热处理对一种镍基单晶高温合金组织及性能的影响

Effect of Heat Treatment on Microstructures and Properties of a Nickel-Based Single Crystal Superalloy

研究了热处理工艺对一种镍基单晶合金微观组织及持久性能的影响,并测定了合金微区成分偏析系数。结果表明,经1260℃/2hA.C+1300℃/4hA.C+1100℃/4hA.C+870℃/16hA.C的热处理明显改善了单晶合金元素的枝晶偏析,合金中γ′强化相的尺寸适当、分布均匀,合金获得理想的综合性能。

The investigation was carried out on the effect of heat treatment on the microstructure and rupture properties of a nickel-based super-alloy. The segregation coefficients after homogeneous solution, primary aging and secondary aging treatment were measured. The results show that the combined properties of the alloy can be obtained by using the heat treatment as follows： 1 260 ℃/2 h A.C＋1 300 ℃/4 h A.C＋1 100 ℃/4 h A.C＋870 ℃/16 h A.C because the segregation of the alloying elements can be improved, and the optimum content of the γ＇ phase and the critical misfit between the ,γ/γ＇ interfaces can be obtained through the heat treatment.