摘要
本文报导应用横流式连续CO_2激光器,采用不同激光扫描速度,对熔覆Stellite 12钴基硬面合金的合金层的相组成、微观组织结构对耐磨性和显微硬度影响的研究结果。表明:(1)激光熔覆合金层是由过饱和的γ(Co,Cr)基体相和复杂的六方M_7C_3碳化物相所组成(2)在其他参数不变的情况下,随激光扫描速度的提高,γ(Co,Cr)基体相过饱和度增大,而析出的碳化物含量减少,因而合金层的硬度升高,耐磨性有所下降;而降低激光的扫描速度,碳化物M_7C_3析出增加,有利于提高合金层的耐磨性、因此碳化物M_7C_3析出量是提高耐磨性的主要因素,而增加基体相γ(Co,Cr)
Effect of laser scanning speed on phase constitution, microstructure,microhardness and wear resistance of laser-cladding stellite hard facing alloy by using of across-flow-stype CO_2 laser of power 1. 5 kW has been investigated. The laser-cladding layeron the alloy consists of matrix phase of over-saturation solid solution γ(Co, Cr) and complexhexagonal carbide M_7C_3. Under certain condition, with fast laser scanning speed, the oversaturation solubility of elements increases in γ(Co, Cr), and the precipitation of the complexcarbide M_7C_3 decreases, so that the microhardness increases and the wear resistance de-creases. But at slower laser scanning speed, more complex carbide M_7C_3 may precipitate, andthe wear resistance may be improved. Therefore, it is believed that the principal factor in im-provement over wear resistance is the precipitation of carbide M_7C_3, while overmicrohardness is the over-saturation solubility of elements in matrix phase (Co, Cr).
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第3期A126-A130,共5页
Acta Metallurgica Sinica
关键词
激光熔覆
硬面合金
相组成
耐磨性
laser-cladding
Stellite hard facing alloy
phase constitution
wear resistance
