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LOW TEMPERATURE DEFORMATION BEHAVIOR OF HIGH–NITROGEN NICKEL–FREE AUSTENITIC STAINLESS STEELS |
XU Mingzhou, WANG Jianjun, LIU Chunming |
Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819 |
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Cite this article:
XU Mingzhou WANG Jianjun LIU Chunming. LOW TEMPERATURE DEFORMATION BEHAVIOR OF HIGH–NITROGEN NICKEL–FREE AUSTENITIC STAINLESS STEELS. Acta Metall Sin, 2011, 47(10): 1335-1341.
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Abstract The low–temperature deformation behaviors of two high–nitrogen nickel–free austenitic stainless steels (HNSs) with different N content were investigated by impact test, tensile test, XRD and TEM. The results indicate that HNS shows apparent ductile–to–brittle transformation (DBT) and work–hardening at low temperature. In the range of the experimental steels’ Mn content, the increase of Mn content improved the plasticity and the toughness at low temperature, and decreased the DBT temperature of HNS. Deformation–induced martensite transformation occurs in steel 18Cr–12Mn–0.55N during tensile deformation at low temperature, but the content of martensite is low and the decrease of temperature has no obvious effect on its formation. Deformation–induced martensite enhances the work–hardening ability but decreases the plasticity and toughness of HNS at low temperature. The decreases of work–hardening ability and stacking fault energy with temperature decreasing are the main reasons for brittle fracture of Fe–Cr–Mn HNS at low temperature.
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Received: 17 March 2011
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Fund: Supported by National Science and Technology Major Project of China (No.2009ZX04008–021) and Project of Department of Science and Technology of Liaoning Province (No.2007221007) |
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