Optimization of Quenching Process and Fatigue Crack Growth Behavior of Microalloyed Rail

doi:10.3901/JME.2022.14.233

Abstract

Abstract: In order to quantitative analysis of the correlation between microalloying with quenching process and crack growth, to find a way to correct the phenomenon of self-tempering during rail quenching, through the fatigue crack growth test of GGX-G heavy rail steel and self-developed and designed microalloyed element heavy rail experimental steel after quenching and cooling rate of 8℃/s and quenching and cooling rate of 8℃/s and self -tempering, the results show that under the condition of no heat treatment, the fatigue life of the experimental steel is better than that of GGX-G steel for 0.11 million times; after 8℃/s cold speed and 8℃/s cold speed self-tempering process, it has been increased from 0.77 million times to 1.07 million times, and self-tempering does not affect the fatigue life of the steel, and still has good fatigue performance; after quenching, there is a slow propagation zone in zone II of the experimental steel, and the △K range of the experimental steel is higher after self-tempering, the microalloyed rail has excellent resistance to the reduction of fatigue properties caused by self-tempering; the experimental steels after quenching process all meet the requirements of national standard, and the fatigue fracture surface of 8℃/s quenching cooling rate is similar to that of 8℃/s quenching cooling rate, which also indicates that self-tempering has little effect on fatigue properties of experimental steels, it has strong self-tempering resistance. The addition of microalloyed elements not only improves the fatigue performance of quenched rail, but also corrects the effect of self-tempering on rail performance.

Key words: alloying element, heavy rail steel, quenching process, self-tempering, crack propagation

CLC Number:

TG142

CHEN Lin, DAI Yuheng, CUI Jianwei, ZHOU Qingfei, CEN Yaodong. Optimization of Quenching Process and Fatigue Crack Growth Behavior of Microalloyed Rail[J]. Journal of Mechanical Engineering, 2022, 58(14): 233-240.

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