Abstract:To clarify the effect of loading direction on the tensile properties of a TRIP-assisted duplex stainless steel sheet,the tensile deformation behavior of the test sheet at loading directions of 0°,45°and 90° with rolling direction (RD) were investigated by tensile test. Microstructural characteristics,especially the kinetics of strain-induced martensitic transformation (SIMT) were comparatively analyzed through EBSD,TEM,XRD,etc. The results showed that the tensile properties exhibited a strong anisotropy. The tensile strength and the ductility increased in the order of 0°,45°and 90°,but the yield strength was not sensitive to the loading direction. Microstructural analysis showed that the SIMT occurred in the metastable austenite which caused the transformation induced plasticity (TRIP) with a mechanisms of γ→ε→α'. Loading at the loading direction of 0° was in favor of TRIP,while the SIMT was suppressed at the loading direction of 90° due to the strain partitioning between austenite and ferrite. Moreover,the quantitative models of the kinetics of SIMT at different loading directions were established,respectively,whereby the content of strain-induced martensite at different deformation stages could be predicted.
马筱聪, 安子军, 陈雷, 梅瑞雪, 郝硕, 彭程. 加载方向对TRIP双相不锈钢板带拉伸性能的影响[J]. 钢铁, 2020, 55(2): 112-118.
MA Xiao-cong, AN Zi-jun, CHEN Lei, MEI Rui-xue, HAO Shuo, PENG Cheng. Influence of loading direction on tensile properties of a TRIP-assisted duplex stainless steel sheet. Iron and Steel, 2020, 55(2): 112-118.
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