Deformation compatibility between nanotwinned and recrystallized grains enhances resistance to interface cracking in cyclic loaded stainless steel

doi:10.1016/j.actamat.2018.11.033

CORC > 金属研究所 > 中国科学院金属研究所

	Deformation compatibility between nanotwinned and recrystallized grains enhances resistance to interface cracking in cyclic loaded stainless steel
	Li, Q.2,3; Yan, F. K.1,2; Tao, N. R.2; Ponge, D.1; Raabe, D.1; Lu, K.2
刊名	ACTA MATERIALIA
	2019-02-15
卷号	165 页码:87-98
关键词	Nanotwins Fatigue Interface crack Cyclic deformation Austenitic steel
ISSN号	1359-6454
DOI	10.1016/j.actamat.2018.11.033
通讯作者	Yan, F. K.(fkyan@imr.ac.cn) ; Tao, N. R.(nrtao@imr.ac.cn)
英文摘要	Cracks often initiate at phase boundaries in conventional second phase reinforced alloys during cyclic loading, which limits their fatigue properties. Here, we prepared a nanotwin strengthened 316L stainless steel consisting of nanotwinned and recrystallized grains by using plastic deformation and subsequent partial recrystallization annealing. Fatigue tests revealed that interfaces separating hard nanotwinned grains from soft recrystallized ones exhibited excellent resistance to crack initiation. More than half of the cracks (57% in number fraction) are found in recrystallized grains while a small fraction (11%) is observed at the interfaces between nanotwinned and recrystallized grains. This is ascribed to the elastic homogeneity and cyclic deformation compatibility between nanotwinned and recrystallized grains. At small cumulative cyclic strains (below 4000 cycles at sigma(a) = 450 MPa), nanotwinned grains deform compatibly with the recrystallized grains without noticeable strain localization at their interfaces. Nanotwins can accommodate cyclic plastic strains by interaction of dislocations with twin boundaries, especially through the motion of the well-ordered threading dislocations inside the twin lamellae. At large cumulative strains, a moderate strain gradient is developed in recrystallized grains surrounding nanotwinned grains as a function of distance from the interfaces due to the occurrence of localized deformation in nanotwinned grains. The nanotwinned grains show high microstructural stability without notable de-twinnning, thus retarding crack initiation and propagation. Therefore, improved fatigue property with high fatigue limit of similar to 350 MPa and high fatigue ratio of similar to 0.45 is achieved in the nanotwin strengthened stainless steel, which is better than that of conventional second phase reinforced steels with comparable strength. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
资助项目	National Natural Science Foundation of China[51501191] ; National Natural Science Foundation of China[51771196] ; National Natural Science Foundation of China[U1730140] ; National Key R&D Program of China[2017YFA0204401] ; National Key R&D Program of China[2017YFA0204402] ; Key Research Program of Frontier Science, Chinese Academy of Sciences ; Alexander von Humboldt Foundation
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000457665100008
资助机构	National Natural Science Foundation of China ; National Key R&D Program of China ; Key Research Program of Frontier Science, Chinese Academy of Sciences ; Alexander von Humboldt Foundation
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/131658]
专题	金属研究所_中国科学院金属研究所
通讯作者	Yan, F. K.; Tao, N. R.
作者单位	1.Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany 2.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Wenhua Rd 72, Shenyang 110016, Liaoning, Peoples R China 3.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China
推荐引用方式 GB/T 7714	Li, Q.,Yan, F. K.,Tao, N. R.,et al. Deformation compatibility between nanotwinned and recrystallized grains enhances resistance to interface cracking in cyclic loaded stainless steel[J]. ACTA MATERIALIA,2019,165:87-98.
APA	Li, Q.,Yan, F. K.,Tao, N. R.,Ponge, D.,Raabe, D.,&Lu, K..(2019).Deformation compatibility between nanotwinned and recrystallized grains enhances resistance to interface cracking in cyclic loaded stainless steel.ACTA MATERIALIA,165,87-98.
MLA	Li, Q.,et al."Deformation compatibility between nanotwinned and recrystallized grains enhances resistance to interface cracking in cyclic loaded stainless steel".ACTA MATERIALIA 165(2019):87-98.