- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | LI Qiuze, HAN Junchen, CHEN Liang, ZHANG Yingchun, ZHANG Minnan, DAI Guangze. Service Performance of ER8C and ER8 Wheels for High-Speed Electric Multiple Unit[J]. Journal of Southwest Jiaotong University, 2021, 56(6): 1311-1318. doi: 10.3969/j.issn.0258-2724.20200242
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In order to fully understand the service performance of ER8C and ER8 wheels for high-speed electric multiple units (EMUs), the chemical composition, the conventional mechanical properties, the fatigue properties, the impact properties, the ductile-brittle transition temperature, the fracture toughness, the fatigue crack growth threshold, the fatigue crack growth rate and etc of in-serving and over-served wheels materials were measured by electric spark direct reading spectrometer(OBLFQSN 750). The metallographic structure of the both wheels materials was analyzed,and the service performance of the both wheels were assessed. The results show as follows: 1） Compared with the ER8 wheel, the ER8C wheel has 2.74 times higher Si content, 1.29 times higher Mn content, 45% lower total Cr + Mo + Ni content and slightly lower C content; their tensile and yield strengths have increased by 5%, and their fatigue strength has increased by 15%. 2）The microstructure of the wheels contains pearlite and a small amount of ferrite, the same depth under the tread, the ferrite in the ER8C wheel is more uniform and fine, the grain size is greater than 8.5, and the ferrite wheel in the ER8 material is coarse and the grain size is grade 8. 3) The ductile-brittle transition temperature of the ER8C wheel is 84.30 ℃ and that of the ER8 wheel is 71.97 ℃. The working condition of wheels is in the brittle zone of two materials. 4) The fracture toughness of the ER8C wheel is about 6% higher than that of the ER8 wheel. However, the crack propagation threshold of the ER8 wheel is 17% higher than that of the ER8C wheel, where their crack growth rates are almost the same. 5) During service, the vertical wear rate of the ER8C wheel is slightly higher than that of the ER8 wheel.
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