用透射电镜观察了Inconel718及其改型合金中的时效析出组织调整Nb,Ti,Al的含量及比例,可以得到与通常合金中γ′和γ″单独析出有所不同的γ′和γ″的复合组织及包覆组织两类析出形态、其中γ″在γ′上析出的包覆组织具有较好的高温长期时效组织稳定性过时效试验结果表明.改型合金不同于Inconel718合金γ″致δ的相转变,却以强化相溶解而使材料软化
The precipitation structure in Incone1718 and modified alloys has been stu-died by means of TEM. The morphology of associated precipitation and compactmorphology of γ′+γ″ were obtained by modifying the contents of Al, Ti and Nb. Experimen-tal results show that the compact morphology of γ′+γ″ has the best thermal structure stability.Instead of γ″ transformation in Inconel 718 the dissolution of strengthening phases in modi-fied alloy leads material degradation.
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