(浙江大学 硅材料国家重点实验室， 杭州 310027)
摘 要: 在不预热情况下，通过调整熔敷金属Cu和Ni的含量， 改变铸铁激光熔敷层内奥氏体相与渗碳体相体积分数，分析了奥氏体相体积分数对熔敷层抗裂性的影响。在最佳激光熔敷工艺参数基础上，研究了Cu和Ni对熔敷层奥氏体体积分数、表面裂纹率及表面耐磨性的影响。获得的未裂临界熔敷层面积为55.1cm2，其对应熔敷材料为Cu-Ni-C-Si-Fe。以此熔敷材料为基础，改变V含量， 在熔敷层得到原位自生V2C。研究了V2C对熔敷层耐磨性的影响，分析了V2C对熔敷层硬度及磨损质量损失的影响规律，最终获得了可显著提高熔敷层抗裂性及耐磨性的Cu-Ni-V-C-Si-Fe熔敷材料。
关键字: 激光熔敷层； Ni； Cu； 原位自生V2C； 抗裂性； 耐磨性
（State Key Laboratory of Silicon Materials，
Zhejiang University， Hangzhou 310027， China）
Abstract:In the condition of no preheating, the contents of Cu and Ni in Cu-Ni-V-C laser cladding layers were changed to adjust the volume fractions of austenite and cementite, and the effect of volume fraction of austenite on the cracking resistance was analyzed. Based on optimized parameters of laser processing, effects of Cu and Ni on the volume fractions of austenite, cracking ratio of clad layers, and wear resistance were systematically investigated. It is found that the critical no-cracking overlapping area of clad layers is 55.1cm2, and the corresponding cladding material is the Cu-Ni-C-Si-Fe alloy. Using this cladding material, the effect of V on the wear resistance of cladding layer was investigated. The influence of endogenous V2C on the surface hardness and wear resistance of clad layers was analyzed. As a result, a Cu-Ni-V-C-Si-Fe cladding material with high cracking and wear resistance was obtained.
Key words: laser cladding layer； Ni； Cu； endogenous V2C； cracking resistance； wear resistance
