Influence of heat treatments on mechanical behavior of FV520B steel
Influence of heat treatments on mechanical behavior of FV520B steel
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DOI：
10.1111/ext.12019
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发表时间：
2015-03
影响因子：
1.6
通讯作者：
J. L. Fan;J. L. Fan;X. Guo;Chengwei Wu;V. Crupi;E. Guglielmino
中科院分区：
文献类型：
--
作者：
J. L. Fan;J. L. Fan;X. Guo;Chengwei Wu;V. Crupi;E. Guglielmino
通过试验研究了热处理工艺对FV 520 B不锈钢显微组织和力学性能的影响。采用锁相红外热成像技术对普通和热处理FV520B钢的疲劳强度进行了快速评估。预测值与传统试验方法所得结果吻合较好。疲劳试验过程中的温度增量与内部微观组织变化密切相关。用扫描电镜观察了疲劳断口形貌。结果表明，疲劳裂纹是从试样表面的角部萌生的。金相分析表明，FV 520 B钢力学性能的提高是由于在晶界形成了沿着分布均匀的第二相粒子的细回火马氏体。
Experimental tests have been carried out in order to investigate the influence of the heat treatments on the microstructures and mechanical properties of FV520B stainless steel. The fatigue strength of the common and heat-treated FV520B steels was rapidly assessed using the lock-in infrared thermographic methodology. Good agreements were achieved between the predicted values and those obtained by the traditional testing procedures. The temperature increments during the fatigue tests were tightly linked with the internal microstructural changes. The features of the fatigue fracture surface were observed by the scanning electron microscope. It is found that the fatigue microcracks were initiated from the corner of the specimen surface. The metallographic analysis shows that the improvement of the mechanical properties of FV520B steel is attributed to the formation of the fine-tempered martensite along with the secondary phase particles uniformly distributed at the grain boundary.