扫描速度对42CrMo表面激光熔覆NiCrBSi熔覆层成形的影响  

Influence of Scanning Speed on Forming of Ni Cr BSi Composite Coating on 42Cr Mo Steel by Laser Cladding

作　　者：符定梅[1] 王开明[2] FU Dingmei WANG Kaiming(LZhongye Central Research Institute for Building＆Gonstruction Ltd., Beijing 100088, China School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China)

机构地区：[1]中冶建筑研究总院有限公司,北京100088 [2]北京工业大学材料科学与工程学院,北京100124

出　　处：《机械工程师》2017年第8期97-100,共4页Mechanical Engineer

摘　　要：通过使用6 k W光纤激光器在42Cr Mo钢表面激光熔覆Ni Cr BSi合金涂层,研究了激光扫描速度对Ni Cr BSi熔覆层的宏观成形、显微组织和硬度的影响。采用金相显微镜、扫描电镜、显微硬度计等,对熔覆层的宏观尺寸、显微组织和硬度等进行了测试分析。结果表明,随着激光扫描速度的增加,熔覆层的熔宽、熔高、熔深和热影响区宽度都降低,熔覆层的稀释率稍有增加;熔覆层与基体为良好的冶金结合,熔覆层的组织随着扫描速度的增加得到细化,熔覆层的硬度先增加然后降低。Laser clad NiCrBSi composite coating is fabricated on 42CrMo steel surface using a 6 kW fiber laser. The macroforming, microstructure and hardness of NiCrBSi composite coating under different laser scanning speed are studied. The marco-size, microstructure and hardness of the cladding layer are measured and analyzed by optical microscopy （ OM）, scanning electron microscopy （ SEM） and microhardness tester. The results show that the melting width, melting height, the depth of penetration and the width of HAZ of the cladding layer decrease with the increase of the laser scanning speed, and the dilution rate of the cladding layer increases slightly. The cladding layer has good metallurgy with the substrate. The microstructure of the cladding layer is refined with the increase of the scanning speed, and the hardness of the cladding layer firstly increases and then decreases.

关 键 词：激光熔覆 扫描速度 42Cr Mo钢 尺寸 成形 

分 类 号：TG456.7[金属学及工艺—焊接]