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采用应力法以及界面能法对不同取向的镍基单晶合金在950℃下的筏化类型进行了预测.上述两种方法的筏化预测结果一致,[001]取向为N型筏化,[011]取向为P型筏化,[111]取向不筏化.进一步,根据筏化预测结果以及晶体滑移理论,结合Kachanov-Robotnov(K-R)损伤演化公式,建立了一个镍基单晶合金蠕变模型,采用该模型并结合商用有限元软件Abaqus的用户材料子程序(UMAT)二次开发接口,对[001],[011]和[111]取向下的CMSX-4镍基单晶合金,在950℃,180~450MPa应力条件下的蠕变变形行为进行了模拟.该模型能够准确预测镍基单晶合金的筏化类型以及滑移系开动规律,更加符合材料的蠕变变形物理机制,因此模型可以对镍基单晶合金的高温蠕变曲线的第2,3阶段进行很好的模拟,并得到了试验的验证.
The rafting types of nickel-based single crystal alloys with different orientations at 950 ℃ were predicted by using the stress method and interfacial energy method.The results of the raft prediction of the two methods are consistent, the orientation of [001] is N-type raftization, 011] oriented P-type raft, [111] orientation is not raft. Further, according to the prediction of the raft and the theory of crystal slip, combined with Kachanov-Robotnov (KR) damage evolution formula, a nickel- In this paper, based on the UMAT secondary development interface of Abaqus, a commercial finite element software, the model of CMSX-4 nickel-base single crystal alloy with [001], [011] and [111] The creep deformation behavior under the stress of 950 MPa and 180 ~ 450 MPa was simulated.The model can accurately predict the type of the raft and the movement law of the slip system, which is more in line with the physical mechanism of creep deformation of the material, Therefore, the model can simulate the second and third stages of the high temperature creep curve of Ni-based single crystal alloys and has been verified by experiments.