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1
Content available remote Spawalność stali obrabianej termomechanicznie o wysokiej granicy plastyczności
100%
Górka J.
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2010
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tom R. 54, nr 5
165-169
PL
Przedstawiono sposób wytwarzania i własności stali obrabianych termomechanicznie. Przeprowadzono badania własności spoin oraz SWC stali S700MC o grubości 10 mm spawanej metodą GMA drutem litym Mn4Ni1,5CrMo o średnicy 1,0 mm. Przeprowadzona analiza składu chemicznego materiału rodzimego, stopiwa i spoiny wykazała wyraźne różnice w równoważniku węgla, co może wpływać na własności wytrzymałościowe i plastyczne złączy spawanych. Badania metalograficzne, rentgenowska analiza składu chemicznego oraz rentgenowska analiza fazowa wykazały niejednorodność strukturalną i chemiczną złączy spawanych ze stali S700 MC.
EN
It has been presented the manner of fabrication and properties of thermomechanical steels. It was carried out testing of weld metal and HAZ properties in 10 mm thick S7000MC steel, GMA welded with Mn4Ni 1,5CrMo solid wire, 1,0 mm in diameter. The analysis of the parent material, deposited metal and weld metal has shown clear differences in carbon equivalent what can affect mechanical and plastic properties of welded joints. Metallographic examination, X-ray chemical composition analysis and X-ray phase analysis have revealed structural and chemical heterogeneity of S700MC steel welded joints.
2
Content available Effect of Relative Thickness Reduction and Heat Treatment on AMS 5596 Sheet Mechanical Properties After Flow Forming
100%
Kut S. , Maj P. , Mrugała T.
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3
Hydrogen embrittlement in low carbon steel
84%
Siddiqui R. A. , Abdul-Wahab S. A. , Pervez T. , Qamar S. Z.
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2007
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tom Vol. 28, nr 1-4
136-142
EN
Many metals and alloys absorb hydrogen and diffusion of hydrogen under certain conditions can seriously weaken and produces embrittlement in steel. Hydrogen embrittlement is a type of metal deterioration that is related to stress corrosion cracking. Although steels are well known for their susceptibility to hydrogen embrittlement, the mechanism of transportation of hydrogen is not very clear in low carbon steels. Standard tensile steel specimens were hydrogenated from 1 to 5 hours and deformed by cold worked to 50%, 60%, 70% and 80% and were investigated for mechanical properties.
4
Content available remote Experimental investigation of effects of external loads on erosive wear
84%
Imrek H. , Bagci M. , Khalfan O. M.
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2009
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tom Vol. 32, nr 1
18-22
EN
Purpose: The purpose of the paper is to investigate effects of external loads on erosive wear. Design/methodology/approach: In this experimental study, specimens were placed on specially designed a specimen holder and then, external tensile loads corresponding to 0%, 20%, 40% and 60% of the specimen’s yield strength were applied on the specimens. For every load step, the specimens were subjected to 15ş, 30ş, 45ş, 60ş, 75ş and 90ş of erodent impact angles. At the end of the tests, effects of external loads and impingement angles on erosive wear were studied. In the experimental set, dry and compressed air was used to impinge erodents onto the test specimens and subsequent wear was investigated. During the tests, the impingement angles were adjusted by turning the specimen holder around its axis. Erodent particles used were SAE G40 having internal uniform martensitic structure and angular geometry. Determination of erodents speed was achieved with the help of the Rotating Double Disc Method. The speed used in the tests was 30 m/s. Findings: At the end of the tests, erosive wear rates were obtained as functions of stresses and impingement angles. Graphs showing variations of erosive wear rates for load values obtained against every impingement angle and yield stress were drawn. Critical impingement angle and load values at which maximum erosion rate was obtained were determined. Research limitations/implications: In researches made on erosive wears so far; there are only few studies dealing with the effects of external loads on the specimens subjected to erosive wear. By considering that stresses may affect the erosive wear, the stress state around contact area as well as material properties, this experimental study has thus, investigated likely effects of stresses on the erosive wear. With the help of the designed special specimen holder, the specimens were subjected to tensile stresses that are lower than the yield strength of the material and then the erosive wear was investigated. Originality/value: The investigations of effects of external loads on erosive wear.
5
Content available remote The effect of yield strength on inelastic buckling of reinforcing bars
84%
Korentz J.
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2010
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tom Vol. 14, nr 2
247-255
EN
The paper presents the results of numerical analyses of inelastic buckling of reinforcing bars of various geometrical parameters, made of steel of various values of yield strength. The results of the calculations demonstrate that the yield strength of the steel the bars are made of influences considerably the equilibrium path of the compressed bars within the range of post yielding deformations. Comparative diagrams of structural behaviour (loading paths) of thin-walled sections under investigation for different strain rates are presented. Some conclusions and remarks concerning the strain rate influence are derived.
6
Content available remote Computer simulation of working stress of heat treated steel specimen
84%
Smoljan B. , Iljkic D. , Smokvina Hanza S.
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2009
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tom Vol. 34, nr 2
152-156
EN
Purpose: In this paper, the prediction of working stress of quenched and tempered steel has been done. The working stress was characterized by yield strength and fracture toughness. The method of computer simulation of working stress was applied in workpiece of complex form. Design/methodology/approach: Hardness distribution of quenched and tempered workpiece of complex form was predicted by computer simulation of steel quenching using a finite volume method. The algorithm of estimation of yield strength and fracture toughness was based on steel hardness, HV. Yield strength and fracture toughness distributions have been predicted using the Hahn-Rosenfield approach. Findings:It can be concluded that working stress of quenched and tempered steel can be successfully predicted by proposed method. The further experimental investigations are needed for final verification of established model. Research limitations/implications: For efficient estimation of fracture toughness from hardness, additional data about microstructure are needed. Practical implications: Estimation of hardness distribution can be based on time, relevant for structure transformation, i.e., time of cooling from 800 to 500 şC (t8/5). The prediction of distribution of microstructure composition, yield strength, and fracture toughness, can be based on steel hardness. Originality/value: Hardness distribution is predicted by involving the results of simple experimental test, i.e., Jominy-test in numerical modelling of steel quenching.
7
Content available remote Computer simulation of mechanical properties of quenched and tempered steel specimen
67%
Smoljan B. , Iljkić D. , Tomašić N.
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2010
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tom Vol. 40, nr 2
155-159
EN
Purpose: The computer simulation of mechanical properties of quenched and tempered steel was investigated. The established method of computer simulation was applied in prediction of mechanical properties of workpiece with complex form. Design/methodology/approach: The method of computer simulation of mechanical properties of quenched and tempered steel was established by theoretical analysis of relevant properties which have influence on hardness of quenched and tempered steel, and by regression analysis based on experimental results. Findings: The new method of prediction of mechanical properties of quenched and tempered steel was established. Proposed method of computer simulation of mechanical properties of quenched and tempered steel is based on predicted steel hardness. Hardness distribution of quenched and tempered workpiece of complex form was predicted by computer simulation of steel quenching using a finite volume method. It was found out that mechanical properties of quenched and tempered steel can be successfully predicted by proposed method. Research limitations/implications: The investigation was done on carbon and low alloyed steel. The further experimental investigations are needed for final verification of established model. Practical implications: The established method could be applied in industrial practice. Originality/value: As-quenched hardness distribution is predicted by involving the results of simple Jominy-test in numerical modelling of steel quenching. Estimation of hardness distribution is based on time, relevant for structure transforma- tion, i.e., time of cooling from 800 to 500°C (t8/5). The distribution of mechanical properties in quenched and tempered steel workpiece is estimated based on as-quenched steel hardness, tempering temperature and Jominy-test results.
8
Content available remote Mechanical properties dependency of the pearlite content of ductile irons
67%
Gonzaga R. A. , Martinez Landa P. , Perez A. , Villaneuva P.
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2009
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tom Vol. 33, nr 2
150-158
EN
Purpose: In this work, it is pretended to make a comparison of different pearlite contents in pieces with similar shape and dimensions and to analyze the variation of mechanical properties as pearlite content increases. The three pieces used had form of stair made of ductile cast iron. Design/methodology/approach: The present study was based on an adequate balance of alloying elements. None heat treatment was used to obtain different pearlite contents in the microstructures. Many specimens taken from the cast were mechanized to be polished and swabbed with nital to analyze the microstructure. To study the mechanical properties these casts present many tests were done such as Charpy impact test, done at different temperatures. Fracture toughness and tensile strength tests were done, as well. Findings: This study gave evidences that heat treatments are not necessary to obtain different pearlite content in the microstructure. Good mechanical properties are obtained by an appropriate balance of alloying elements. Research limitations/implications: They are that of natural sources. Besides, high and precision technology must be applied to get the present results better. Practical implications: Cast iron productions are focussed straight on machine building and automotive industries and constructions. The low cost production of ductile cast iron, its mechanical properties and low cost transformations are the tempting for application. Originality/value: The whole experimental work and the appropriate results obtained as consequences of the analysis carried out are novel, although applied methods are well known. Values presented in tables are given as new results of our experiments. This work is of great importance for the development of new economical methods for ductile iron production. This study is directed to researchers and metallurgy centres.
9
Content available remote Analysis of fracture mechanism in austenitic ductile iron with 30% Ni after impact test
67%
Putyra P. , Tabor A. , Zarębski K.
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2008
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tom Vol. 8, iss. 4
193-198
EN
The study presents the results of impact tests carried out on austenitic ductile iron with 30% Ni. The examined material was subjected to dynamic loads within a wide range of temperatures from (-196°C) to (+400°C). The fractures were examined under a JEOL JSM 6460LV scanning electron microscope. Additionally, microstructural examinations were carried out and chemical analysis in microregions was done by EDS.
10
Obróbka cieplno-chemiczna blach tłocznych.
59%
Kowalski S. , Łataś Z. , Obuchowicz Z. , Rogalski Z.
|
2002
|
tom R. XXIII, nr 5
285-288
PL
Próbki blachy o grubości 0,8 mm ze stali tłocznej zwykłej i stali tłocznej bez pierwiastków międzywęzłowych (IF) azotowano w złożu fluidalnym w czasie 2h w temperaturze 620 i 560 stopni Celsjusza, bez dalszego utleniania i z następnym utlenianiem oraz wolnym i szybkim chłodzeniem. W wyniku znacznie zwiększyła się twardość powierzchniowa, granica plastyczności i wytrzymałość na rozciąganie blach, bez nadmiernej utraty ciągliwości. Własności blachy ze stali bez pierwiastków międzywęzłowych poddanej badanym procesom były zdecydowanie lepsze, niż tak samo obrobionej blachy ze stali zwykłej.
EN
Specimens of 0.8 mm thick, made from regular and interstitial free (IF) drawing steel sheet have been nitrided in fluidized bed for 2 hours at 620 and 560 degrees centigrade, with and without a post-oxidation and with a slow and rapid cooling. As a result surface hardness, yield strength and tensile strength of the sheets increased considerably without a critical loss of ductility. Properties of interstitial free steel sheet which underwent the tested processes were definitely better than those of equally processed regular steel sheet.
11
Effect processing variables on mechanical properties of sintered manganese steels Fe-3%Mn-0.8%C.
51%
Sułowski M. , Ciaś A.
|
1998
|
tom R. XIX, nr 4
1179-1182
EN
The powder metallurgy route may allow sintered manganese steels to be made based on pure iron powder and ferromanganese powder with control over alloy microstructure. The factors that contribute to the mechanical properties of sintered Fe-3%Mn-0,8%C manganese steel, such as the sintering atmosphere, dew point, sintering temperature, cooling rate are summarized. The paper shows the influence of these parameters on the tensile strength, yield strength, transverse rupture strength, impact strength and hardness. It showed that tensile high strength level higher then those of many present sintered steels can be obtained already in the as-sintered condition.
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