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

被引：0

作者：

Chen L. ^{[1
]}

Dai Y. ^{[1
]}

Cui J. ^{[2
]}

Zhou Q. ^{[1
]}

Cen Y. ^{[1
]}

机构：

[1] School of Material and Metallurgy, Inner Mongolia University of Science & Technology, Baotou

[2] Inner Mongolia First Machinery Group Corporation, Baotou

来源：

Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2022年 / 58卷 / 14期

关键词：

alloying element; crack propagation; heavy rail steel; quenching process; self-tempering;

D O I：

10.3901/JME.2022.14.233

中图分类号：

学科分类号：

摘要：

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. © 2022 Editorial Office of Chinese Journal of Mechanical Engineering. All rights reserved.

引用

页码：233 / 240

页数：7

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