Transactions of Materials and Heat Treatment

Title：Forging process on all-terrain vehicle track shoe based on rheological behavior and thermal processing map

Authors： Liu Hui1 Jiang Li2 He Huanhuan1

Unit： 1.Department of Mechanical and Electrical Engineering Xinjiang Career Technical College 2.Mechanical and Electronic Engineering Institute Xinjiang Vocational University

KeyWords： thermal compression Arrhenius constitutive equation rheological behavior thermal processing map track shoe

ClassificationCode：TG316；TG146.4

year,vol(issue):pagenumber：2023,48(8):17-24

Abstract：

In order to obtain the high-performance forgings of a certain track shoe with uniform structure, grain size meeting the requirements and no forging defects, firstly，the rheological datas of 42CrMo steel were obtained by thermal compression experiments, and the Arrhenius constitutive equation was constructed. The results show that when the strain rate is 0.01-0.1 s-1 and the temperature is higher than 850 ℃, there is a significant peak in the true stress-true strain curve of material, and the softening effect is obvious. The dynamic recrystallization softening effect is significantly greater than the work hardening effect. When the strain rate is higher, the peak stress of material is not obvious, and the softening effect is not significant, which indicates that under the high strain rate, the material cannot fully recrystallize in time, and its softening mechanism is dynamic recovery. Secondly, the thermal processing maps of 42CrMo steel under different deformation amounts were constructed, and it is found that the high-risk areas of instability for 42CrMo steel are mainly located in the low temperature and high strain rate areas, and a few are located in the high temperature and low strain rate areas. When the logarithmic strain rate is less than -2.5 and the temperature is 850-1050 ℃, the material has high thermal processing stability during the thermal processing. Furthermore, the forging process of a certain track shoe was analyzed by numerical simulation, the forgings with good forming effect and no forging defects such as folding and insufficient filling was obtained, and all indicators meet the design requirements. Finally, the feasibility of the forging process was verified by trial production, and the microstructure analysis verifies that the recommended forging temperature and strain rate can obtain fine and uniform microstructure.

Funds：

新疆应用职业技术学院重点教改项目（XYZY2021 KYB001）

作者简介：刘辉（1977-），女，硕士，副教授,E-mail：76721819@qq.com

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