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通过设计滑移系直接受分切应力的剪切试样形式 ,对镍基单晶超合金在 70 0℃、850℃和 950℃时的瞬时剪切强度和剪切蠕变性能进行了研究。试验结果表明 ,本研究试样形式可以直接测量单滑移系的滑移规律 ,未发现晶体取向相关性。通过转换公式 ,瞬时剪切强度与圆棒试验结果相吻合。应用扫描电镜 (SEM)对试样断口分析表明 ,断口由平整的小刻面组成 ,从而进一步验证本试验的有效性 ,同时发现 ,由夹杂形成的空洞和平行受载方向的裂纹对瞬时和蠕变强度起着重要影响。
The instantaneous shear strength and shear creep behavior of Ni - based single crystal superalloys at 70 0 ℃, 850 ℃ and 950 ℃ were studied by designing shear specimens whose slip system was directly affected by shear stress. The experimental results show that the sample form of this study can directly measure the slip rule of single slip system, and the correlation of crystal orientation is not found. Through the conversion formula, the instantaneous shear strength is consistent with the round rod test results. The fracture analysis of the specimen by scanning electron microscopy (SEM) shows that the fracture is composed of flat facets, so as to further verify the validity of this test. At the same time, it is found that the cracks formed by the inclusions and the parallel loading direction have no effect on the instantaneous and creep Variable strength plays an important role.