Effect of retained austenite – Compressive residual stresses on rolling contact fatigue life of carburized AISI 8620 steel

Shen, Yi; Moghadam, Sina Mobasher; Sadeghi, Farshid; Paulson, Kristin; Trice, Rodney W.

doi:10.1016/j.ijfatigue.2015.02.017

Cited by 110 publications

(49 citation statements)

References 33 publications

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“…[25][26][27][28][29][30][31][32] The relationship between the maximum Vickers hardness and the maximum volume fraction of strain-induced martensite in the TM and SNCM420 steels is shown in Fig. 6(a).…”

Section: Maximum Vickers Hardness In the Surface-hardened Layermentioning

confidence: 99%

“…[26][27][28][29][30] This compressive residual stress is believed to result from the following effects: (i) Unrelaxed strain between the matrix and second phase because of severe plastic deformation; 2,[35][36][37][38][39] (ii) Expansion strain because of the strain-induced martensite transformation of the retained austenite. [25][26][27][28][29][30][31][32] According to the previous works, 35,40) if transformation strain of the martensite islands is assumed to be an isotropic expansion, the transformation strain (e M * ) of the Fe-(0.19-1.01) %C steels at martensite-start temperature is given by: (2) where %C is carbon concentration in the martensite. Natori et al 25) proposed that residual stress resulting from the strain-induced martensitic transformation (Δσ Xα,t ) can be calculated using Eq.…”

Section: Maximum Compressive Residual Stress In Thementioning

confidence: 99%

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Surface-hardened Layer Properties of Newly Developed Case-hardening Steel

2018

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The effects of fine-particle peening conditions on the surface-hardened layer properties of newly developed case-hardening steel, i.e., transformation-induced plasticity-aided steel with a chemical composition of 0.2% C, 1.5% Si, 1.5% Mn, 1.0% Cr, 0.2% Mo, and 0.05% Nb (mass%) were investigated for the fabrication of automotive drivetrain components. The surface roughness decreased with decreasing archeight of fine-particle peening after vacuum carburization. A white layer developed on the surface of the steel peened at arc-heights greater than 0.41 mm (N). The maximum Vickers hardness and maximum compressive residual stress increased with increasing arc-height in the steel. These values were higher than those of commercial case-hardening steels. The increased volume fraction and expansion strain of the strain-induced martensite increased the hardness and compressive residual stress in the surfacehardened layer of the steel, although severe plastic deformation made a substantial contribution to enhancing the surface-hardened layer properties.

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Section: Maximum Vickers Hardness In the Surface-hardened Layermentioning

confidence: 99%

Section: Maximum Compressive Residual Stress In Thementioning

confidence: 99%

Surface-hardened Layer Properties of Newly Developed Case-hardening Steel

2018

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“… τ r and m are material specific parameters established from torsional fatigue experimentation. This modified damage law has been implemented in multiple RCF modeling procedures . Equations and can be used to calculate the energy dissipation in the material microstructure as a function of stress cycles.…”

Section: Damage Accumulationmentioning

confidence: 99%

A novel approach for modeling retained austenite transformations during rolling contact fatigue

Sadeghi

Chen

Wang

et al. 2017

Fatigue Fract Eng Mat Struct

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Retained austenite (RA) transformation in martensitic steels subjected to rolling contact fatigue (RCF) is a well‐established phenomenon. In this investigation, a novel approach is developed to predict martensitic transformations of RA in steels subjected to RCF. In order to achieve the objectives, a 2‐dimensional finite element model was developed to determine subsurface stresses due to rolling contact. These stresses are utilized within a continuum damage mechanics framework to determine RA transformations as a function of depth and cycles. Phase transformations were determined by comparing the required thermodynamic driving force for transformations to the energy dissipation of the microstructure. The results obtained from the combined FEA and continuum damage mechanics model were corroborated to the experimental results for RA decomposition as a function of depth and cycle for SAE 52100 steel. The results obtained are in good agreement with observed RA decomposition and DER formation as compared with the experimental results.

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“…A austenita retida na camada cementada é uma fase dúctil, de aparência branca quando vista em microscópio ótico [4,5]. 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.…”

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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Effect of retained austenite – Compressive residual stresses on rolling contact fatigue life of carburized AISI 8620 steel

Cited by 110 publications

References 33 publications

Surface-hardened Layer Properties of Newly Developed Case-hardening Steel

Surface-hardened Layer Properties of Newly Developed Case-hardening Steel

A novel approach for modeling retained austenite transformations during rolling contact fatigue

Efeito Do Tratamento Sub-Zero Em Mordentes Cementados

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