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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
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
Volume720Pages:231-237
AbstractTwinning-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.
description.department[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
KeywordInduced Plasticity Steel Austenitic Steel Mechanical-properties Nanostructured Metal Tensile Ductility Trip/twip Steels Deformation Microstructure Evolution Cementite
Subject AreaNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationHundred 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]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79423
Collection中国科学院金属研究所
Corresponding AuthorZheng, 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.
Recommended Citation
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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