Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 862, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.144424
Keywords
316L stainless steel; Cryogenic pre -deformation; Deformation -induced martensitic transformation; Strain hardening
Ask authors/readers for more resources
The dynamic formation of alpha'-martensite has a significant influence on the mechanical behavior of 316L SS. Cryogenic pre-deformation can control the martensitic transformation, resulting in improved strength and ductility for the cryogenically-rolled 316L SS.
The dynamic formation of alpha '-martensite during mechanical loading is essential in achieving the desired me-chanical properties of the metastable austenitic stainless steels (SS). However, the effect of alpha '-martensitic transformation on the mechanical behavior of 316L SS is less explored due to the over stability of austenite at room temperature (RT). Here, a thermomechanical processing method of cryogenic pre-deformation is applied to tailor the deformation-induced martensitic transformation in 316L SS and the subsequent deformation behavior during mechanical testing at RT. Detailed characterizations reveal that the alpha '-martensite nucleated at the intersection of shear bands by cryogenic pre-deformation can continue to grow along the shear bands at RT. The cryogenically-rolled (CryoRolled) 316L SS exhibits an excellent combination of strength and ductility in com-parison with the conventional cold-rolled counterparts, due to the proper activation of alpha '-martensitic trans-formation. The CryoRolled-12% sample presents a true tensile strength of 1143 MPa and a true uniform elongation of 0.17; while similar level of true tensile strength (1135 MPa) is obtained at the expense of low uniform elongation (0.024) for the RT-rolled-50% sample. A mean-field micromechanical model is applied to analyze the influence of the dynamic formation of the strengthening alpha '-martensite on the strain hardening behavior.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available