Simultaneous improvement of tensile strength and ductility in micro-duplex structure consisting of austenite and ferrite

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Simultaneous improvement of tensile strength and ductility in micro-duplex structure consisting of austenite and ferrite
	Chen L(陈柳); Yuan FP(袁福平); Jiang P(姜萍); Xie JJ(谢季佳); Wu XL(武晓雷); Wu XL(武晓雷)
刊名	Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing
	2014
通讯作者邮箱	xlwu@imech.ac.cn
卷号	618 页码:563-571
关键词	Duplex stainless steel Equal channel angular pressing Strain hardening Modeling Phase boundary
ISSN号	0921-5093
通讯作者	武晓雷
产权排序	[Chen, L.; Yuan, F. P.; Jiang, P.; Xie, J. J.; Wu, X. L.] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
合作状况	国内
中文摘要	A micro-duplex structure consisting of austenite and ferrite was produced by equal channel angular pressing and subsequent intercritical annealing. As compared to coarse-grained (CG) counterpart, the strength and ductility of micro-duplex samples are enhanced simultaneously due to smaller grain sizes in both phases and more uniformly distributed austenite in ferrite matrix. The average yield stress and uniform elongation are increased to 540 MPa and 0.3 as compared to 403MPa and 0.26 of its CG counterpart respectively. The Hall–Petch coefficients of austenite and ferrite grain boundaries were quantitatively measured as 224.9 and 428.9 MPa μm^1/2 respectively. In addition, a Hall–Petch type coefficient was used to describe the ability of phase boundary to obstruct dislocation motion, which was measured as 309.7 MPa μm^1/2. Furthermore, the surface-to-volume ratio of phase boundary in micro-duplex structure was estimated to be 1.17×10⁶ m⁻¹, which is increased by an order of magnitude as compared to 1.2×10⁵ m⁻¹ of its CG counterpart. Based on the strain gradient theory, a model was proposed to describe the effect of surface-to-volume ratio of phase boundary on strain hardening rate, which shows a good agreement with the experimental results.
分类号	一类
收录类别	SCI ; EI
资助信息	The authors would like to thank the financial supports by 973 Program of China (Nos. 2012CB932203 and 2012CB937500) and NSFC (Grants nos. 51301187, 11222224, 11021262 and 11072243).
原文出处	http://www.sciencedirect.com/science/article/pii/S0921509314011198
语种	英语
WOS记录号	WOS:000344439500069
公开日期	2014-10-08
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/49115]
专题	力学研究所_非线性力学国家重点实验室
通讯作者	Wu XL(武晓雷)
推荐引用方式 GB/T 7714	Chen L,Yuan FP,Jiang P,et al. Simultaneous improvement of tensile strength and ductility in micro-duplex structure consisting of austenite and ferrite[J]. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing,2014,618:563-571.
APA	Chen L,Yuan FP,Jiang P,Xie JJ,Wu XL,&武晓雷.(2014).Simultaneous improvement of tensile strength and ductility in micro-duplex structure consisting of austenite and ferrite.Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing,618,563-571.
MLA	Chen L,et al."Simultaneous improvement of tensile strength and ductility in micro-duplex structure consisting of austenite and ferrite".Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing 618(2014):563-571.