用红外热像法监测交变载荷下试件表面的温升变化规律, 快速确定FV520B原材料和热处理材料的疲劳强度, 研究了热处理对FV520B不锈钢组织和力学性能的影响。 将疲劳试验过程中的试件表面的温度变化与材料内部微观结构的演化相联系, 以分析疲劳损伤状态, 进行安全性评估。金相观测发现, FV520B钢力学性能的提高是回火马氏体和基体中均匀弥散分布的第二相颗粒共同作用的结果。扫描电子显微镜对疲劳断口形貌特征的观察发现, 疲劳裂纹萌生于试件表面棱角上位向有利的晶粒处。
The effects of heat treatments on microstructures and mechanical properties of FV520B stainless steel were investigated. The infrared thermographic method (TM) was used to monitor the external temperature of specimens subjected to fatigue loading in order to fast determine fatigue strengths of the virgin and heat-treated FV520B steels. The relationship between the surface temperature and internal microstructures are closely linked to analyze the damage status for safety evaluation. The metallographic investigation shows that the improvement of mechanical properties of FV520B steel can be attributed to the formation of tempered martensite and secondary phase particles uniformly distributed in the matrix. The fatigue microcracks initiate from the favorably oriented grains at the corner of the specimen surface.
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