Abstract
The present work is the first comprehensive investigation of the cryogenic behaviour of dual-phase SS301 stainless steel over an extensive temperature range, including 20 K, 30 K, 40 K, 77 K, 120 K, 150 K, 170 K, and 300 K. The range of temperature involved in this study renders critical insights on the temperature sensitivity of the mechanical properties of SS301, such as yield strength, and ultimate tensile strength. This work notably unravels that the ductility and toughness of dual-phase SS301 remain largely unchanged between cryogenic and room temperatures owing to the similar level strain-induced transformation of martensite, and the resulting comparable phase-fractions. Furthermore, in addition to the two-stage serrations which are generally observed in discontinuous plastic-deformation, the present investigation reveals that the yield at 40 K accommodates four-stage serrations. However, interestingly, the four-stage of the serrations at 40 K progressively transition into two-stages as the deformation proceeds. Ultimately, the current work elucidates the mechanical behavior of dual-phase SS301 at cryogenic temperatures, in contrast to the more commonly analyzed austenitic stainless steels.
Published Version
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