Enhancing strength and thermal stability of TWIP steels with a heterogeneous structure

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	Enhancing strength and thermal stability of TWIP steels with a heterogeneous structure
	Xiong, T; Zheng, SJ; Zhou, YT; Pang, JC; Jin, QQ; Ge, HL; Zheng, XD; Yang, LX; Beyerlein, IJ; Ma, XL
刊名	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
	2018-03-21
卷号	720 页码:231-237
关键词	Induced Plasticity Steel Austenitic Steel Mechanical-properties Nanostructured Metal Tensile Ductility Trip/twip Steels Deformation Microstructure Evolution Cementite
ISSN号	0921-5093
英文摘要	Twinning-induced plasticity (TWIP) steels can exhibit high ultimate strength and ductility, but low yield strength and thermal stability. Here we approach this problem by introducing a heterogeneous microstructure comprised of soft, hard and thermally stable regions in a model composition of Fe-22Mn-0.6 C TWIP steel. This target microstructure is achieved via a three-step processing route: cold rolling to introduce nanotwin bundles, an aging treatment to transform highly defective regions to thermally stable pearlite nano-lamellae, and an annealing step for relatively large, ductile grains. We show that this microstructure generates a good balance between high yield strength, good ductility, high ultimate tensile strength, and good thermal stability. The main deformation mechanism of this unique heterogeneous structure is deformation twinning. The high thermal stability can be attributed to the transformation of the shear bands, introduced by cold rolling, into pearlite during the aging process, and into the composite of nanograined austenite and nanograined cementite formed during the subsequent isothermal annealing.; Twinning-induced plasticity (TWIP) steels can exhibit high ultimate strength and ductility, but low yield strength and thermal stability. Here we approach this problem by introducing a heterogeneous microstructure comprised of soft, hard and thermally stable regions in a model composition of Fe-22Mn-0.6 C TWIP steel. This target microstructure is achieved via a three-step processing route: cold rolling to introduce nanotwin bundles, an aging treatment to transform highly defective regions to thermally stable pearlite nano-lamellae, and an annealing step for relatively large, ductile grains. We show that this microstructure generates a good balance between high yield strength, good ductility, high ultimate tensile strength, and good thermal stability. The main deformation mechanism of this unique heterogeneous structure is deformation twinning. The high thermal stability can be attributed to the transformation of the shear bands, introduced by cold rolling, into pearlite during the aging process, and into the composite of nanograined austenite and nanograined cementite formed during the subsequent isothermal annealing.
学科主题	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
资助机构	Hundred Talents Project of Chinese Academy of Sciences; "Thousand Youth Talents Plan" of China; National Natural Science Foundation of China [51401208, 51771201]; Shenyang National Laboratory for Materials Science [2015RP18, 2017RP17]; National Science Foundation [NSF CMMI-1729887]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79423]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zheng, SJ; Ma, XL (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Xiong, T,Zheng, SJ,Zhou, YT,et al. Enhancing strength and thermal stability of TWIP steels with a heterogeneous structure[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2018,720:231-237.
APA	Xiong, T.,Zheng, SJ.,Zhou, YT.,Pang, JC.,Jin, QQ.,...&Ma, XL .(2018).Enhancing strength and thermal stability of TWIP steels with a heterogeneous structure.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,720,231-237.
MLA	Xiong, T,et al."Enhancing strength and thermal stability of TWIP steels with a heterogeneous structure".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 720(2018):231-237.