Research on Residual Stress of Cr12 Surface Layer after Rolling Processing

7th Annual International Conference on Materials Science and Engineering

Qi, Kaihua^1 ; Guo, Peiquan^1 ; Zhang, Haiquan^1 ; Qiao, Yang^1

Department of Mechanical Engineering, University of Jinan, 336 Nanxinzhuangxi Road, Jinan, Shandong

250022, China^1

关键词: Contact Stress;    Fatigue strength;    Rolling motion;    Stable state;    Stress decrease;    Subgrain sizes;    Surface layers;    Workpiece;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/562/1/012134/pdf
DOI  :  10.1088/1757-899X/562/1/012134

来源: IOP

【 摘 要 】

In normal temperature, the effect of rolling motion and extrusion stress will lead to the occurrence of subgrain size refinement, changes of the dislocations and phase transition caused by plasticity, which will change the mechanical properties of the workpiece's material on the surface layer and directly affect the fatigue strength and service life of the workpiece. In this paper, the residual stress of Cr12 after rolling processing by different rolling pass and contact stress are studied through experiments. Through the analysis of the test results, it is shown that: with the increase of rolling pass, the residual stress on the workpiece surface layer increase continuously, after rolling 3 passes, the residual stress will no longer continue to increase and remain stable. When the contact stress is less than 717 MPa, the residual stress increase obviously, and when it reaches 717 MPa, the residual stress keep relatively stable state with the increase of contact stress. In the depth direction, the residual stress decreases with the depth, and the maximum residual stress may appear at a certain depth from the surface.