Premium
Effect of Work‐Hardening Mechanisms in Asymmetrically Cyclic‐Loaded Austenitic Stainless Steels on Low‐Cycle and High‐Cycle Fatigue Behavior
Author(s) -
Moshtaghi Masoud,
Safyari Mahdieh
Publication year - 2021
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.202000242
Subject(s) - materials science , martensite , austenite , metallurgy , hardening (computing) , work hardening , low cycle fatigue , fatigue testing , composite material , microstructure , layer (electronics)
Dislocation characteristics and deformation‐induced martensite (DIM) transformation in an asymmetrically cyclic‐loaded metastable type 304 stainless steel (SS) are investigated compared with a stable type 316SS using EBSD and X‐ray diffraction line‐profile analysis. In low‐cycle fatigue (LCF) regime, differences between dislocation densities of type 304SS and type 316SS are increased with decreasing fatigue life, and contribution of α ′‐martensite to work hardening of cyclically loaded type 304SS increased with decreasing fatigue life. However, the contribution of austenite slightly changed. Higher work hardening via DIM transformation improves the fatigue life of type 304SS than that of type 316SS in LCF regime in the same fatigue stress amplitude. Thus, the contribution of α ′‐martensite to work hardening is a determinant parameter, affecting the fatigue behavior of type 304SS. In HCF regime when the α ′‐martensite had a small contribution to the work hardening, the fatigue life of type 304SS is slightly higher than that of type 316SS.