液压立柱铁基合金激光熔覆层组织及耐腐蚀性能分析  

Analysis of Structure and Corrosion Resistance of Laser Cladding Layer of Iron-based Alloy on Hydraulic Column

作　　者：崔英浩 谢聪 崔陆军[1] 郭士锐[1] 张建龙 刘嘉霖 郑博 Cui Yinghao;Xie Cong;Cui Lujun;Guo Shirui;Zhang Jianlong;Liu Jialin;Zheng Bo(School of Mechanical&Electronic Engineering,Zhongyuan University of Technology,Zhengzhou,Henan 450007,China;Xian Special Equipment Inspection Institute,Xian,Shaanxi 710065,China)

机构地区：[1]中原工学院机电学院,河南郑州450007 [2]西安特种设备检验检测院,陕西西安710065

出　　处：《应用激光》2022年第3期8-14,共7页Applied Laser

基　　金：河南省科技攻关计划项目(202102210068);河南省高等学校重点科研项目(21A460036、20A460033、20A460031);中原工学院青年骨干教师资助(2021XQG07);中原工学院科研团队发展项目“激光增材制造技术团队”(K2021TD002);河南省研究生教育改革与质量提升工程项目(YJS2022AL057);河南省自然科学基金面上项目(212300410422);安徽理工大学矿山智能装备与技术安徽省重点实验室开放基金项目(KSZN202002003)。

摘　　要：为提升液压立柱27SiMn钢在矿井下的耐腐蚀性能,利用半导体光纤耦合激光器在27SiMn钢基材上进行铁基合金粉末多道搭接熔覆,对制得的铁基合金熔覆层横截面宏观形貌、显微组织、耐腐蚀等级和腐蚀机理进行研究分析。结果表明,在以稀释率为主要考虑指标,2 000 W的激光功率、15 g/min的送粉速率、6 mm/s的扫描速度和50%搭接率的工艺参数下,可以制得最佳稀释率和宏观形貌良好的熔覆层。熔覆层中上部生长的树枝晶具有明显的方向性,熔覆层的耐腐蚀等级相较于基材提升了2级,重度腐蚀区为晶间腐蚀,耐腐蚀性能相较于基材显著提升。研究对液压立柱修复强化工程实践具有重要指导意义。To improve the erosion resistance of the Hydraulic pillar 27 SiMn steel in the underground coal mine, a semiconductor fiber coupled laser was adopted to perform multi-pass lap cladding of iron-based alloy powder on the 27 SiMn steel substrate, and the transverse of the obtained ferrous alloy study on cladding layer and analysis of macro-profile, microscopic structure, micro hardness, erosion resistance grade and mechanism of erosion. Results show that the dilution rate is the main consideration index. Under the process parameters of 2 000 W laser power, 15 g/min powder feeding rate, 6 mm/s scanning speed and 50% overlap rate, the best dilution rate and cladding layer with good macro morphology can be obtained. The dendrites grown in the upper part of the cladding layer will have obvious directionality. The erosion resistance level of the cladding layer is improved by 2 levels compared to the base material. The Heavily corroded area is intergranular erosion. Erosion resistance is obviously improved compared to the matrix material. This research has important guiding significance for the hydraulic column repair and strengthening engineering practice.

关 键 词：液压立柱 激光熔覆 显微组织 腐蚀机理 

分 类 号：TP174.4[自动化与计算机技术—控制理论与控制工程]