纳米孪晶强化304奥氏体不锈钢的应变控制疲劳行为
收稿日期: 2021-08-17
修回日期: 2021-09-04
网络出版日期: 2021-10-13
基金资助
国家自然科学基金项目(51931010);中国科学院前沿科学重点研究计划项目;HZ2029,辽宁省兴辽英才计划项目(XLYC1802026);中国科学院青年创新促进会项目(2019196)
Strain-Controlled Fatigue Behavior of Nanotwin- Strengthened 304 Austenitic Stainless Steel
Received date: 2021-08-17
Revised date: 2021-09-04
Online published: 2021-10-13
Supported by
National Natural Science Foundation of China(51931010);Key Research Program of Frontier Science and International Partnership Program, Chinese Academy of Sciences(GJHZ2029);Liaoning Revitalization Talents Program(XLYC1802026);Youth Innovation Promotion Association, Chinese Academy of Sciences(2019196)
潘庆松 , 崔方 , 陶乃镕 , 卢磊 . 纳米孪晶强化304奥氏体不锈钢的应变控制疲劳行为[J]. 金属学报, 2022 , 58(1) : 45 -53 . DOI: 10.11900/0412.1961.2021.00342
Engineering nano-scale twin boundaries has been recognized as a novel strategy to achieve a superior combination of tensile strength, ductility, and fatigue limit in metallic materials. However, to date, the strain-controlled fatigue behavior of nanotwin (NT)-strengthened metals is still rarely explored, most possibly owing to the difficulty in preparing bulk fatigue samples. In this work, a bulk heterogeneously structured 304 stainless steel (304 SS) containing 30% volume fraction of NT bundles embedded in the micrometer-sized grain matrix was prepared and studied under constant plastic strain amplitude-controlled fatigue tests. A considerable fatigue life and much higher cyclic flow stress level, while maintaining a weaker degree of cyclic softening at larger strain amplitude, was achieved in NT-strengthened 304 SS, compared with its coarse-grained counterpart in the same strain-controlled fatigue tests. This is fundamentally distinct from the more obvious softening behavior of conventional nanostructured metals induced by strain localization at larger strain amplitude. Such exceptional low-cycle fatigue properties were attributed to the presence of a high-strength NT structure associated with novel mechanical stability and its co-deformation with surrounding grains, effectively suppressing strain localization and fatigue crack initiation.
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