Deformation mechanisms in an austenitic single-phase duplex microstructured steel with nanotwinned grains

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	Deformation mechanisms in an austenitic single-phase duplex microstructured steel with nanotwinned grains
	F. K. Yan; N. R. Tao; F. Archie; I. Gutierrez-Urrutia; D. Raabe; K. Lu
	2014
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	81 页码:487-500
摘要	A novel type of duplex microstructure is generated in a single-phase austenitic steel (AISI 316L; X2CrNiMo19-12), consisting of plastically compliant recrystallized austenitic grains as the matrix containing coarse non-recrystallized grains with a nanotwinned austenitic (nt-gamma) structure as strengthening inclusions. This novel type of single-phase yet duplex microstructured steel exhibits an excellent combination of strength and ductility. We study the plastic co-deformation mechanisms between the nanotwinned and the recrystallized grains under tension using electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). At tensile strains below 5%, the nt-gamma grains nearly deform homogeneously in conjunction with the surrounding statically recrystallized (SRX) grains without generating notable strain localization near their interfaces. The anisotropic plastic deformation of the nt-gamma grains with predominant shear parallel to the twin boundaries results in a higher dislocation density in the neighboring SRX grains. As the strain exceeds 12%, localized deformation occurs within the nt-gamma grains in the form of shear banding. A strain gradient is developed in the surrounding SRX grains as a function of distance from the nt-gamma/SRX interface. Deformation twinning is observed in the SRX grains near the nt-gamma grains, while away from nt-gamma grains dislocation slip dominates the deformation. The strengthening effect of the strong and ductile nt-gamma grains may offer a novel approach to strengthen austenitic steels and related alloys by generating a nanotwinned/recrystallized duplex microstructure. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[yan, f. k. ; tao, n. r. ; lu, k.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [archie, f. ; gutierrez-urrutia, i. ; raabe, d.] max planck inst eisenforsch gmbh, d-40237 dusseldorf, germany. [lu, k.] nanjing univ sci technol, herbert gleiter inst nanosci, nanjing 210094, jiangsu, peoples r china. ; lu, k (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. ; lu@imr.ac.cn
关键词	Nano-twinned Structures Austenitic Steels Plastic Deformation Mechanism Tem And Ebsd Characterization Dynamic Plastic-deformation Stainless-steel Dislocation Substructure Attrition Treatment Tensile Properties Twin Boundaries Strength Metals Copper Evolution
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语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73459
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	F. K. Yan,N. R. Tao,F. Archie,et al. Deformation mechanisms in an austenitic single-phase duplex microstructured steel with nanotwinned grains[J]. Acta Materialia,2014,81:487-500.
APA	F. K. Yan,N. R. Tao,F. Archie,I. Gutierrez-Urrutia,D. Raabe,&K. Lu.(2014).Deformation mechanisms in an austenitic single-phase duplex microstructured steel with nanotwinned grains.Acta Materialia,81,487-500.
MLA	F. K. Yan,et al."Deformation mechanisms in an austenitic single-phase duplex microstructured steel with nanotwinned grains".Acta Materialia 81(2014):487-500.