Importance of crack-propagation-induced ε-martensite in strain-controlled low-cycle fatigue of high-Mn austenitic steel
Importance of crack-propagation-induced ε-martensite in strain-controlled low-cycle fatigue of high-Mn austenitic steel
复制标题
DOI：
10.1080/09500839.2015.1052029
复制
发表时间：
2015-06
影响因子：
1.2
通讯作者：
Huichao Li;M. Koyama;T. Sawaguchi;K. Tsuzaki;H. Noguchi
中科院分区：
文献类型：
--
作者：
Huichao Li;M. Koyama;T. Sawaguchi;K. Tsuzaki;H. Noguchi
通过对Fe-30 Mn-4Si-2Al奥氏体钢进行聚焦离子束（FIB）缺口技术的裂纹扩展分析，研究了形变诱发ε-马氏体相变对应变控制低周疲劳（LCF）的作用。使用FIB缺口，我们分离的微观结构演变为宏观循环变形诱导和裂纹扩展诱导的微观结构。在此之后，我们阐明了疲劳裂纹扩展诱导的ε-马氏体相变，以在2%的总应变范围内减缓裂纹扩展，获得了1.1 × 104次循环的非凡LCF寿命。
We investigated the roles of deformation-induced ε-martensitic transformation on strain-controlled low-cycle fatigue (LCF) through crack-propagation analysis involving a notching technique that used a focused ion beam (FIB) setup on Fe–30Mn–4Si–2Al austenitic steel. Using the FIB notch, we separated the microstructure evolution into macroscopic cyclic deformation-induced and crack-propagation-induced microstructures. Following this, we clarified the fatigue crack-propagation-induced ε-martensitic transformation to decelerate crack propagation at a total strain range of 2%, obtaining an extraordinary LCF life of 1.1 × 104 cycles.