Abstract:

In this paper the dependence of flow stress in alloy GH169 on the deformation temperature, strain and strain rate based on the data of hot working simulation test was defined for the first time. Experimental results indicate that for the alloy GH169 the values of flow stress at high temperatures are much higher than that of alloy steel and the work hardening is remarkable. The deformation conditions have significant influence on the flow stress and microstructure of alloy GH169. It was found that under certain conditions fine grain structure can be obtained even though the deformation processes were carried out at high temperatures. This finding is beneficial to the raise of productivity of forming processes. Increasing the cooling rate after deformation is also favourable to the development of fine grain structure. To osum up, the microstructure of alloy GH169 can be controlled effectively through thermomechanical treatment.

Key words: alloy GH169 deformation condition, flow stress, mi-crostructure