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利用热压缩实验建立的本构模型结合挤压力极限方程和温升极限方程构建了2099合金的挤压极限图,给出了挤压极限曲线的临界方程,并对挤压极限图的正确性进行了验证。结果表明,随着初始锭温的升高,压力极限曲线所对应的挤压速度增加,而温升极限曲线所对应的挤压速度降低;2099合金最佳挤压温度为410~460℃,当挤压比λ分别为29和48时,挤压速度可分别在不超过10和6 mm/s内选取;在安全区进行挤压时,两种挤压比条件下均可得到表面无缺陷的型材;挤压温度升高到480℃,挤压速度在大于温升曲线临界值挤压时(λ=29),型材表面出现周期性裂纹;挤压实验结果验证了挤压极限图的正确性,并可用于指导实际生产。
Based on the constitutive model established by thermo-compression experiment, the squeegee limit equation and the temperature-rise limit equation were used to construct the squeeze limit diagram of 2099 alloy. The critical equation of squeeze limit curve was given and the correctness of the squeeze limit diagram Verified. The results show that as the initial ingot temperature increases, the extrusion speed corresponding to the pressure limit curve increases, while the extrusion speed corresponding to the temperature rise limit curve decreases. The optimum extrusion temperature of 2099 alloy is 410-460 ° C. The extrusion rates can be selected within no more than 10 and 6 mm / s, respectively, for the extrusion ratio λ of 29 and 48, respectively; when the extrusion is carried out in the safety zone, the surface is flawless at both extrusion ratios The extrusion temperature increased to 480 ℃ and the extrusion speed was greater than the critical value of the temperature rise curve (λ = 29). The periodic cracks appeared on the profile surface. The results of the extrusion test verified the correctness of the extrusion limit diagram , And can be used to guide the actual production.