The Influence of Ultrasonic Impact on Microstructure and Properties of Rail Steel
The ultrasonic impact treatment on U70 rail way steel was carried out under different technology by using HJ-II ultrasonic impact machine. By fixing the output energy and changing the time of impacting from 3 min to 30min, the influence of impact time on microstructure was observed with the scanning electron microscope of 6360LA type, and the hardness of impacted surface was also researched before and after impact treatment. The wear resistance was tested by using M-2000 type wearing machine. The result indicates that the surface strength of rail steel can be improved evidently by using ultrasonic impact treatment. The surface microstructure of the rail steel could be refined and the hardness and wear resistance of impact layer were significantly improved through the ultrasonic impact technology. The longer the impact time, the greater increasing range of hardness and wear resistance will be. Compared to the sample without treatment, its surface hardness was increased 23.6％、 32.9％、 43.1％,48.1％, respectively, and the wear resistance was also increased 30.6％、 32.7％、 42.9％、 57.1％, respectively, when the impact time was 3、 6、 15 、 30min, respectively.
U70 rail steel ultrasound impact microstructure hardness wear resistance
HE Bo-lin YU Ying-xia SHI Jian-ping
College of Mech.and Elec.Eng.,East-China Jiaotong University,Nanchang 330013,China China academy of railway sciences,Beijing 100081 China
国际会议
The Fourth Asian Conference on Heat Treatment and Surface Engineering(第四届亚洲热处理及表面工程大会)
北京
英文
130-134
2009-10-27（万方平台首次上网日期，不代表论文的发表时间）