Plastic deformation and fracture behaviors of nitrogen-alloyed austenitic stainless steels |
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Authors: | Songtao Wang Ke Yang Yiyin Shan Laifeng Li |
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Affiliation: | aInstitute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;bTechnical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, China |
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Abstract: | The plastic deformation and fracture behaviors of two nitrogen-alloyed austenitic stainless steels, 316LN and a high nitrogen steel (Fe–Cr–Mn–0.66% N), were investigated by tensile test and Charpy impact test in a temperature range from 77 to 293 K. The Fe–Cr–Mn–N steel showed ductile-to-brittle transition (DBT) behavior, but not for the 316LN steel. X-ray diffraction (XRD) confirmed that the strain-induced martensite occurred in the 316LN steel, but no such transformation in the Fe–Cr–Mn–N steel. Tensile tests showed that the temperature dependences of the yield strength for the two steels were almost the same. The ultimate tensile strength of the Fe–Cr–Mn–N steel displayed less significant temperature dependence than that of the 316LN steel. The strain-hardening exponent increased for the 316LN steel, but decreased for the Fe–Cr–Mn–N steel, with decreasing temperature. Based on the experimental results and the analyses, a modified scheme was proposed to explain the fracture behaviors of austenitic stainless steels. |
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Keywords: | Nitrogen-alloyed austenitic steels Ductile-to-brittle transition Strain-induced martensite Strain-hardening behaviors |
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