(浙江大學 硅材料國家重點實驗室， 杭州 310027)
摘 要: 在不預熱情況下，通過調(diào)整熔敷金屬Cu和Ni的含量， 改變鑄鐵激光熔敷層內(nèi)奧氏體相與滲碳體相體積分數(shù)，分析了奧氏體相體積分數(shù)對熔敷層抗裂性的影響。在最佳激光熔敷工藝參數(shù)基礎(chǔ)上，研究了Cu和Ni對熔敷層奧氏體體積分數(shù)、表面裂紋率及表面耐磨性的影響。獲得的未裂臨界熔敷層面積為55.1cm2，其對應(yīng)熔敷材料為Cu-Ni-C-Si-Fe。以此熔敷材料為基礎(chǔ)，改變V含量， 在熔敷層得到原位自生V2C。研究了V2C對熔敷層耐磨性的影響，分析了V2C對熔敷層硬度及磨損質(zhì)量損失的影響規(guī)律，最終獲得了可顯著提高熔敷層抗裂性及耐磨性的Cu-Ni-V-C-Si-Fe熔敷材料。
關(guān)鍵字: 激光熔敷層； 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
