Hot Tensile and Fracture Behavior of 35CrMo Steel at Elevated Temperature and Strain Rate
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Hot Tensile Behavior
3.2. Fracture Morphology Analysis
3.3. Microstructure Analysis
4. Conclusions
- The true stress-strain curves indicated that the hot tensile deformation behavior of 35CrMo is sensitive to the temperature and strain rate, and the resistance stress decreases when the temperature increases or the strain rate decreases. Further, neck transferability and workability of 35CrMo steel can be improved by increasing the tensile temperature.
- DRX is accompanied by the formation of cavities, and the cavitations are easier to initiate in the recrystallized grains rather than at the grain boundaries. The grain size reduces for the decreased deformation temperature and the increased strain rate, which makes the generation and coalescence of the cavities more difficult, and voids form around the inclusions, leading to the fracture surfaces covered with numerous small dimples. However, for the increased mobility of the atoms and boundaries and prolonged time, void combination is apparently easier under a high temperature and low strain rate, leading to fracture surfaces with a small number of big dimples.
- The fracture mechanism of 35CrMo steel includes the nucleation, growth, and combination of the microvoids during hot tensile testing. Damage tolerance can be improved with increased deformation temperature and decreased strain rate. To reduce the probability of the formation of cavitation in the matrix, deformation after the completion of DRX for 35CrMo steel should be carefully controlled.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Xiao, Z.; Huang, Y.; Liu, H.; Wang, S. Hot Tensile and Fracture Behavior of 35CrMo Steel at Elevated Temperature and Strain Rate. Metals 2016, 6, 210. https://doi.org/10.3390/met6090210
Xiao Z, Huang Y, Liu H, Wang S. Hot Tensile and Fracture Behavior of 35CrMo Steel at Elevated Temperature and Strain Rate. Metals. 2016; 6(9):210. https://doi.org/10.3390/met6090210
Chicago/Turabian StyleXiao, Zhengbing, Yuanchun Huang, Hui Liu, and Sanxing Wang. 2016. "Hot Tensile and Fracture Behavior of 35CrMo Steel at Elevated Temperature and Strain Rate" Metals 6, no. 9: 210. https://doi.org/10.3390/met6090210