Hot Compression Deformation Behavior of Novel Ni-Based PM Superalloy WZ-A3

A novel third generation Ni-based PM (powder metallurgy) superalloy WZ-A3 was evaluated for its hot compression behavior. Gleeble simulation tests on the extruded WZ-A3 samples over the temperature range of 1040 similar to 4130 degrees C and strain rate range of 0.0025 similar to 0.01 s(-1) were conducted. The samples compressed under different conditions were analyzed for grain size and microstructure evolution. The results indicate that under the compression conditions of temperatures from 1070 degrees C to 1100 degrees C, and strain rate from 0.005 s(-1) to 0.01 s(-1), a uniform fine grain around 4 mu m with gamma+gamma' microduplex structure can be obtained, and no abnormal grain growth and necklace grains are observed throughout. To validate compression property of the extruded WZ-A3 alloy, hot die forging was conducted successfully to make two prototype forgings with the size of 190 mm in diameter and 115 mm in height.

Automated summary

By conducting Gleeble simulation tests and analyzing the grain size and microstructure evolution, it was found that the WZ-A3 alloy could obtain a uniform fine grain with a γ+γ' microduplex structure under certain compression conditions, without abnormal grain growth or necklace grains.