微合金化钢轨淬火工艺的优化及其疲劳裂纹扩展行为研究

doi:10.3901/JME.2022.14.233

机械工程学报 ›› 2022, Vol. 58 ›› Issue (14): 233-240.doi: 10.3901/JME.2022.14.233

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微合金化钢轨淬火工艺的优化及其疲劳裂纹扩展行为研究

陈林¹, 戴宇恒¹, 崔健伟², 周庆飞¹, 岑耀东¹

1. 内蒙古科技大学材料与冶金学院包头 014010;
2. 内蒙古第一机械集团有限公司包头 014032

收稿日期:2021-01-03 修回日期:2021-11-09 出版日期:2022-07-20 发布日期:2022-09-07
通讯作者: 陈林(通信作者)，男，1963年出生，硕士，教授，硕士研究生导师。主要研究方向为稀土在钢中的应用，轧钢生产新工艺、新技术以及材料加工数值模拟及组织控制。E-mail：chenlin39805@163.com
基金资助:
国家自然科学基金(51361021)、内蒙古自治区科技重大专项(ZDZX2018024)、内蒙古自然科学基金(2019LH05016)、内蒙古自治区高等学校科学技术研究(NJZY20089)和内蒙古科技大学创新基金(2019QDL-B06)资助项目。

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

CHEN Lin¹, DAI Yuheng¹, CUI Jianwei², ZHOU Qingfei¹, CEN Yaodong¹

1. School of Material and Metallurgy, Inner Mongolia University of Science & Technology, Baotou 014010;
2. Inner Mongolia First Machinery Group Corporation, Baotou 014032

Received:2021-01-03 Revised:2021-11-09 Online:2022-07-20 Published:2022-09-07

摘要/Abstract

摘要： 为定量化分析微合金化与淬火工艺、裂纹扩展的关联性，寻找修正钢轨淬火时所产生自回火现象的方法，通过对GGX-G重轨钢和自行开发设计的微合金元素重轨试验钢在8℃/s淬火冷速与8℃/s淬火冷速自回火后展开疲劳裂纹扩展试验，结果表明：未热处理态下，试验钢疲劳寿命优于GGX-G钢11万次；在经8℃/s冷速及8℃/s冷速自回火工艺后，由77万次均提升至107万次，自回火未影响试验钢的疲劳寿命，仍有良好的疲劳性能；淬火后试验钢在Ⅱ区均出现的慢速扩展区，且自回火后试验钢的△K范围更高，微合金化后的钢轨对自回火所造成的疲劳性能降低有着优良的抗性；淬火工艺后的试验钢均优于国标要求，且8℃/s淬火冷速与8℃/s淬火冷速自回火的疲劳断口未见差异，同样表明自回火对试验钢的综合疲劳性能影响甚微，有着良好的抗自回火能力。通过向钢轨中添加一定的微合金元素，不仅提升了淬火后钢轨的疲劳性能，同时也修正了自回火对钢轨性能的影响。

关键词: 合金元素, 重轨钢, 淬火工艺, 自回火, 裂纹扩展

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

中图分类号:

TG142

陈林, 戴宇恒, 崔健伟, 周庆飞, 岑耀东. 微合金化钢轨淬火工艺的优化及其疲劳裂纹扩展行为研究[J]. 机械工程学报, 2022, 58(14): 233-240.

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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微合金化钢轨淬火工艺的优化及其疲劳裂纹扩展行为研究

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

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