感应温度对激光固态相变U75V滚动接触疲劳影响研究  

Impact of Induction Temperature on Rolling Contact Fatigue in Laser Solid⁃State Phase Transformation of U75V

作　　者：丁孝禹 王伟桂 余杭 陈智君 张群莉[1,2,5] 方津 姚建华[1,2,3] Ding Xiaoyu;Wang Weigui;Yu Hang;Chen Zhijun;Zhang Qunli;Fang Jin;Yao Jianhua(Institute of Laser Advanced Manufacturing,Zhejiang University of Technology,Hangzhou 310023,Zhejiang,China;Special Purpose Equipment and Advanced Manufacturing Technology,Ministry of Education,Zhejiang Provincial Key Laboratory,Hangzhou 310023,Zhejiang,China;Department of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310023,Zhejiang,China;Zhejiang Bell Railway Equipment Co.,Ltd.,Longyou 324400,Zhejiang,China;Eco-Industrial Innovation Institute ZJUT,Longyou 324400,Zhejiang,China)

机构地区：[1]浙江工业大学激光先进制造研究院,浙江杭州310023 [2]特种装备制造与先进加工技术教育部/浙江省重点实验室,浙江杭州310023 [3]浙江工业大学机械工程学院,浙江杭州310023 [4]浙江贝尔轨道装备有限公司,浙江龙游324400 [5]衢州市浙工大生态工业创新研究院,浙江龙游324400

出　　处：《中国激光》2024年第12期114-126,共13页Chinese Journal of Lasers

基　　金：浙江省“尖兵”研发攻关计划项目(2022C03021,2023C01064);龙游县重大科技攻关课题(JHXM2023072);浙江省博士后科研项目择优资助(ZJ2023015)。

摘　　要：滚动接触疲劳(RCF)是轮轨系统的主要失效模式。采用激光固态相变工艺(将激光与感应加热相结合),对U75V钢表面进行强化处理,然后利用平面式滚动接触疲劳试验机进行滚动接触疲劳性能测试,研究感应温度对U75V钢轨滚动接触疲劳性能的影响,并结合有限元分析研究U75V钢的疲劳损伤机理。结果表明,材料的疲劳损伤形式主要与感应温度有关:未处理试样和感应温度为550℃的试样均以疲劳点蚀损伤为主,裂纹从材料表面萌生并逐渐向材料内部扩展;感应温度为520℃和490℃的试样以疲劳剥落损伤为主。对比试验结果与有限元分析结果可以发现,裂纹从材料次表面萌生,随后在剪切应力的作用下逐渐向材料表面及材料更深处扩展。Objective U75V is one of the major rails of heavy railway transportation in China.Owing to increasingly harsh service conditions,wheel‒rail rolling contact fatigue(RCF)has become the major failure mode of the wheel‒rail system.This requires the rail to have high strength,wear resistance,and good rolling contact fatigue performance.The surface properties of materials are essential in the rolling contact fatigue performance,and the fatigue life can be effectively enhanced by rational surface treatment technology.Since the emergence of laser surface treatment technology in the 1970s,it has become the main means of material surface treatment owing to its wide application range and high processing efficiency.Laser transformation hardening is the most widely used among the various types of laser surface treatments.While this technique significantly improves the surface hardness of treated materials,it causes higher brittleness,which can decrease fatigue performance.This study adopts a new laser solid-state phase transformation process to enhance the surface quality of U75V steel by combining laser and induction as two heat sources.The main focus is the influence of different induction-holding temperature treatments on the rolling contact fatigue performance of the material’s strengthening layer.The principle is to regulate the proportion of microstructures in the material by changing the induction holding temperature.This paper analyzes the morphology of damage caused by the wheel‒rail rolling contact.It further explores the fatigue damage mechanism of U75V through a finite element simulation.Methods In this study,a sample of the U75V rail material after hot rolling with a geometric size of 300 mm×70 mm×30 mm was used as the substrate.Before the experiment,the surface oxide layer and rust stains were removed using pre-grinding and cleaned with alcohol.Moreover,a light-absorbing coating was uniformly applied to the processed surface to improve the laser absorption efficiency of the material.First,laser-inducti

关 键 词：激光固态相变 U75V钢轨 疲劳损伤 感应温度 

分 类 号：TG115.57[金属学及工艺—物理冶金]