不同热处理的热连轧GH4169合金组织及抗蠕变性能研究

Effects of Different Heat Treatments on Microstructures and Creep Resistance of Hot Continuous Rolled GH4169 Alloy

摘要:

研究了3种不同热处理工艺下热连轧GH4169合金的组织与抗蠕变性能。结果表明，3种不同的热处理工艺对晶粒大小有一定的影响，DA态热连轧 GH4169合金的组织最细小，HST态合金晶粒尺寸比ST态合金晶粒尺寸略大；δ相的含量随固溶处理时间的增加而增加，且主要在晶界处析出。在650 ℃/725 MPa的实验条件下，DA态热连轧 GH4169合金的抗蠕变性能最好，HST态合金抗蠕变性能最差。对3种不同热处理工艺的热连轧GH4169合金蠕变断裂试样的断口进行观察，其断裂方式主要表现为沿晶断裂。

Abstract:

The effects of three different heat treatments on microstructures and creep resistance of hot continuous rolled (HCR) GH4169 alloy were investigated. It is found that different heat treatments have an effect on grain size of HCR GH4169 alloy. The grain size of the sample after DA treatment is the smallest and that of the sample after HST treatment is the biggest. The content of d-phase increases with the increasing of the time of the solution heat treatment, and it mainly precipitates at the grain boundary. Under 650 °C/725 MPa experimental conditions, the HCR GH4169 after DA heat treatment has powerful creep resistance and long life time, while the HCR GH4169 after HST heat treatment has short life time. The fracture mode of creep specimens after heat treatments is intergranular fracture.