中国激光, 2018, 45 (4): 0402005, 网络出版: 2018-04-13
激光熔覆W-Cu复合材料的组织形貌与工艺参数的相关性 下载: 777次
Correlation between Process Parameters and Microstructure Morphologies of W-Cu Composites Fabricated by Laser Cladding
激光技术 激光熔覆 同轴送粉 W-Cu复合材料 有效质量能量密度 laser technique laser cladding coaxial powder feeding W-Cu composites effective mass energy density
摘要
采用同轴送粉法进行了W-Cu复合粉末的激光熔覆实验, 研究了不同工艺参数对单道熔覆层几何特性和颗粒分布的影响, 提出了有效质量能量密度(k)概念。结果表明, 在单道熔覆实验加工体系下, 熔覆层的散逸能量密度约为3.5×10-3 kJ·mm-2。在一定加工条件下, 熔覆层中存在有效质量能量密度临界值(k′), 当k>k′时, 熔覆层中可以形成稀释区; 随着k值的减小, 熔覆层内的W颗粒发生团簇→均匀分布→沿熔覆层边缘分布→“W包Cu”不同状态的变化。单道多层熔覆时, k值受单道熔覆层形状的影响较大, 熔覆层宽高比越小, 实际的k值和试样的相对致密度越小。
Abstract
The laser cladding of W-Cu composite powders is conducted by the coaxial powder feeding method and the influences of different process parameters on the geometrical characteristics and the particle distributions of single-track cladding layers are investigated. A concept of effective mass energy density (k) is also proposed. The results show that, in the experimental fabrication system with single-track cladding, the dissipation energy density of cladding layers is approximatively 3.5×10-3 kJ·mm-2. Under the certain fabrication conditions, there exists a critical value k′ of effective mass energy density in cladding layers. A dilution zone can be formed in the cladding layers when k>k′. With the decrease of k, as for the W particles in cladding layers, the successive change from agglomerate to uniform distribution, distribution along the edge of cladding layer, and W-rim/Cu core structure occurs. For a single track multi-layer cladding, the value of k is significantly affected by the shape of the single-track cladding layer. The smaller the width-height ratio of cladding layer is, the smaller the actual k value and the relative density are.
顾赛男, 王广原, 秦渊, 杨森. 激光熔覆W-Cu复合材料的组织形貌与工艺参数的相关性[J]. 中国激光, 2018, 45(4): 0402005. Gu Sainan, Wang Guangyuan, Qin Yuan, Yang Sen. Correlation between Process Parameters and Microstructure Morphologies of W-Cu Composites Fabricated by Laser Cladding[J]. Chinese Journal of Lasers, 2018, 45(4): 0402005.