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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; Ma, XL (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China.
2018-03-21
发表期刊MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
卷号720页码:231-237
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.
部门归属[xiong, t. ; zheng, s. j. ; zhou, y. t. ; pang, j. c. ; jin, q. q. ; ge, h. l. ; zheng, x. d. ; yang, l. x. ; ma, x. l.] chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, liaoning, peoples r china ; [xiong, t. ; ge, h. l. ; zheng, x. d.] univ sci & technol china, sch mat sci & engn, hefei 230026, anhui, peoples r china ; [beyerlein, i. j.] univ calif santa barbara, mat dept, mech engn dept, santa barbara, ca 93106 usa ; [ma, x. l.] lanzhou univ technol, sch mat sci & engn, lanzhou 730050, gansu, peoples r china
关键词Induced Plasticity Steel Austenitic Steel Mechanical-properties Nanostructured Metal Tensile Ductility Trip/twip Steels Deformation Microstructure Evolution Cementite
学科领域Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者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]
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/79423
专题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.
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