Abstract
Uniaxial tensile tests were conducted on AISI 316LN austenitic stainless steel from − 40 to 300 °C at a rate of 0.5 mm/min. Microstructure and mechanical properties of the deformed steel were investigated by optical, scanning and transmission electron microscopies, x-ray diffraction, and microhardness testing. The yield strength, ultimate tensile strength, elongation, and microhardness increase with the decrease in the test temperature. The tensile fracture morphology has the dimple rupture feature after low-temperature deformations and turns to a mixture of transgranular fracture and dimple fracture after high-temperature ones. The dominating deformation microstructure evolves from dislocation tangle/slip bands to large deformation twins/slip bands with temperature decrease. The deformation-induced martensite transformation can only be realized at low temperature, and its quantity increases with the decrease in the temperature.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China under Grants Nos. 50801021 and 51201061, and by the Program for Science, Technology Innovation Talents in Universities of Henan Province (17HASTIT026), the International Cooperation Project from Henan Province (172102410032), Science and Technology Project of Henan Province (152102210077), Education Department of Henan Province (16A430005) and the Science and Technology Innovation Team of Henan University of Science and Technology (2015XTD006). W. Cao acknowledges financial supports from Center for Advance Steel Research (CASR), University of Oulu.
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Xiong, Y., He, T., Lu, Y. et al. Tensile Deformation Temperature Impact on Microstructure and Mechanical Properties of AISI 316LN Austenitic Stainless Steel. J. of Materi Eng and Perform 27, 1232–1240 (2018). https://doi.org/10.1007/s11665-018-3234-9
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DOI: https://doi.org/10.1007/s11665-018-3234-9