| 要約: | Austenitic stainless steel (ASS) alloys with low nickel and high manganese content exhibit low stacking fault energy (SFE), resulting in the metastability of the austenitic matrix, as well as Twinning-Induced Plasticity (TWIP) and Transformation-Induced Plasticity (TRIP) effects. Understanding the different behavior of these materials in distinct loads is crucial in guiding forming processes. In this work, through a comparison of experimental data from tensile and compression tests, hardness tests, Finite Element Method (FEM) simulations, X-Ray Diffraction (XRD) and Electron Backscatter Diffraction (EBSD) analyses, the influence of crystallographic orientation and friction on the anisotropy of an AISI 201LN ASS was evaluated. According to Schmid factor analyses, a slightly greater tendency for twinning is expected under compression, although, due to strain heterogeneity induced by friction, great discrepancies are observed between the measured values of transformed martensite from XRD and EBSD. The values obtained from XRD were lower under compression than under tension, whereas the EBSD measurements taken at the center of the specimens showed the opposite trend. FEM simulation results and hardness measurements indicated that distribution of stress and strain varied along the compression axis and at a stress triaxiality of -0.33 (axial compression), the strain-transformed martensite relationship is very similar to the one occurring at 0.33 (axial tension). In the estimated phase transformation map, the average transformed martensite fraction was consistent with the results obtained from X-ray measurements.
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