Comparison on Tensile Characteristics of Plain C–Mn Steel with Ultrafine Grained Ferrite/Cementite Microstructure and Coarse Grained Ferrite/Pearlite Microstructure |
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| Authors: | Yan Tian Mingchun Zhao Wenjian Liu Jimou Zhang Min Zhang Hongying Li Dengfeng Yin Andrej Atrens |
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| Affiliation: | 1.School of Materials Science and Engineering, Central South University, Changsha 410083, China; (Y.T.); (M.Z.); (W.L.); (H.L.);2.Xiangtan Iron & Steel Co., Ltd. of Hunan Valin, Xiangtan 411101, China;3.Hengyang Valin Steel Tube Co., Ltd., Hengyang 421001, China;4.School of Mechanical and Mining Engineering, University of Queensland, Brisbane, QLD 4072, Australia; |
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| Abstract: | This work investigated the tensile characteristics of plain C–Mn steel with an ultrafine grained ferrite/cementite (UGF/C) microstructure and coarse-grained ferrite/pearlite (CGF/P) microstructure. The tensile tests were performed at temperatures between 77 K and 323 K. The lower yield and the ultimate tensile strengths were significantly increased when the microstructure was changed from the CGF/P to the UGF/C microstructures, but the total elongation and the uniform elongation decreased. A microstructural change from the CGF/P microstructure to the UGF/C microstructure had an influence on the athermal component of the lower yield and the ultimate tensile strengths but not on the thermal component. The UGF/C microstructure with a higher carbon content provided a higher strength without losing ductility because cementite particles restrained necking. |
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| Keywords: | plain C– Mn steel, tensile property, strength, ductility, grain size |
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