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| Effect of Strain Rate on Microstructure Evolution and Mechanical Property of 316LN Austenitic Stainless Steel at Cryogenic Temperature |
Huipeng LI1, Yi XIONG1,2( ), Yan LU1,2, Tiantian HE1, Meixiang FAN1, Fengzhang REN1,2 |
1 School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China 2 Collaborative Innovation Center of Nonferrous Metals, Henan Province, Luoyang 471023, China |
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Cite this article:
Huipeng LI, Yi XIONG, Yan LU, Tiantian HE, Meixiang FAN, Fengzhang REN. Effect of Strain Rate on Microstructure Evolution and Mechanical Property of 316LN Austenitic Stainless Steel at Cryogenic Temperature. Chinese Journal of Materials Research, 2018, 32(2): 105-111.
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Abstract The uniaxial tensile property of 316LN austenitic stainless steel (ASS) plate at -40 ℃was examined by strain rates of 5×10-4 s-1 and 1×10-2 s-1 respectively, while the microstructure evolution was characterized by means of OM, TEM, SEM, XRD and 3D profile profiler. The results showed that the deformation induced martensite transformation occurred in 316LN austenitic stainless steel at cryogenic temperature, and the martensite transformation decreased with the increase of strain rate. The yield strength increased with the increase of strain rate, while the tensile strength and elongation decreased with the increase of strain rate. The tensile fractured surface showed typical ductile fracture. The deformed microstructure composed mainly of dislocation tangles and T-M(twin-matrix)lamellar structures. With the increase of strain rate, the dislocation tangles aggravated and the interlamellar spacing of T-M(twin-matrix)lamellar structures reduced.
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Received: 31 March 2017
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| Fund: Supported by National Natural Science Foundation of China (No. 51201061), and Program for Science, Technology Innovation Talents in Universities of Henan Province (No. 17HASTIT026), Science and Technology Project of Henan Province (No. 152102210077), Henan International Scientific and Technological Cooperation Project (No. 172102410032), Education Department of Henan Province (No. 16A430005) and Science and Technology Innovation Team of Henan University of Science and Technology (No. 2015XTD006) |
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