【摘要】 采用 6kWCO2 激光器和同步送粉熔覆技术 ,在低合金结构钢 2 0CrMo上成功地获得大面积的钴基合金涂层。通过金相显微镜 ,X射线衍射技术对熔覆层的组织进行了分析 ,并测试了显微硬度、抗弯强度、耐蚀性能。结果表明 ,钴基合金涂层组织细密 ,是由Co过饱和固溶体 ,CrB ,M2 3 C6等相组成 ,与硬质合金热轧辊相比 ,其硬度略微提高 ,抗弯强度相当 ,耐腐蚀性能更为优越更多还原

【Abstract】 A large area of Co based alloy coatings on alloy struction steel 20CrMo has been successfully obtained by using a 6 kW CO 2 laser and synchronous powder feeding system. By means of metalloscopy and X ray diffraction, the microstructure of the coating is investigated. The microhardness, bending strength and corrosion resistance are measured. The experimental results show that the cladding layer is of fine dendritic microstructure, the phases of coating are composed of Co based solid solution,CrB,M 23 C 6 et al.. Compared with cemented carbide hot roller presently, the cladding layer has a little higher microhardness, equivalent bending strength and improved corrosion resistance.更多还原