The Study on Plasma Bonding of H13 Steel at Low Tem-perature Assisted by Surface Nanocrystallizatlon Tech-nology
Plasma bonding treatment was carried out at low temperature for the hot work die steel H13 assisted by surface nanocrystallization technology in this paper. At the same time, the thermal fatigue property of it was investigated through thermal fatigue testing with 3000 continuous cycles from room temperature to 700 °C. The changes of structure and grain size in surface layer were characterized by high-resolution transmission electron microscopy (HRTEM). After plasma boriding at 580 °C for 4 h, the phase composition, morphology and in-situ nanomechanical property of boride layer were investigated by X-ray diffraction spectroscopy (XRD), scanning electron microscope (SEM), nanoindentation test, respectively. The results show that the boride layer with about thickness of 5 μrn is composed with two phases of Fe2B and FeB. The nanohardness of boride layer is as high as 21 GPa. Furthermore, thermal fatigue testing shows that the boride layer with excellent oxidation resistance and mechanical strength at elevated temperatures could effectively delay the crack initiation and impede the crack propagation. Therefore, the thermal fatigue property of H1 3 can be remarkably improved.
hot work die steel H13 surface nanocrystallization plasma boriding treatment at low temperature
Yang Haopeng Wu Xiaochun Wu Tianrong
School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
国际会议
西安
英文
309-314
2011-05-11（万方平台首次上网日期，不代表论文的发表时间）