Effect of carburizing grain size on the fatigue properties of carburizing steels.

Urita, Tatsumi; Namiki, Kunio; Iikubo, Tomohito

doi:10.4262/denkiseiko.59.33

Cited by 7 publications

(3 citation statements)

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“…Yuta IMANAMI, 1) * Takashi IWAMOTO 2) and Kimihiro NISHIMURA 3) 1) Steel Research Laboratory, JFE Steel Corporation, Kawasakidori 1-chome, Mizushima, Kurashiki-shi, Okayama, 712-8511 Japan.…”

Section: In-situ Observation Of Abnormal Grain Growth Of Austenite In Case Hardening Steelmentioning

confidence: 99%

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<i>In-situ</i> Observation of Abnormal Grain Growth of Austenite in Case Hardening Steel

Imanami¹,

Isobe²,

Nishimura

2021

ISIJ Int.

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Section: In-situ Observation Of Abnormal Grain Growth Of Austenite In Case Hardening Steelmentioning

confidence: 99%

“…During carburizing, abnormal grain growth of austenite (γ ) would occur due to higher temperature and longer holding time in the γ region. Because abnormal grain growth of γ causes a decrease in the toughness 1) and fatigue strength 2) of carburized parts, it is necessary to prevent the occurrence of abnormal grain growth.…”

Section: Introductionmentioning

confidence: 99%

<i>In-situ</i> Observation of Abnormal Grain Growth of Austenite in Case Hardening Steel

Imanami¹,

Isobe²,

Nishimura

2021

ISIJ Int.

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“…However, because it involves long-term heating in the austenite (hereinafter referred to as γ) region, abnormal grain growth of γ (secondary recrystallization) may occur. It is important to prevent abnormal grain growth of γ, as it is both a factor in lowering fatigue characteristics 1) and a factor in increasing heat treatment strain. Gladman proposed a critical condition formula 2) for abnormal grain growth based on the relationship between the driving force of grain growth and the pinning force exerted by precipitate particles.…”

Section: Introductionmentioning

confidence: 99%

Effect of Annealing Before Cold Forging on the Behavior of Abnormal Grain Growth during Carburizing

Imanami¹,

Yamashita²,

Tomita³

et al. 2017

ISIJ Int.

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Formation Mechanism of Coarse Austenite Grain during Hot Forging and Cooling in Case Hardening Steel

2020

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Abnormally coarse microstructure consisting of coarse pearlite and bainite has been sometimes observed in case hardening steels when they are slowly cooled after hot forging. In order to avoid this abnormal microstructure, it is of industrial importance to clarify its formation mechanism. In the present study, effects of hot deformation condition and cooling rate on the formation of austenite grain coarsening during cooling were investigated by a thermomechanical simulator for JIS SCM420 (0.20C-0.26Si-0.82Mn-1.03Cr-0.15Mo steel, in mass%). Coarse microstructures were observed when the specimen was deformed slightly at higher temperature after large deformation and subsequently cooled at slow cooling rate. In order to clarify the formation mechanism of coarse austenite grain, strain distribution (GOS: Grain Orientation Spread) in reconstructed austenite orientation map were analyzed for specimens quenched just after deformation. In the condition where coarse austenite formed, the GOS map made it clear that strain was introduced inhomogeneously grain by grain. This result suggested that abnormal austenite grain growth during slow cooling was induced by inhomogeneous strain distribution because growth of recrystallized grains (relatively low dislocation density) into work hardened grains (relatively high dislocation density) was driven by strain energy difference in addition to reduction of g rai n bou nd a r y area. Keywords: case hardening steel; h o t d e f o r m a t i o n ; continuous cooling; microstructure; grain growth; recrystallization; electron backscattering diffraction.

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Effect of carburizing grain size on the fatigue properties of carburizing steels.

Cited by 7 publications

References 0 publications

<i>In-situ</i> Observation of Abnormal Grain Growth of Austenite in Case Hardening Steel

<i>In-situ</i> Observation of Abnormal Grain Growth of Austenite in Case Hardening Steel

Effect of Annealing Before Cold Forging on the Behavior of Abnormal Grain Growth during Carburizing

Formation Mechanism of Coarse Austenite Grain during Hot Forging and Cooling in Case Hardening Steel

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