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The deformation mechanisms of the metastable austenite phase of a transformation induced plasticity (TRIP) stainless steel, AISI 301LN, have been investigated by compression of multicrystalline micropillars of different crystallographic orientations, with particular attention on the strain-induced phase transformation from austenite to martensite. Intergranular shearing and twinning were observed to be the primary deformation mechanisms, with a predominant <122> orientation developed in the austenitic phase, combined with limited planar slip within single grains of austenite. The phase transformation from austenite to ¿ and ¿’-martensite was clearly observed adjacent to the sheared regions using TEM-EBSD techniques. The ¿-martensite phase was found to be preferentially located in the regions near the grain boundaries which experienced higher shear stresses during compression.
CitacióRoa, J.J., Wheeler, J.M., Trifonov, T., Fargas, G., Mateo, A., Michler, J., Jimenez-Pique, E. Deformation of polycrystalline TRIP stainless steel micropillars. "Materials science and engineering A. Structural materials properties microstructure and processing", 2015, vol. 647, p. 51-57.