Stress evolution mechanism during laser welding of ultra-high-strength steel: considering the effects of temperature sensitivity, strain hardening and annealing

Journal of Materials Research and Technology

Yu Huang¹  Lu Wang¹  Ruolin Wu²  Youmin Rong²  Jiajun Xu² 

[1] School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan, China;State Key Lab of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan, China;

关键词: Laser welding;    Stress;    Evolution mechanism;    Ultra-high-strength steel;    Flow stress model;   

DOI  :  

来源: DOAJ

【 摘 要 】

In this paper, a flow stress model of ultra-high-strength steel 1700MS was developed for laser welding. The model considered the material behaviors of strain hardening, temperature sensitivity, and annealing. The prediction yield strengths had good accordance with the experimental results. The effects of the three behaviors on welding stresses were studied through four calculation cases. The results showed that the behaviors should all be taken into account and there was a reasonable agreement between the predicted and measured stresses. In addition, the stress evolution process of each case was analyzed through the temperature-dependent curves of variables. The variables contained the accumulated plastic strain, deviatoric stress tensor, plastic strain, trial stress, and actual stress used in the stress updating process. It was found the behaviors could change the yield strength used in each case. The temperature sensitivity and annealing increased the possibility of plastic deformation, while the strain hardening decreased and thus gave rise to different stress updating rules.

【 授权许可】

Unknown