镍基单晶合金的γ'相筏化准则及蠕变性能的晶体取向相关性

RAFTING PREDICTION CRITERION FOR NICKEL-BASE SINGLE CRVSTALS UNDER MULTIAXIAL STRESSES AND CRYSTALLOGRAPHIC ORIENTATIONE DEPENDENCE OF CREEP BEHAVIOR

基于最大降低相界面能密度原理，本文推导了一般应力状态下镍基单晶合金的强化相γ＇筏化准则，给出了筏化图，并得到试验结果的验证，进而定量分析了核化过程；利用该准则即最大相界面能密度降低，可以很好地描述蠕变性能的晶体取向相关性，并初步得到试验结果的验证．

Based on the relief of interfacial energy density by dislocation generation at the r-r'interfaces, a rafting prediction criterion has been developed for nickel-base single crystals under multiaxialstresses. The diagrams of rafting have been presented, and confirmed by experimental results. The raftingprocess has been analyzed quantitively by the relief of interfacial energy. The criterion has been appliedto study the creep behavior. The example of creep life analysis shows that the criterion can be correlatedsatisfactorily to the crystallographic orientation dependence of creep behavior.