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中文摘要：
对激光快速成形粉末高温合金的组织和性能进行了研究。结果表明，激光快速成形沉积态组织中γ’沉淀相的析出受到抑制，γ’沉淀相在γ基体中的体积分数小，γ’相的平均尺寸显著细化。在热处理制度为1165℃固溶2h空冷＋760℃时效16h空冷的基础上，适当延长时效时间将有助于细小γ’沉淀相的长大，使固溶时效态组织的抗拉强度提高到P／M＋HIP标准的89％，屈服强度已经接近粉末冶金水平，显示出较好的强化效果。
英文摘要：
The microstructure and mechanical properties of superalloy by laser rapid forming（LRF） from powder have been investigated in the paper. The results show that the precipitation of γ＇ is restrained during the LRF process, which is displayed that the volume fraction of γ＇ precipitation is small and the average sizes of γ＇ fine remarkably. It has been found that prolonging aging time is help to the grow up of tiny γ＇ on the basis of heat treatment process（1165 ℃, 2 h/SQ＋760 ℃, 16 h/AC）. As a result, the ultimate strength of the sample with solution-aging microstructure reached 89% of that by P/M＋HIP process, and the yield strength approaches to the value obtained by P/M＋HIP.
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