以试验方法研究了FGH96粉末高温合金涡轮盘在空冷、风冷和油淬等条件下的表面换热行为,进而反算求解得到了界面换热系数,并将其应用到实际盘件热处理过程的数值模拟当中.结果表明,油淬条件下的界面换热系数远大于其他两种冷却方式,其最大值约为空冷换热系数最大值的10倍.现有工艺适合文中涡轮盘的热处理,淬火应力低于材料对应温度的屈服强度.
Heat extraction behaviors of a FGH96 P/M superalloy disk under static air cooling, forced air cooling and oil quenching conditions were studied by experiments and the surface heat transfer coefficients were obtained by solving the inverse thermal problems. Numerical simulation of the heat-treatment process of a real disk was then carried out. The results showed that the heat extraction rates of oil quenching were much higher than those in the other two conditions, and the peak value was almost 10 times of that in the static air cooling. The heat-treatment process was appropriate as the stress generated in the quenching process was lower than the yield strength of the disk material.
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