激光熔覆原位自生TiB2/Ni金属陶瓷复合涂层的裂纹研究
Study on Cracks of In-situ Synthesized TiB2 /Ni Cermet Composite Coating by Laser Cladding
汪新衡1, 匡建新1, 朱航生2
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作者单位：(1. 湖南工学院 机械工程系, 湖南 衡阳 421002; 2. 衡阳丰顺车桥有限公司产品部, 湖南 衡阳 421002)
中文关键字：激光熔覆； 原位自生； 金属陶瓷涂层； 残余应力； 裂纹
英文关键字：aser cladding; in-situ; cermet coating; residual stress; cracks
中文摘要：用激光熔覆技术在45钢表面制备了不同成分配比的原位自生TiB2 /Ni金属陶瓷复合涂层，研究了涂层的残余应力分布和开裂行为。结果表明：裂纹源产生的部位主要是熔敷层中的硬质相夹杂物、熔覆层中共晶团间显微孔和熔覆层与基材界面间的微孔洞。
英文摘要：Abstract：In-situ synthesized TiB2 /Ni cermet composite coatings with different compositions were fabricated on 45 steel using laser cladding. The residual stress and cracks in different coatings were studied by micro-analysis. The results show that the sites of cracks source are mainly in the hard phase, the inclusions of the cladding layer, the micro-holes between eutectics in the cladding layer and the micro-holes between cladding layer and substrate .