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针对涡轮盘的使用温度,研究了FGH97合金在700℃度下长时时效过程中的显微组织和力学性能变化。利用扫描电镜、物理化学相分析、热力学计算等方法研究了长时时效处理过程中析出相的演变。结果表明,合金中的一次和二γ’相组织稳定性良好,三次γ’相发生了较明显的粗化,合金中未发现明显的的TCP相析出。对合金2000 h和5000 h长时时效处理后的力学性能测试表明,长时时效后合金的综合力学性能优异。
According to the service temperature of turbine disk, the microstructure and mechanical properties of FGH97 alloy during aging at 700 ℃ were studied. The evolution of precipitated phases during long-term aging treatment was studied by scanning electron microscopy, physical-chemical phase analysis and thermodynamic calculation. The results show that the first and second γ ’phase microstructures in the alloy are well stabilized and the third γ’ phase is obviously roughened. No obvious TCP phase precipitation is found in the alloy. The mechanical properties of the alloy after 2000 h and 5000 h aging treatment show that the alloy has excellent mechanical properties after long aging.