02 Strain Induced Martensite 304L 316L

This study evaluates the effects of test parameters, specifically temperature and speed, on the formation of strain-induced martensite in metastable austenitic stainless steels (grades AISI 304L and AISI 316L). Conducting standardized tensile tests across temperature ranges from 10 °C to 35 °C and strain rates from 2.5 x 10^-4 to 3 x 10^-4 s^-1, the research measured the generation of martensitic phase due to plastic deformation as well as the α-martensite content related to the distance from the fracture zone. A significant relationship between test conditions and martensitic transformation was revealed, particularly in AISI 304L, with strength variations exceeding 200 MPa, which corresponds to approximately 30 percent change based on extremities of the tested parameters. In contrast, AISI 316L illustrated comparatively modest strength differences of up to 70 MPa, accounting for more than 10 percent variations. These insights contribute to a more comprehensive understanding of the mechanical behaviors of these austenitic stainless steels under standardized test conditions, enhancing their applicability in various industrial contexts.