The significance of phase reversion-induced nanograined/ultrafine-grained structure on the load-controlled deformation response and related mechanism in copper-bearing austenitic stainless steel

doi:10.1016/j.jmbbm.2020.103666

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	The significance of phase reversion-induced nanograined/ultrafine-grained structure on the load-controlled deformation response and related mechanism in copper-bearing austenitic stainless steel
	Hu, C. Y.2; Somani, M. C.1; Misra, R. D. K.2; Yang, C. G.3
刊名	JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
	2020-04-01
卷号	104 页码:9
关键词	Austenitic biomedical alloy Grain size Cu addition Activation volume
ISSN号	1751-6161
DOI	10.1016/j.jmbbm.2020.103666
通讯作者	Misra, R. D. K.(dmisra2@utep.edu)
英文摘要	The ingenious concept of phase reversion annealing involving cold deformation of parent austenite to straininduced martensite, followed by annealing was used to obtain nano-grained/ultrafine-grained (NG/UFG) structure in a Cu-bearing biomedical austenitic stainless steel resulting in high strength-high ductility combination. Having employed the concept effectively, the primary objective of this study is to critically analyze the interplay between the load-controlled deformation response, strain-rate sensitivity and deformation mechanism of NG/UFG austenitic stainless steel via nanoscale deformation experiments and compare with its coarse-grained (CG) counterpart. The study demonstrated that the strain-rate sensitivity of NG/UFG was similar to 1.5 times that of the CG structure. Post-mortem electron microscopy of plastic zone surrounding the indents indicated that the active deformation mechanism was nanoscale twinning with typical characteristics of a network of intersecting twins in the NG/UFG structure, while strain-induced martensite transformation was the effective deformation mechanism for the CG structure. The fracture morphology was also different for the two steels, essentially ductile in nature, and was characterized by striations marking the line-up of voids in NG/UFG steel and microvoid coalescence in CG counterpart. The differences in deformation mechanisms between the NG/UFG and CG structure are attributed to the austenite stability - strain energy relationship. Furthermore, the presence of similar to 3 wt % Cu in austenitic stainless steel had somewhat moderate effect on strain-rate sensitivity and activation volume at similar level of grain size in its Cu-free counterpart. Specifically, in the NG/UFG structure, the nanoscale twin density was noticeably higher in Cu-bearing austenitic stainless steel as compared to Cu-free counterpart, as Cu is known to increase the stacking fault energy.
资助项目	National Science Foundation, USA[DMR 1602080] ; Genome of Steel (Profi3)[311934]
WOS研究方向	Engineering ; Materials Science
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000525737000065
资助机构	National Science Foundation, USA ; Genome of Steel (Profi3)
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/138156]
专题	金属研究所_中国科学院金属研究所
通讯作者	Misra, R. D. K.
作者单位	1.Univ Oulu, Ctr Adv Steels Res, Mat & Mech Engn, FI-90014 Oulu, Finland 2.Univ Texas El Paso, Lab Excellence Adv Steel Res, Dept Met Mat & Biomed Engn, Mat Sci & Engn Program, 500 W Univ Ave, El Paso, TX 79968 USA 3.Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Hu, C. Y.,Somani, M. C.,Misra, R. D. K.,et al. The significance of phase reversion-induced nanograined/ultrafine-grained structure on the load-controlled deformation response and related mechanism in copper-bearing austenitic stainless steel[J]. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS,2020,104:9.
APA	Hu, C. Y.,Somani, M. C.,Misra, R. D. K.,&Yang, C. G..(2020).The significance of phase reversion-induced nanograined/ultrafine-grained structure on the load-controlled deformation response and related mechanism in copper-bearing austenitic stainless steel.JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS,104,9.
MLA	Hu, C. Y.,et al."The significance of phase reversion-induced nanograined/ultrafine-grained structure on the load-controlled deformation response and related mechanism in copper-bearing austenitic stainless steel".JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS 104(2020):9.