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Tensile Deformation Behavior and Phase Transformation in the Weld Coarse-Grained Heat-Affected Zone of Metastable High-Nitrogen Fe-18Cr-10Mn-N Stainless Steel |
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| Authors: | Joonoh Moon Tae-Ho Lee Seong-Jun Park Jae-il Jang Min-Ho Jang Heon-Young Ha Byoungchul Hwang |
| Affiliation: | 1. Ferrous Alloy Department, Advanced Metallic Materials Division, Korea Institute of Materials Science, Changwon, Gyeongnam, 642-831, Republic of Korea 2. Division of Material Science and Engineering, Hanyang University, Seoul, 133-791, Republic of Korea 3. Department of Materials Science and Engineering, University of Science and Technology, Yuseong-ku, Daejeon, 305-350, Republic of Korea 4. Department of Materials Science and Engineering, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul, 139-743, Republic of Korea |
| Abstract: | The tensile deformation behavior and phase transformation in the weld coarse-grained heat-affected zone (CGHAZ) of a metastable high-nitrogen austenitic stainless steel was explored through tensile tests, nanoindentation experiments, and transmission electron microscopy analysis. True stress–strain response during tensile test was found to be seriously affected by δ-ferrite fraction, which depends on peak temperature of the CGHAZs. The strain-induced martensitic transformation (SIMT) occurred in base steel, whereas the SIMT disappeared and deformation twinning occurred predominantly in the CGHAZs. The relationship among true stress–strain response, nanoindentation hardness, and deformed microstructures was carefully investigated and discussed in terms of changes of stacking fault energy. |
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