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Effect of Work‐Hardening Mechanisms in Asymmetrically Cyclic‐Loaded Austenitic Stainless Steels on Low‐Cycle and High‐Cycle Fatigue Behavior
Steel Research International ( IF 2.2 ) Pub Date : 2020-06-27 , DOI: 10.1002/srin.202000242 Masoud Moshtaghi 1, 2 , Mahdieh Safyari 3
Steel Research International ( IF 2.2 ) Pub Date : 2020-06-27 , DOI: 10.1002/srin.202000242 Masoud Moshtaghi 1, 2 , Mahdieh Safyari 3
Affiliation
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.
中文翻译:
非对称循环加载奥氏体不锈钢的工作强化机制对低循环和高循环疲劳行为的影响
使用EBSD和X射线衍射线轮廓分析,研究了非对称循环加载的亚稳型304不锈钢(SS)与稳定型316SS的位错特征和形变诱发马氏体(DIM)相变。在低周疲劳(LCF)方案中,304SS型与316SS型的位错密度之间的差异随着疲劳寿命的降低而增加,α'-马氏体对循环加载型304SS的工作硬化的贡献随着疲劳寿命的降低而增加。但是,奥氏体的贡献略有变化。在相同的疲劳应力幅度下,通过DIM变换进行的更高的工作硬化比LCF方案中的316SS类型的疲劳寿命更长,从而改善了304SS类型的疲劳寿命。因此,α的贡献'马氏体工作硬化是决定性参数,影响304SS型的疲劳行为。在HCF态中,当α '马氏体对加工硬化的贡献较小时,304SS型的疲劳寿命略高于316SS型。
更新日期:2020-06-27
中文翻译:
非对称循环加载奥氏体不锈钢的工作强化机制对低循环和高循环疲劳行为的影响
使用EBSD和X射线衍射线轮廓分析,研究了非对称循环加载的亚稳型304不锈钢(SS)与稳定型316SS的位错特征和形变诱发马氏体(DIM)相变。在低周疲劳(LCF)方案中,304SS型与316SS型的位错密度之间的差异随着疲劳寿命的降低而增加,α'-马氏体对循环加载型304SS的工作硬化的贡献随着疲劳寿命的降低而增加。但是,奥氏体的贡献略有变化。在相同的疲劳应力幅度下,通过DIM变换进行的更高的工作硬化比LCF方案中的316SS类型的疲劳寿命更长,从而改善了304SS类型的疲劳寿命。因此,α的贡献'马氏体工作硬化是决定性参数,影响304SS型的疲劳行为。在HCF态中,当α '马氏体对加工硬化的贡献较小时,304SS型的疲劳寿命略高于316SS型。