Taking nickel-based single crystal superalloy DD6 as the research object, different degrees of creep damage were prefabricated by creep interruption tests, and then the creep damage was repaired by the restoration heat treatment system of solid solution heat treatment and two-stage aging heat treatment. The results show that with the creep time increasing, the alloy underwent microstructure evolution including γ′ phase coarsening, N-type rafting and de-rafting. After the restoration heat treatment, the coarse rafted γ′ phase of creep damaged specimens dissolved, precipitated, grew up, and became cubic again. Except for the specimens with creep interruption of 100 h, the γ′ phase can basically achieve the same arrangement as the γ′ phase of the original sample. The comparison of the secondary creep test shows that the steady-state creep stage of the test piece after the restoration heat treatment is relatively increased, and the total creep life can reach the same level as the primary creep life. The high temperature creep properties of the tested alloy are basically recovered, and the restoration heat treatment effect is good.

中文翻译：

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基于热处理的镍基单晶高温合金的蠕变损伤修复

以镍基单晶高温合金DD6为研究对象，通过蠕变中断试验制备了不同程度的蠕变损伤，然后通过固溶热处理和两阶段时效热处理的修复热处理系统修复了蠕变损伤。 。结果表明，随着蠕变时间的增加，合金经历了微观组织的演变，包括γ′相粗化，N型筏化和脱筏化。经过恢复热处理后，蠕变损伤试样的粗筏γ′相溶解，沉淀，长大并再次变成立方。除了蠕变中断时间为100 h的样品外，γ'相基本上可以实现与原始样品的γ'相相同的排列。二次蠕变试验的比较表明，恢复热处理后的试件稳态蠕变阶段相对增加，总蠕变寿命可以达到与一次蠕变寿命相同的水平。被测合金的高温蠕变性能基本恢复，恢复热处理效果良好。