27SiMn钢表面激光熔覆铁基合金组织和耐磨性分析

郭卫; 李凯凯; 柴蓉霞; 张丽苹; 张传伟

doi:doi:10.14128/j.cnki.al.20183803.351

应用激光, 2018, 38 (3): 351, 网络出版: 2018-08-24

27SiMn钢表面激光熔覆铁基合金组织和耐磨性分析

Analysis of Microstructure and Wear Resistance of Fe-based Alloy on 27SiMn Steel Surface by Laser Cladding

论文大纲

郭卫 ^*李凯凯柴蓉霞张丽苹张传伟

作者单位

西安科技大学机械工程学院, 陕西西安 710054

激光熔覆显微组织显微硬度磨损率磨损形貌 laser cladding microstructure microhardness wear rate wear morphology

摘要

针对液压支架立柱易出现点蚀、磨损等问题, 采用激光熔覆技术在液压支架立柱母材27SiMn钢表面制备了铁基合金熔覆层, 并分析了熔覆后试样的显微组织、显微硬度、磨损率以及磨损形貌。结果表明, 熔覆层和基体之间实现了良好的冶金结合, 熔覆层的上部的组织较为致密, 晶粒细小, 中部和底部主要是具有典型定向凝固特征的柱状晶, 晶粒较为粗大。熔覆层、热影响区以及基体材料的显微硬度逐渐减小, 显微硬度曲线呈台阶状分布。在定载荷情况下, 随着摩擦速度的增大, 试样的磨损率先增大后减小; 在定转速情况下, 试样的磨损率随着载荷的增加呈现缓增到激增的趋势。熔覆层的磨损形貌表明其磨损机制主要是磨粒磨损、粘着磨损和剥落磨损。

Abstract

Focus on the issues of pitting corrosion and wear of hydraulic support columns, the Fe-based alloy coating was prepared on the surface of hydraulic support column base material(27SiMn)by laser cladding technology, and microstructure, microhardness, wear rate and wear morphology of the sample after the cladding were studied. The results show that a good metallurgical bonding between the cladding layer and the substrate is obtained. The upper part of the cladding layer is dense and the grains are small. The center and the bottom of the cladding layer are mainly columnar crystals with typical directional solidification characteristics and the grains are coarse. The microhardness of the cladding layer, heat affected zone and substrate material is gradually decreased, and the microhardness curve is distributed stepwise. Under constant load conditions, the wear rate of the specimen increases first and then decreases with the increase of the friction speed. Under the condition of constant speed, the wear rate of the specimen show a trend of increasing slowly to sharply with the increase of the load. The wear morphology of the cladding shows that its wear mechanisms are mainly abrasive wear, adhesive wear, and delamination wear.

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郭卫, 李凯凯, 柴蓉霞, 张丽苹, 张传伟. 27SiMn钢表面激光熔覆铁基合金组织和耐磨性分析[J]. 应用激光, 2018, 38(3): 351. Guo Wei, Li Kaikai, Chai Rongxia, Zhang Liping, Zhang Chuanwei. Analysis of Microstructure and Wear Resistance of Fe-based Alloy on 27SiMn Steel Surface by Laser Cladding[J]. APPLIED LASER, 2018, 38(3): 351.

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