GH4202合金锻制棒材热处理制度研究

Research on heat treatment process of GH4202 alloy forged bars

研究了固溶、时效温度和时间对GH4202合金锻制棒材组织性能的影响。GH4202合金锻棒随固溶温度升高,晶粒逐渐长大,1130℃以上局部晶粒异常长大,温度升高至1150℃,晶粒快速均匀长大。固溶时间对晶粒组织影响不大,为了获得最佳晶粒组织,固溶制度为1110~1120℃×12h,AC。室温抗拉强度和屈服强度随时效温度升高而增大,时效温度830~840℃时,强度达到峰值,时效温度再升高,强度基本不变。室温塑性随时效温度升高而增大,830℃时效时,室温塑性指标达到峰值,时效温度再升高,室温塑性指标趋于稳定。700℃抗拉和屈服强度与时效温度无明显关系;高温塑性随时效温度升高而增大,时效温度≥830℃,高温塑性指标可达到30%以上。GH4202合金锻棒最佳热处理工艺:1110~1120℃×12h,AC,830~850℃×10 h,AC时效处理。

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 obtain the optimal grain structure,the solid solution system is 1110~1120℃×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 basically unchanged.The room temperature plasticity increases with the increase of aging temperature.At 830℃aging,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-temperature plasticity index can reach over 30%.The optimal heat treatment process for GH4202 alloy forged bars is 1110~1120℃×1~2 h,AC,830~850℃×10 h,AC aging treatment.