserowo na stopie tytanu Ti-6Al-4V pokrytym proszkiem Si, SiC i grafitem. Badania mikrostruktury prowadzono przy użyciu mikroskopu świetlnego i skaningowego wyposażonego w mikroanalizator rentgenowski. Skład fazowy określono metodą dyfraktometryczną a mikrotwardość metodą Vickersa. W warstwie przetopionej stwierdzono obecność wydzieleń faz SiC i TiC powstających w efekcie stopowania. Ich występowanie powodowało zwiększenie mikrotwardości w strefie przetopionej laserowo.

EN

The paper presents results of investigations of laser-alloyed layers on Ti-6Al-4V titanium alloy coated by Si, SiC and graphite powder. Microstructural analyses were carried out using optical and scanning electron microscope equipped with EDS X-ray detector for compositional analysis. The phases were identified by X-ray diffractometry and microhardness was measured using Vickers method. It was found that alloyed layers include TiC and SiC phases formed during laser treatment, which bring about microhardness increase.

9

Analiza pęknięcia zmęczeniowego stali stopowanej węglikiem chromu.

80%

Dudek A. , Nitkiewicz Z.

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2002

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tom R. XXIII, nr 5

520-522

PL

Proces stopowania polegający na przetopieniowym wprowadzeniu pierwiastków stopowych do warstwy wierzchniej, prowadzi między innymi do znacznego wzrostu własności wytrzymałościowych, jak między innymi twardości i odporności na ścieranie, kosztem obniżenia wytrzymałości na zmęczenie. W artykule przedstawiono sposób na polepszenie własności zmęczeniowych otrzymanych warstw poprzez ich kolejne ulepszenie cieplne.

EN

Modification of surface is a universal process commonly used for fulfilment of the requirements superimposed on steel surface layers by modern techniques. Alloying is one of several methods of surface treatment. This method is based on melting of the substrate surface and introducing additional material. The alloying process was performed using welding method (TIG). The experiments were done on 41Cr4-DIN EN (low alloy steel) which was alloyed with Cr3C2 chromium carbide powders.

10

Stopowanie żeliwa, staliwa i stali molibdenem dodawanym w postaci granul MoO3 z dodatkiem reduktora

80%

Małecki S. , Jarosz P. , Malinowski C. , Żaba K.

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2010

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tom R. 55, nr 10

686-689

PL

W artykule zaprezentowano wyniki badań nad wprowadzaniem molibdenu do stopów na osnowie żelaza. Molibden wprowadzano w postaci granul zawierających tlenek molibdenu i reduktor. W charakterze reduktorów stosowano żelazokrzem FeSi75 oraz silumin AlSi11. Uzyskano wysokie stopnie przechodzenia molibdenu do stopów bez istotnych zmian zawartości pozostałych składników. Skuteczność metody potwierdzono na próbkach o masie do 10 kg w warunkach laboratoryjnych.

EN

In this work, the results of alloying molybdenum to iron based alloys were presented. Molybdenum was alloyed as MoO3 granules with reducer. As reducers, ferrosilicon FeSi75 and silumin AlSi11 were used. High transition degrees of molybdenum without considerable changes of chemical composition of iron based alloys were obtained. The efficiency of the presented method was confirmed on a 10 kg samples in the laboratory.

11

Technologia naprawy uchwytów klapy dużej biernej silnika odrzutowego RD-33

80%

Klimpel A. , Rzeźnikiewicz A.

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2011

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tom R. 83, nr 9

43-49

PL

Badania uszkodzeń uchwytów klapy dużej biernej silnika wykazały, że naprawa tych elementów wymaga opracowania warunków technologicznych napawania automatycznego plazmowego PTA oraz napawania laserowego HPDL materiałami dodatkowymi zapewniającymi zwiększoną odporność na zużycie ścierne metal-metal, w stosunku do materiału podłoża. Wstępne próby napawania plazmowego PTA oraz napawania laserowego HPDL wykazały, że można uzyskać napoiny wysokiej jakości. Przez odpowiedni dobór parametrów napawania możliwe jest sterowanie wymiarami napoin oraz udziałem materiału podłoża w napoinie. Wykonano również badania odporności na zużycie ścierne połączenia metal-metal zgodnie z normą ASTM G99. Wyniki badań tribologicznych wykazały, że warstwa napawana laserowo z dodatkiem proszku 50%Ti-50%WC spełnia wszystkie warunki i jest prawie 124 razy bardziej odporna na zużycie ścierne typu metal-metal niż powierzchnia nieutwardzona.

EN

Tests of handles of large passive flap, showed that the repair of these elements requires the development of technological conditions of automatic plasma PTA surfacing and HDPL laser surfacing with filler materials ensuring increase resistance to wear of metal-metal, relative to the substrate material. Trial attempts of PTA plasma surfacing and HPDL laser surfacing showed that there is a range of parameters to obtain high-quality padding welds. By appropriate parameters it is possible to control the padding weld dimensions and the participation of substrate material in the padding weld. There is also carried out the wear resistance of metal-metal in accordance with ASTM G99 tests. Tribological test results showed that the layer made with the use of laser and powder, 50% Ti 50% WC meets the best conditions and is almost 124 times more resistant to metal-metal abrasive wear than the unhardened surface.

12

Umacnianie warstw wierzchnich stopowaniem udarowym.

70%

Babul T. , Babul W.

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2002

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tom R. XXIII, nr 5

604-607

PL

W pracy przedstawiono nowy kierunek wiedzy, obecnie intensywnie rozwijany, jakim jest umacnianie warstw wierzchnich przez wprowadzenie na duże głębokości cząstek innego materiału z prędkościami znacznie przewyższającymi prędkość dźwięku. Opisano niektóre typy akceleratorów, struktury i mechanizmy wnikania cząstek opartych na założeniu, iż wnikanie ich w podłoże na duże głębokości może dokonywać się tylko pod warunkiem wywoływania w podłożu specyficznego stanu energetycznie wysoko wzbudzonego, charakteryzującego się naruszeniem krystalicznej budowy materiału.

EN

The intended aim of the paper is to present a new line of knowledge and research under an intense development nowadays, i.e. the hardening of surface layers by means of introducing another material deep into the basis metal with a high-speed impact. What has been given consideration is accelerators, structures and mechanisms of penetration as based on the assumption that the penetration of particles deep into the basis metal can proceed provided that some specific, high excited energy state has been induced, namely the one featured with some disarrangement of crystal structure of the material.