分别制备了偏离<001>、<011>及<111>取向的镍基单晶高温合金DD432样品，测定其在760℃、810 MPa和1000℃、280 MPa条件下的持久性能。结果表明，在760℃、810 MPa条件下3个取向的样品组织未发生明显筏化，具有明显的持久寿命各向异性，其中<111>取向样品的持久寿命最长，随着取向偏离角度的增加，持久寿命逐渐降低；<001>取向样品的持久寿命较低，且随着取向偏离角度的增大而增长；而<011>取向样品的持久性能最低，随着取向偏离角度的增加持久性能也有所提升。在1000℃、280 MPa条件下3个取向样品的组织都明显筏化，且筏化组织差异明显，持久性能各向异性有所下降但仍然存在，<111>取向样品的持久性能较<001>取向样品略好，<011>取向样品的持久性能虽然有所提升但依然最差。随着取向偏离角度的变化持久寿命仍然存在差异，但没有表现出明显的线性规律。

Ni base superalloys have been extensively used in advanced aeroengine. With the development of modern aviation industry, high demands are being placed on the comprehensive performance of Ni base superalloys at high temperatures. To meet this demand, numerous refractory alloy elements are added to Ni base superalloys. However, in this way, the temperature bearing capacity of the alloy is enhanced, while the microstructure stability is reduced. Therefore, some scholars proposed to develop single crystal blades with various orientations through the anisotropy of a single crystal alloy. The stress rupture anisotropies of a Ni base single crystal superalloy DD432 under 760^oC, 810 MPa and 1000^oC, 280 MPa have been investigated in this study. The stress rupture properties of Ni base single crystal superalloy DD432 that deviated from <001>, <011>, and <111> with certain degrees were measured. It is discovered that rafting does not occur in specimens with three orientations, and the stress rupture life anisotropy of specimens is visible at 760^oC and 810 MPa. Furthermore, the stress rupture life of specimens with <111> orientation is the best, and as the orientation deviation degree increases, the stress rupture life gradually decreases. The stress rupture property of specimens with <001> orientation is lower than that of specimens with <111> orientation, and the stress rupture life increases with increasing orientation deviation degree. The creep resistance of specimens with <011> orientation is the lowest, and the stress rupture property is also enhanced as the orientation deviation degree increases. Rafting occurred in all the specimens with three orientations under the conditions of 1000^oC and 280 MPa, and the stress rupture property anisotropy of specimens decreased, but still existed. The stress rupture property of specimens with <111> orientation was slightly better than that of specimens with <001> orientation, and the stress rupture property of specimens with <011> orientation was still the worst, although it improved. A difference still exists in the stress rupture life as the degree of orientation deviation changes. However, there is no visible linear tendency.