Mechanism of subsurface microstructural fatigue crack initiation during high and very-high cycle fatigue of advanced bainitic steels

doi:10.1016/j.jmst.2021.08.060

IMECH-IR > 非线性力学国家重点实验室

	Mechanism of subsurface microstructural fatigue crack initiation during high and very-high cycle fatigue of advanced bainitic steels
	Gao, Guhui 1; Liu, Rong 1; Fan, Yusong 1; Qian GA(钱桂安)2 ; Gui, Xiaolu 1; Misra, RDK.3; Bai, Bingzhe 1,4
通讯作者	Gao, Guhui(gaogh@bjtu.edu.cn)
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2022-05-10
卷号	108 页码:142-157
ISSN	1005-0302
摘要	Advanced bainitic steels with the multiphase structure of bainitic ferrite, retained austenite and marten-site exhibit distinctive fatigue crack initiation behavior during high cycle fatigue/very high cycle fatigue (HCF/VHCF) regimes. The subsurface microstructural fatigue crack initiation, referred to as "non-inclusion induced crack initiation, NIICI", is a leading mode of failure of bainitic steels within the HCF/VHCF regimes. In this regard, there is currently a missing gap in the knowledge with respect to the cyclic response of multiphase structure during VHCF failure and the underlying mechanisms of fatigue crack initiation during VHCF. To address this aspect, we have developed a novel approach that explicitly identi-fies the knowledge gap through an examination of subsurface crack initiation and interaction with the lo -cal microstructure. This was accomplished by uniquely combining electron microscopy, three-dimensional confocal microscopy, focused ion beam, and transmission Kikuchi diffraction. Interestingly, the study indi-cated that there are multiple micro-mechanisms responsible for the NIICI failure of bainitic steels, includ-ing two scenarios of transgranular-crack-assisted NIICI and two scenarios of intergranular-crack-assisted NIICI, which resulted in the different distribution of fine grains in the crack initiation area. The fine grains were formed through fragmentation of bainitic ferrite lath caused by localized plastic deformation or via local continuous dynamic recrystallization because of repeated interaction between slip bands and prior austenite grain boundaries. The formation of fine grains assisted the advancement of small cracks. An-other important aspect discussed is the role of retained austenite (RA) during cyclic loading, on crack ini-tiation and propagation in terms of the morphology, distribution and stability of RA, which determined the development of localized cyclic plastic deformation in multiphase structure. (c) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
关键词	Microstructure Advanced bainitic steels Very high cycle fatigue Mechanism Retained austenite
DOI	10.1016/j.jmst.2021.08.060
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000787754200005
关键词[WOS]	DUPLEX STAINLESS-STEEL ; OPEN-SOURCE SOFTWARE ; FINE GRANULAR AREA ; DYNAMIC RECRYSTALLIZATION ; PLASTIC-DEFORMATION ; BEHAVIOR ; ALLOY ; INCLUSIONS ; CRYSTALLOGRAPHY ; TRANSFORMATION
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助项目	National Key Technologies Research and Development Program of China[2017YFB0304500] ; National Natural Science Foundation of China[51771014] ; National Natural Science Foundation of China[U1834202]
项目资助者	National Key Technologies Research and Development Program of China ; National Natural Science Foundation of China
论文分区	一类
力学所作者排名	3+
RpAuthor	Gao, Guhui
引用统计	被引频次：38[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/89022
专题	非线性力学国家重点实验室
作者单位	1.Beijing Jiaotong Univ, Sch Mech Elect & Control Engn, Mat Sci & Engn Res Ctr, Beijing 100044, Peoples R China; 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China; 3.Univ Texas El Paso, Lab Excellence Adv Steel Res, Dept Met Mat & Biomed Engn, 500W Univ Ave, El Paso, TX 79968 USA; 4.Tsinghua Univ, Sch Mat Sci & Engn, Key Lab Adv Mat, Beijing 100084, Peoples R China
推荐引用方式 GB/T 7714	Gao, Guhui,Liu, Rong,Fan, Yusong,et al. Mechanism of subsurface microstructural fatigue crack initiation during high and very-high cycle fatigue of advanced bainitic steels[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2022,108:142-157.
APA	Gao, Guhui.,Liu, Rong.,Fan, Yusong.,钱桂安.,Gui, Xiaolu.,...&Bai, Bingzhe.(2022).Mechanism of subsurface microstructural fatigue crack initiation during high and very-high cycle fatigue of advanced bainitic steels.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,108,142-157.
MLA	Gao, Guhui,et al."Mechanism of subsurface microstructural fatigue crack initiation during high and very-high cycle fatigue of advanced bainitic steels".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 108(2022):142-157.

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