摘要
为了提高矿用液压支架立柱修复表面的硬度与耐磨性,利用激光熔覆技术在液压支架立柱母材27SiMn钢表面进行了不同激光扫描速度下的单道激光熔覆铁基合金实验,对比分析不同扫描速度下的单道熔覆层宏观形貌;随后在不同扫描速度下进行多层累加激光熔覆铁基合金实验,分析不同扫描速度下27SiMn钢基体和铁基合金熔覆层的微观组织形貌、显微硬度和力学性能;进行耐磨性能实验,研究不同滑动速度和载荷对熔覆层耐磨性的影响。结果表明,熔覆层和基体之间能实现良好的冶金结合,熔覆层组织中呈现出了具有典型定向凝固特征的柱状晶;熔覆层的显微硬度、抗拉强度及耐磨性均高于基体。
In order to improve the hardness and wear resistance of the repaired surface of the mine hydraulic support column,laser cladding technology was used to conduct a single-pass laser cladding Fe-based alloy experiment under different laser scanning speeds on the 27 SiMn steel surface(the base material of the hydraulic support column).Compared and analyzed on the macro morphology of the single-pass cladding layer under the different scanning speeds.Then the experiment of multi-layer cumulative of laser cladding iron-based alloy were carried out under the different scanning speeds to analyze the microstructure morphology,the micro-hardness and mechanical properties of 27 SiMn steel matrix and iron-based alloy cladding layer under the different scanning speeds.The experiment of wear resistance was conducted on study the influence of sliding speed and load on the wear resistance of the cladding layer.The results show that a good metallurgical bond can achieved between the cladding layer and the substrate,and the structure of the cladding layer presents columnar crystals with typical directional solidification characteristics.The micro-hardness,tensile strength and wear resistance of the cladding layer are all higher than the substrate.
作者
赵栓峰
郭颖潇
柴蓉霞
苗垚
Zhao Shuanfeng;Guo Yingxiao;Chai Rongxia;Miao Yao(College of Mechanical Engineering,Xi′an University of Science and Technology,Xi′an,Shaanxi 710054)
出处
《应用激光》
CSCD
北大核心
2020年第5期811-820,共10页
Applied Laser
基金
陕西省自然科学基础研究计划资助项目(项目编号:2020JM-529)
关键词
激光熔覆
扫描速度
显微组织
显微硬度
拉伸性能
耐磨性能
laser cladding
scanning speed
microstructure
micro hardness
tensile properties
abrasion resistance
