Microscopic residual stress evolution in an austenite (γ) grain during a shape-memory process in an Fe-Mn-Si-Cr alloy was investigated using the white X-ray microbeam diffraction technique. The stresses were measured on a coarse grain, which had an orientation near <144>, parallel to the tensile loading direction with a high Schmid factor for a martensitic transformation. The magnitude of the residual stresses in a grain of the sample, which was subjected to a 23 % tensile strain and subsequent shape-recovery heating, was found to be very small and comparable to that prior to tensile deformation. Measurements of the recovery strain and microstructural analyses using electron backscatter diffraction suggested that the low residual stresses could be attributed to the significant shape recovery caused by a highly reversible martensitic transformation in the grain with a particular orientation.
|Journal||IOP Conference Series: Materials Science and Engineering|
|Publication status||Published - 2018 Jan 25|
|Event||15th European Workshop on Modern Developments and Applications in Microbeam Analysis, EMAS 2017 and 7th Meeting of the International Union of Microbeam Analysis Societies, IUMAS 2017 - Konstanz, Germany|
Duration: 2017 May 7 → 2017 May 11