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冷变形对高氮奥氏体不锈钢组织与力学行为的影响_图文


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ACTA METALLURGICA SINICA

Vol.43 No.7 July 2007 pp.713{718

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EFFECTS OF COLD DEFORMATION ON MICROSTRUCTURE AND MECHANICAL BEHAVIOR OF A HIGH NITROGEN AUSTENITIC STAINLESS STEEL
1) Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080 2) Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 3) Graduate University of Chinese Academy of Sciences, Beijing 100049 Manuscript received 2007{02{01, in revised form 2007{04{26

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WANG Songtao1 2 3) , YANG Ke2) , SHAN Yiyin2) , LI Laifeng1)

Correspondent: WANG Songtao, Tel: (024)23971835, E-mail: stwang@imr.ac.cn Supported by National Natural Sciences Foundation of China (No.50534010)

ABSTRACT The in uences of cold deformation on the microstructure and mechanical behavior for a high nitrogen austenitic stainless steel (1.2%N) were investigated through cold{rolling to di erent thickness reductions. No deformation{induced martensite was found in the steel even deformed up to 56%. It was found that the mechanical twins and dislocations slipping were the main deformation mechanism at the initial deformation stage, and the slipping was strongly obstructed by the twins. With increase of the deformation, the twins were split by slipping lines, and the twin boundaries were blurred. The strain{hardening exponent decreased with increase of the deformation. When the deformation reached to 56%, the yield strength and ultimate tensile strength were increased by about two times and one time, reached to 1654 MPa and 1870 MPa, respectively. By comparing the roles of nitrogen in several austenitic stainless steels, it was suggested that nitrogen obstructs the dislocations slipping and enhances the strain{hardening ability through the short range ordering. KEY WORDS high nitrogen steel, cold deformation, microstructure, mechanical property, stacking fault energy
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