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本文采用自行设计的一种测试装置模拟热裂纹的形成过程。对A1—Cu合金热裂纹形成的温度和热裂纹形成时的临界断裂应力的研究表明,热裂纹形成的温度和临界断裂应力均与变形速度有着密切地关系:随着变形速度的增加,热裂纹形成的温度也相应地上升;而合金的临界断裂应力与变形速度的关系则存在着一个峰值。同时对热裂纹的形成条件进行了理论解析,当满足V<(KR/Es+β/τ-γ·R)·ι条件时,热裂纹将不产生。
In this paper, a self-designed test device to simulate the formation of hot cracks. The research on the temperature and the critical rupture stress of Al-Cu alloy during the formation of hot cracks shows that the temperature and the critical rupture stress of the hot cracks are closely related to the deformation rate. With the increase of the deformation rate, the thermal cracks The temperature of the formation also rises correspondingly; But there is a peak value of the relationship between the critical fracture stress of the alloy and the deformation speed. At the same time, the formation conditions of the hot crack were theoretically analyzed. When the condition of V <(KR / Es + β / τ-γ · R) · ι is satisfied, the hot crack will not be generated.