Strain direction dependency of martensitic transformation in austenitic stainless steels: The effect of

Assessment of Martensitic Transformation Paths Based on Transformation Potential Calculations

“…However, a series of papers studying an SAE 304 stainless steel with electron backscatter diffraction (EBSD) showed minimal martensite in cube and Goss oriented grains . Orientation distribution functions (ODFs) of other austenitic steels have generally shown an increase in cube and Goss oriented grains after uniaxial deformation, also indicating that these orientations were not transforming . This increase in Goss and cube orientations is in contradiction to expected transformation potential results for a γ → α ’ transformation, such as made previously by the authors, which also predicted that grains with crystal axes aligned with the cube and Goss orientations would transform first.…”

“…Despite different assumptions on the nature of the transformation, comparison of the calculations shown in refs. for a uniaxial stress state and γ → α ’ transformation path result in similar transformation potential values for both the BCC and BCT crystallography.…”

“…These orientations are referred to in the text with their shorthand names given in Figure . For the deformation state of uniaxial tension along the rolling direction, transformation potential minima are predicted for copper and rotated brass orientations, indicating these orientations will transform last . Maxima were calculated for cube and Goss orientations, indicating these orientations would transform first for the same deformation state.…”

“…The variant that has the largest transformation potential value is the variant expected to appear. Therefore, the maximum transformation potential can be calculated as a function of crystal orientation and stress state to determine which variants will occur for a specific orientation. This technique assumes that the martensitic transformation is stress induced, although experimentally stress induced versus strain induced transformations may be difficult to separate .…”

Influence of Stresses on Magnetic B-H Characteristics of X30Cr13 Corrosion Resisting Martensitic Steel

“…Magnetoelastic-effect based non-destructive testing of corrosion resisting steels can be considered only for the martensitic steels, such as X30Cr13 steel. Austenitic steels are non-magnetic, however, under specified mechanical stresses austenite may be conversed to martensite [10,11,12]. This phenomenon is also very interesting from the non-destructive testing point of view, but its principle is different than magnetoelastic effect in martensitic steels.…”