Transactions of Materials and Heat Treatment

Title：Study on work-hardening behavior of rack in cold roll-beating

Authors： Wang Xuefeng Yang Mingshun Cui Limu Miao Zhihong

Unit： Xi′an University of Technology

KeyWords： cold roll-beating work hardening hardening layer dislocation density microstructure

ClassificationCode：TG335

year,vol(issue):pagenumber：2019,44(3):155-163

Abstract：

For the cold roll-beating of rack, the hardness distribution of the formed tooth groove was measured along the normal direction of tooth profile, and the distribution of hardening layer along the depth direction and the influences of process parameters on the hardening degree of the tooth groove bottom, the tooth groove fillet, the tooth wall and the tooth top were obtained. Then, the microstructure of the formed tooth groove was analyzed, and the correspondence relationship between the dislocation density and the degree of hardening was obtained. The results show that the deformation of the tooth groove fillet is the largest, the dislocation plugging is significant, the hardening degree is the highest, the tooth wall is the second, and the tooth top is the lowest. Furthermore, the degree of grain refinement along the depth direction of the tooth groove is gradually reduced, the dislocation density is reduced, the degree of hardening is gradually weakened, and the hardness reaches the maximum in the subsurface due to the tooth groove bottom affected by multiple roll-beating effects.

Funds：

国家自然科学基金资助项目（51475366,51475146）；陕西省自然科学基础研究计划项目（2016JM5074）

王雪峰（1994-），男，硕士研究生，E-mail：wxf66699@163.com；通讯作者：杨明顺（1974-），男，博士，副教授，E-mail：yangmingshun@xaut.edu.com

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