对TA15电子束焊接接头的熔凝区和热影响区的显微组织、硬度、疲劳裂纹扩展速率、以及疲劳断口形貌进行了研究.结果表明:熔凝区的显微组织主要为粗针状α′马氏体组织,热影响区组织为α′马氏体组织+条片状的α相和β相,由接近熔凝区组织向母材组织过渡.母材的硬度较低,熔凝区平均硬度最高,热影响区的硬度介于两者之间.疲劳裂纹扩展速率高低与其显微组织密切相关,含塑性较好的片状α相较多的热影响区比熔凝区有较高的裂纹扩展抗力.
The microstructure, hardness, fatigue crack propagation and fatigue fractograph in the fusion zone (FZ) and heat affection zone (HAZ) of TA15 electron beam welded (EBW) joint were studied in this paper. The results indicate that the microstructure in FZ is characterized by bulky aciculate martensite, and in HAZ, the microstructure is composed of α' martensite + lamellar α and β. That is, it shows a transition from FZ to base material (BM). The hardness of FZ is largest,that of BM is the lowest, and HAZ with between them. The fatigue crack propagation rate is closely relative with their microstructure. The HAZ containing more plastic lamellar α exhibits a better resistance to the fatigue crack propagation than FZ.
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