铸态Cu-1.16Ni-0.36Cr合金热变形行为及热加工图%Hot Deformation Behavior and Processing Diagram of As-cast Cu-1.16Ni-0.36Cr Alloy
河南科技大学材料科学与工程学院 河南科技大学河南省有色金属材料科学与加工技术重点实验室 河南省科学院 有研科技集团有限公司有色金属材料制备加工国家重点实验室 有研工程技术研究院有限公司 佛山科学技术学院机电工程与自动化学院
2024-01-02
Cu-Ni-Cr合金 热压缩变形 本构方程 热加工图 动态再结晶
利用Gleeble-1500型热模拟试验机,研究了Cu-1.16Ni-0.36Cr合金在变形量为50%、变形温度为750~950℃、变形速率为0.01~10 s<sup>-1</sup>下的热压缩变形行为,建立该合金热变形的本构方程和热加工图.结果表明:Cu-1.16Ni-0.36Cr合金在700~900℃的变形温度下以动态回复为主,在950℃下发生完全的动态再结晶.通过真应力应变曲线得到了该合金热变形的本构方程和热加工图.根据应变对流变应力的影响对本构方程进行修正,通过修正后的回归方程对流变应力进行模拟,模拟结果与实验结果吻合.热加工图表明,该合金适宜的热变形工艺参数为900~950℃和0.1~1 s<sup>-1</sup>,其中950℃和1 s<sup>-1</sup>变形条件下组织状态最佳,为晶粒细小均匀的等轴晶.%Hot compressive deformation behavior of Cu-1.16Ni-0.36Cr alloy at the temperatures from 750℃to 950℃and the strain rates from 0.01 s<sup>-1</sup> to 10 s<sup>-1</sup> was studied on a Gleeble-1500 thermal simulator.The constitutive equation and processing diagram of the alloy were established.The results showed that the dynamic recovery of Cu-1.16Ni-0.36Cr alloy was dominant at the strain temperature between 700℃to 900℃,and dynamic recrystallization took place at 950℃.The constitutive equation and processing diagram were obtained by the true stress-strain curve.Based on the effect of strain on flow stress,the constitutive equation was modified.The flow stress was simulated by regression equation,and the results were in good agreement with the experimental results.The processing diagram showed that the suitable thermal deformation parameters were 900-950℃of deformation temperatures and 0.1-1 s<sup>-1</sup> of strain rate.Equiaxed grains with fine grains are obtained at appropriate defor-mation parameters,which were 950℃of temperature and 1 s<sup>-1</sup> of strain rate.
