Effects of HIP Process on the Microstructure and Mechanical Properties of a Cast Superalloy

Abstract

The effects of HIP process on microstructure and mechanical properties of IN792 cast superalloy were studied. The results showed that HIP process produced more uniform and finer cubic γ′ than standard heat treatment. The difference of the mechanical properties should be caused by the microstructure changes. HIP process leads the homogeneous distribution of γ′ at dendritic arm and interdendritic area, and improved UTS and YS of tested alloy at 550°C. However, it played no role in increasing UTS and YS at room temperature and stress-rupture lives of 760°C/662MPa and decreased stress-rupture lives of 982°C/186MPa.

Microstructure and Stress Rupture Properties of K417G Superalloy at Different Hot Isostatic Pressing Temperatures

“…It uses the combined efect of high temperature and high pressure to densify the internal structure of metal castings and forms a circular creep raft structure around the pores, resulting in efective healing of metallurgical defects such as pores and segregation in the alloy [10][11][12]. As HIP is carried out under high-temperature and high-pressure conditions, it can effectively reduce the eutectic structure, homogenize the composition, and improve grain size and dendrite segregation [13,14]. After HIP of the as-cast K403 superalloy, Zhang et al [15] found that the size and the volume fraction of c′ precipitates were signifcantly improved and the morphology of carbides at the grain boundary changed from linear to granular.…”