Research on heat treatment process of GH4202 alloy forged bars
The effects of solid solution,aging temperature,and time on the microstructure and properties of GH4202 alloy forged bars were studied.As the solid solution temperature increases,the grains of GH4202 alloy forged bars gradually grow.Local grains grow abnormally above 130℃,and as the temperature rises to 1150℃,the grains grow rapidly and uniformly.The solid solution time has little effect on the grain structure.In order to ob-tain the optimal grain structure,the solid solution system is 1 110～1 120℃×1～2h,AC.The room temperature tensile strength and yield strength increase with the increase of aging temperature.When the aging temperature is 830～840℃,the strength reaches its peak,and when the aging temperature increases again,the strength remains ba-sically unchanged.The room temperature plasticity increases with the increase of aging temperature.At 830℃ag-ing,the room temperature plasticity index reaches its peak,and when the aging temperature increases again,the room temperature plasticity index tends to stabilize.There is no significant relationship between the tensile strength and yield strength at 700℃and the aging temperature;When the aging temperature is≥830℃,the high-tem-perature plasticity index can reach over 30%.The optimal heat treatment process for GH4202 alloy forged bars is 1 110～1 120℃×1～2 h,AC,830～850℃×10 h,AC aging treatment.
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