面向盾构机密封跑道修复的激光熔覆Fe基涂层制备工艺

doi:10.13251/j.issn.0254-6051.2022.01.034

金属热处理 ›› 2022, Vol. 47 ›› Issue (1): 202-211.DOI: 10.13251/j.issn.0254-6051.2022.01.034

面向盾构机密封跑道修复的激光熔覆Fe基涂层制备工艺

卢庆亮¹, 王静¹, 戚小霞², 李燕乐², 李方义²

1.济南重工集团有限公司, 山东济南 250109;
2.山东大学机械工程学院高效洁净机械制造教育部重点实验室, 山东济南 250061

收稿日期:2021-07-07 修回日期:2021-09-13 出版日期:2022-01-25 发布日期:2022-02-18
作者简介:卢庆亮(1979—),男,博士,主要研究方向为材料加工工程,E-mail:13853145318@139.com
基金资助:
山东省重大科技创新工程项目(2019JZZY010428)

Preparation technology of laser clad Fe-based coating for shield sealing runway repair

Lu Qingliang¹, Wang Jing¹, Qi Xiaoxia², Li Yanle², Li Fangyi²

1. Jinan Heavy Industries Group Co., Ltd., Jinan Shandong 250109, China;
2. Key Laboratory of Efficient and Clean Machinery Manufacturing, Minsitry of Education, School of Mechanical Engineering, Shandong University, Jinan Shandong 250061, China

Received:2021-07-07 Revised:2021-09-13 Online:2022-01-25 Published:2022-02-18

摘要/Abstract

摘要： 为探究激光熔覆再制造修复工艺对盾构机密封跑道磨痕的修复效果,采用送粉式激光熔覆工艺在42CrMo钢基体表面制备了Fe55铁基自熔合金涂层。基于L₁₆(4³)正交试验探究了激光功率、熔覆速率和搭接率对涂层表面形貌、横截面特征参数、稀释率、显微组织、硬度的影响规律和作用机理。极差分析表明,稀释率随激光功率和熔覆速率的增加均呈上升趋势,其中激光功率对涂层硬度影响最大,最大涂层硬度约为基体硬度的2.15倍。Fe55涂层的摩擦因数较基体明显降低,涂层耐磨性优良,其磨损体积较基体降低1.09×10^-2 mm³,主要磨损机制为磨粒磨损和疲劳磨损。

关键词: 激光熔覆, 密封跑道, 再制造修复, 正交试验, 稀释率, 耐磨性

Abstract: To explore the effect of laser cladding remanufacturing on repair of the wear scar of the shield machine sealing runway, the Fe-based self-fusible alloy coating (Fe55) was prepared on 42CrMo steel substrate by powder feeding laser cladding process. Based on the L₁₆(4³) orthogonal experiment, the effects of laser power, cladding rate and over lap rate on surface morphology, cross section characteristic parameters, dilution rate, microstructure and hardness of the coating were investigated. The results of range analysis show that the dilution rate increases with the increase of laser power and cladding rate, among which the laser power has the greatest influence on coating hardness, and the maximum coating hardness is about 2.16 times of the matrix hardness. Fe-based coating can significantly reduce the friction coefficient of the matrix and has excellent wear resistance. Its wear volume is 1.09×10^-2 mm³ lower than that of the matrix. The main wear mechanism is abrasive wear and fatigue wear.

Key words: laser cladding, sealing runway, remanufactureing repair, orthogonal experiment, dilution rate, wear resistance

中图分类号:

TG178

卢庆亮, 王静, 戚小霞, 李燕乐, 李方义. 面向盾构机密封跑道修复的激光熔覆Fe基涂层制备工艺[J]. 金属热处理, 2022, 47(1): 202-211.

Lu Qingliang, Wang Jing, Qi Xiaoxia, Li Yanle, Li Fangyi. Preparation technology of laser clad Fe-based coating for shield sealing runway repair[J]. Heat Treatment of Metals, 2022, 47(1): 202-211.

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面向盾构机密封跑道修复的激光熔覆Fe基涂层制备工艺

Preparation technology of laser clad Fe-based coating for shield sealing runway repair

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