γ′相尺寸对一种含Re单晶镍基高温合金中温持久性能的影响

Effect of γ′ Size on Intermediate Temperature Stress Rupture Property of the Third Generation Single Crystal Nickel-base Superalloy Containing Re

摘要:

通过改变含Re单晶镍基高温合金热处理过程中的一次时效温度（1150， 1180 和1200 ℃），获得了3种不同形貌和尺寸的γ′相。随后，对含有不同γ′形貌的3种样品进行了中温高应力（760 ℃/800 MPa）持久试验。结果表明，γ′相的大小对单晶高温合金的持久性能有很大影响。适当增大γ′相的尺寸可以促进合金的均匀变形，从而提高合金的中温持久寿命。

Abstract:

Three kinds of γ′ phases with different morphologies and sizes were obtained by changing the primary aging temperature (1150, 1180 and 1200 °C) in the heat treatment process. Then, the samples with different γ′ morphologies were tested under condition of intermediate temperature and high stress (760 °C/800 MPa). The results show that the size of γ′ phase plays an important role in the stress rupture property. Increasing the size of γ′ phase appropriately can promote the uniform deformation of the alloy, thus improving the stress rupture life of the alloy.