锻压技术

锻态镍钛合金的热变形行为

英文标题：Hot deformation behavior of forged Ni-Ti alloy

作者：王臻徐效文

单位：中南大学

分类号：TG139

出版年,卷(期):页码：2018,43(10):167-175

摘要：

采用Gleeble-3800热压缩模拟实验机，对锻态镍钛合金进行等温热压缩实验，研究其热变形行为，实验条件为应变速率0.01~10.00 s-1，变形温度650~1050 ℃。实验得出了镍钛合金在热压缩过程中的应力-应变曲线，分析了应变对材料变形常数的影响，并根据实验数据建立了锻态镍钛合金热变形过程中流动应力与变形温度、应变速率和应变量的本构关系，从而确定了锻态镍钛合金在热压缩变形时的热变形激活能Q和结构因子A。并利用热加工图，确定了锻态镍钛合金在成形过程中的安全加工温度。通过实验表明：锻态镍钛合金的热变形激活能Q为222.540 kJ·mol-1，锻态镍钛合金较佳的热变形温度范围为850~920 ℃，应变速率低于1.00 s-1。

The isothermal compression test of forged Ni-Ti alloy was conducted by thermo-compression simulator Gleeble-3800 with the strain rate of 0.01-10.00 s-1 and the deformation temperature of 650-1050 ℃, and the hot deformation behavior of forged Ni-Ti alloy was studied. Then, the stress-strain curve of Ni-Ti alloy in the hot compression process was obtained by experiment, and the influence of strain on the deformation constant of material was analyzed. Furthermore, the constitutive relationships between the flow stress and the deformation temperature, strain rate and strain in the hot deformation process of forged Ni-Ti alloy were established based on experiment data to determine the hot deformation activation energy Q and the structure factor A in the hot compression deformation of forged Ni-Ti alloy, and the safe processing temperature in the forming process of forged NiTi alloy was determined by hot processing map. The results show that the hot deformation activation energy Q of forged Ni-Ti alloy is 222.540 kJ·mol-1, the better hot deformation temperature range is 850-920 ℃, and the strain rate is lower than 1.00 s-1.

基金项目：

甘肃省科技重大专项计划（17ZD2GC011）

王臻(1993-)，男，硕士研究生，E-mail：627730942@qq.com；通讯作者：徐效文(1978-)，男，博士，副教授，E-mail：76267602@qq.com

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