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研究了用双筒送粉器分别输送Stellite 6和WC ,WC体积含量分别为 0 % ,9% ,18% ,2 7% ,36 % ,45 % ,5 4% ,72 %和 10 0 %的高功率CO2 激光熔覆特性及其演变。结果表明 ,当WC体积低于18%时 ,激光熔覆不出现裂纹。WC体积分数进一步增加 ,熔覆层平均硬度和裂纹率增加而高宽比减小。显微组织演变可分为两段 :WC体积从 0 %到 36 %为第一段 ,WC完全熔化并溶解 ,凝固组织主要由枝晶和枝晶间共晶组成 ,W含量分别为 9 6 8%和 2 1%。WC体积分数从 45 %到 10 0 %时为第二段 ,大部分WC熔化和溶解 ,显微组织主要由基体和沉淀于其中的W化合物组成 ,溶解于基体的最大W含量为 2 6 %左右。混合粉末中WC越多 ,W在W化合物中的含量也越多 ,其最高含量可达到6 4 5 5 %
Abstract：Laser cladding of Stellite+WC with WC volume rate of 0%, 9%, 18%, 27%, 36%, 45%, 54%, 72%, and 100% was investigated by dual powder feeding. The results demonstrated that no cracking happened until WC volume rate over 18%. The average hardness and cracking rate increased while height/width rate decreased with the increase of WC volume rate. The microstructure evolution can be divided into two domains. The first domain refers to WC volume rate from 0% to 36%, the WC added was completed melted and resolved into the melt pool and the re solidified structure dominated by the dendrite and interdendrite eutectic with W content respectively 9 68% and 21%. The second domain related to WC volume rate from 45% to 100%, in which most of the WC was melted and resolved, the microstructure dominated by the matrix and W compounds precipitated over it. The dissolution of W into the matrix was limited to maximum about 26%. The more the WC volume rate in the mixed powder, the more the precipitated W compound and the more W content within the W compound, which finally reached to 64 55%.
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基本信息:
DOI：
中图分类号:TG156.99
引用信息:
[1]钟敏霖,刘文今,陈艳霞,宁国庆.斯太立合金加WC激光熔覆[J].金属热处理学报,2001(02):27-31.
基金信息: