超温处理对GH4169合金显微组织及拉伸性能影响规律研究

Study on Effect of Overheat Treatment on Microstructure and Tensile Properties of GH4169

采用不同热处理参数模拟超温服役工况,研究了超温工况下温度和时间对GH4169合金显微组织形貌和力学性能的影响。结果表明:合金内δ相的含量随温度的升高呈先升高后下降的趋势,900℃时δ相的析出量最大。在800~950℃时,δ相随超温时间的增加而增加,在1000~1050℃时,δ 相随超温时间的增加而减少。合金的显微维氏硬度随超温处理温度的升高而不断下降。800~900℃和950~1000℃时,GH4169合金的抗拉强度随超温处理温度的升高大致呈下降的趋势,900~950℃时,合金的抗拉强度变化不明显。合金的塑性随温度的升高而持续增大。

The effects of temperature and time on the microstructure and mechanical properties of GH4169 alloy were studied by using different heat treatment parameters to simulate the superheating service condition. The results show that, the content amount of δ phase in the alloy increases first and then decreases with the increase of temperature, and the precipitation of δ phase is the largest at 900 ℃. In 800-950 ℃, the δ phase increases with the increase of superheating time, while in 1000-1050 ℃, the δ phase decreases with the increase of superheating time. The micro-Vickers hardness of the alloy decreases with the increase of superheating treatment temperature. In 800-900 ℃ and 950-1000 ℃, the tensile strength of GH4169 alloy decreases with the increase of superheating treatment temperature. In 900-950 ℃, the tensile strength of the alloy does not change significantly. The plasticity of the alloy continues to increase with the increase of temperature.