作　　者： ;

机构地区： 浙江大学

出　　处： 《材料热处理学报》 2016年第2期212-215,共4页

摘　　要： 在20钢基体上进行了激光熔覆0.8μm超细VC与Fe45合金粉末的实验,VC的百分含量分别为5%、10%、30%、50%。采用扫描电镜、维氏硬度计等设备检测了熔覆试样横截面的显微组织和性能。研究表明激光熔覆可以得到晶粒细化,析出相分布均匀,硬度高,与基体结合牢固的表面覆层;大部分VC在熔覆过程中熔化,在凝固过程中重新析出。随含量的不同,重新析出的VC分别呈现菊花状、树枝状、胞状形貌;Fe45熔覆层的平均硬度340 HV0.2,随着VC含量的增加,熔覆层平均硬度逐渐增加(530、615、833、987 HV0.2);随着VC含量的增加,单位时间内熔覆层的磨损失重逐渐减少,表明其耐磨损性能不断提高。 The microstructure and properties of VC-Fe composite coating prepared by laser cladding were researched. Vanadium carbide （VC） powder with the size of 0.8 μm and Fe-base alloy powder were used as cladding material. The content of VC was 5% , 10% , 30% and 50% , respectively. The results show that the metallurgical bonded cladding layers with the refined crystals, the unitorm distributed secondary phases and the higher hardness are prepared. Most VC powder is melt in the cladding process and then precipitated in the solidification process. With the different content of VC, the morphology of precipitated VC is presented as chrysanthemum-like, dendrite- like and cellular-like. The average hardness of Fe-base alloy cladding layer is 340 HV0.2. With the increasing of VC content, the average hardness of cladding layer is increased to 530, 615, 833 and 987 HV0.2 gradually and the wear-resistant of the cladding layer is improved synchronously.

关 键 词： 激光熔覆 显微组织 性能 铁基合金 碳化钒

领　　域： [金属学及工艺] [金属学及工艺]