The effects of retained austenite on dry sliding wear behavior of carburized steels

Kweon, Young-Gak

doi:10.1016/0043-1648(95)06634-9

Cited by 58 publications

(21 citation statements)

References 15 publications

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“…In contrast, the WC-12%Co coating shows opposite results. In general, hardness after wear is a result of a compromise between tempering and work hardening [18]. While tempering due to temperature increase during the wear proce~ gives decreases hardness, work hardening results in a hardness increase at: the worn surface.…”

Section: Heat Treatmentmentioning

confidence: 99%

Characterization of Fe-Cr-B based coatings produced by HVOF and PTA processes

Grossi

Kweon

1999

Metals and Materials

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Two Fe-Cr-B based gas atomized powders, Armacor M and 16, were thermally sprayed on a low carbon steel substrate, using the HVOF (High Velocity Oxygen Fuel) process. Armacor M was also weld-surfaced with the PTA (Plasma Transferred Arc) process. The resultant deposits were subsequently characterized, using X-ray diffraction, scanning electron microscopy, and microhardness measurement. The effects of heat treatment were also studied for HVOF-sprayed coatings. The wear performance of the coatings was investigated by two-body abrasive wear tests. The results of microstructural analysis of as-sprayed deposits revealed oxide and boride phases such as Fe304 and Crl.65Feo.35Bc~.~, in an ~ matrix for the HVOF-sprayed Armacor 16 coating, and only the boride phases (Cr1.65F%35B0.~6 and Cr~B) in an tx matrix for the HVOFsprayed Armacor M coating. PTA weld-surfaced Armacor M coating contains needle-type long precipitates of Cr~B and Crl.65Fe0.3~B~).9~, in the a matrix. The hardness of the HVOF-sprayed Armacor 16 coating after heat treatment was substantially less than that of the as-sprayed coating due to the phase transformation from tx to y phase. Heat treatments of the HVOF-sprayed Armacor M coating did not produce changes in phase and its hardness decreased as compared to that of the as-sprayed coating. While HVOF-sprayed and PTA weld-surfaced Armacor M coatings have the same hardness, the latter shows better abrasive wear resistance because of the size and orientation of its boride phases. The broadening of the XRD patterns and the increase in hardness after wear testing suggest that the transformation from the crystalline to the amorphous structure occurred on the uppermost layer during wear testing.

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Section: Heat Treatmentmentioning

confidence: 99%

Characterization of Fe-Cr-B based coatings produced by HVOF and PTA processes

Grossi

Kweon

1999

Metals and Materials

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“…The microstructures of steels were found to have obvious influences on the wear resistance (Ref [3][4][5][6][7][8][9][10]. Tyagi et al (Ref 3) reported that the wear resistance linearly increased with increasing the martensite amount.…”

Section: Introductionmentioning

confidence: 97%

Wear Characteristics and Mechanisms of H13 Steel with Various Tempered Structures

Cui

Wang

Wei

et al. 2010

J. of Materi Eng and Perform

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Wear tests of H13 steel with various tempering microstructures were performed under atmospheric conditions at room temperature (RT), 200°C, and 400°C. The wear characteristics and wear mechanisms of various tempered microstructures of the steel were focused by investigating the structure, morphology, and composition of the worn surfaces. Under atmospheric conditions at RT, 200°C, and 400°C, adhesive wear, mild oxidation wear, and oxidation wear prevailed, respectively. The wear rate at 200°C was substantially lower than those at RT and 400°C due to the protection of tribo-oxides. In mild oxidation wear, the tempered microstructures of the steel presented almost no obvious influence on the wear resistance. However, in adhesive wear and oxidation wear, the wear resistance strongly depended on the tempered microstructures of the steel. The steel tempered at 600-650°C presented pronouncedly lower wear rates than the one tempered at 200-550 or 700°C. It can be suggested that the wear resistance of the steel was closely related with its fracture resistance.

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“…Apesar de diversos estudos mostrarem que a austenita retida em níveis da ordem de 10-15% ser benéfica quanto a resistência à fadiga de componentes que operam sob carga tais como rolamentos e dentes de engrenagens [6], a transformação da austenita retida pode diminuir a resistência ao desgaste sob condições severas de uso. Estudo mostra que sob alta carga aplicada, o teor de até 30% de austenita retida reduz a resistência ao desgaste [7] A presença de austenita retida na microestrutura da camada cementada pode ser prejudicial a aços cementados tendo em vista a característica metaestável dessa fase. Um alto teor de carbono impede a transformação de toda austenita em martensita durante a têmpera, gerando assim uma porcentagem de austenita retida.…”

Section: Introductionunclassified

Efeito Do Tratamento Sub-Zero Em Mordentes Cementados

Badaró¹,

Reis²,

Macedo³

et al. 2018

ABM Proceedings

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ResumoMordentes são componentes que operam em severas condições de contato sob carga. Muitas vezes os mordentes são cementados a fim de melhorar o desempenho ao desgaste. Contudo, a cementação pode provocar a retenção de austenita, o que, dependendo da sua concentração, pode ser prejudicial nas condições de desgaste. Nesse estudo foram analisados mordentes usados na área de mineração, os quais sofreram severo desgaste em uso, diminuindo drasticamente a sua vida útil. O objetivo desse estudo é identificar o material e processos de fabricação do mordente além de propor alternativas para aumentar a vida útil. Foi feita a caracterização do material através de análise química, metalografias e ensaio de microdureza. Os resultados indicaram alta concentração de austenita retida, a qual foi a principal causa da perda de resistência ao desgaste do material. Com os resultados foi possível refazer o mordente com a aplicação do tratamento térmico sub zero, que garantiu aumento da vida útil em mais de dez vezes. Palavras-chave: Austenita retida; Mordente; Cementação. EFFECT OF SUB-ZERO TREATMENT ON CARBURIZED GRIP DIES AbstractGrip dies are components operating in rigorous load bearing conditions. Often the grips are carburized in order to improve wear performance. However the carburization can cause retained austenite which, depending on their concentration can be detrimental in terms of wear. In this study were analyzed grips used in mining, which suffered severe wear in use, and it drastically reduced its useful life. The aim of this study is to identify the material and the manufacturing processes of the grips. The material characterization was performed through chemical analysis, metallography and hardness test. The results indicated a high amount of retained austenite, which was the main cause of the wear of the material. From the results of this study, it was possible to remake the grip applying sub-zero heat treatment, which increased the grip life in over a ten-fold.

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The effects of retained austenite on dry sliding wear behavior of carburized steels

Cited by 58 publications

References 15 publications

Characterization of Fe-Cr-B based coatings produced by HVOF and PTA processes

Characterization of Fe-Cr-B based coatings produced by HVOF and PTA processes

Wear Characteristics and Mechanisms of H13 Steel with Various Tempered Structures

Efeito Do Tratamento Sub-Zero Em Mordentes Cementados

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