Transactions of Materials and Heat Treatment

Title：Hot deformation behavior of forged Ni-Ti alloy

Authors： Wang Zhen Xu Xiaowen

Unit： Central South University

KeyWords： forged Ni-Ti alloy hot deformation behavior thermal simulation compression test constitutive equation hot processing map

ClassificationCode：TG139

year,vol(issue):pagenumber：2018,43(10):167-175

Abstract：

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.

Funds：

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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