铸态及均匀化Ni-35Cr基高温合金的热变形行为

Hot Deformation Behavior of Cast and Homogenized Ni-35Cr Based Superalloy

摘要:

采用Gleeble热/力模拟试验机，对Ni-35Cr基GH4648高温合金的铸锭热加工性能进行了研究。结果表明：GH4648合金铸锭的开始再结晶温度为1050 ℃，在此温度以上，随着变形温度升高，动态再结晶越充分。在此基础上，对比分析了1180 ℃，45 h均匀化处理对合金铸锭热加工性能的影响，发现均匀化处理对GH4648合金铸锭内的动态再结晶有一定的抑制作用。

Abstract:

The hot deformation behavior of the cast Ni-35Cr based GH4648 superalloy was studied though hot compressing testing on a Gleeble-1500 simulator. The results show that the onset temperature of the dynamic recrystallization (DRX) in the cast GH4648 alloy is 1050 oC. The DRX process is going more sufficient with higher temperature. Below 1050 oC, there is no DRX grain. The effect of homogenization heat treatment on the hot working ability of cast GH4648 alloy was studied. After homogeneous heat treatment at 1180 oC for 45 h, the DRX process is restrained and resistance of deformation is increased.