Effects of Grain Size on Mechanical Properties and Machining Deformation of GH4169 Casing Parts
Author of the article:XI Ruituo;ZHAO Yanhui;HE Jun;WANG Ying
Author's Workplace：Technology Center,AECC Xi'an Aero-Engine Ltd.,Xi'an 710021,China
Key Words：grain size residual stress machining deformation
Abstract：The microstructure,mechanical properties,residual stress and machining deformation of GH4169 alloy high-pressure turbine outer casing controlled by coarse and fine grains were comparative investigated,the effects of grain size on mechanical properties,residual stress distribution and machining deformation were discussed.The results show that with proper coarse grain control,the strength and plasticity of GH4169 alloy can be obtained,and the mechanical properties will not decrease obviously.The coarse grain is beneficial to reduce the residual stress of the forging parts,promote the uniform distribution of residual stress,and improve the machining deformation of parts.
