王家胜,舒林森,巩江涛,张朝铭

• 1:陕西理工大学机械工程学院
• 2:陕西省工业自动化重点实验室

摘要(Abstract)：

为实现损伤液压支架立柱的再制造修复，采用激光熔覆技术在液压支架立柱材料27SiMn钢表面制备Ni60合金涂层。通过正交试验法研究激光工艺参数对涂层稀释率的影响规律并确定最优工艺参数。利用超景深显微镜、显微硬度计及摩擦磨损试验机等分析了涂层的显微组织、硬度及耐磨性能。结果表明，影响熔覆层稀释率的因素由大到小依次为：激光功率>扫描速度>送粉速度>离焦量。以稀释率为指标的最佳工艺参数组合为A_1B_3C_3D_3,即激光功率为1500 W、扫描速度为22 mm/s、离焦量为+1 mm、送粉速度为12 g/min。熔覆层整体晶粒细小均匀，涂层上部主要由等轴晶组成，中部主要由等轴晶和树枝晶组成，下部则主要由沿熔合界面生长的胞状晶及柱状晶组成。熔覆层的平均硬度值为729.5 HV0.5,是基体硬度的2.32倍，最高硬度出现在熔覆层顶部的等轴晶区，为756.9 HV0.5。熔覆层的显微硬度压痕棱边平直、四角光滑无裂纹，具有良好的韧性。熔覆层的摩擦系数明显低于基材，且稳定性好于基材，磨损量仅为基材的58%,熔覆层的磨损机制为磨粒磨损和轻微的黏着磨损。

关键词(KeyWords)： 液压支架;激光熔覆;Ni60;硬度;耐磨性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(5105268);; 陕西省教育厅一般专项科研计划项目(22JK0312);; 陕西理工大学科研基金项目(SLG2123)

作者(Author): 王家胜,舒林森,巩江涛,张朝铭

DOI: 10.13289/j.issn.1009-6264.2023-0175

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