【作者】 陈传忠； 陈鹭滨； 张淑娟； 雷延权；

【Author】 CHEN Chuanzhong CHEN Lubin (Shandong University of Technology) ZHANG Shujuan(Jinan Mechanical College of Staff and Workers)LEI Tingquan (Harbin Institute of Technology)

【机构】 山东工业大学； 济南机械职工大学； 哈尔滨工业大学；

【摘要】 采用X射线、扫描电镜、透射电镜及选区电子衍射等手段研究了45钢表面WC/Ni金属陶瓷激光涂覆层的组织结构及形成机制。试验结果表明,熔覆层由未熔的WC颗粒、颗粒间的粘结相γ-Ni基固溶体及少量γ-Ni+M₆C共晶组成;熔覆层的组织形貌受参量G/v（温度梯度/凝固速度）及涂层的成分分布特征控制。更多还原

【Abstract】 Microstructure and formation mechanism of laser cladded WC/Ni metal ceramics on 45 steel has been investigated with X-ray, scanning electron microscopy, transmitting electron microscopy and selected area electronic diffraction techniques, etc. Results show that the laser cladded coating exhibits unmelted WC grains,intergranular Y-Ni based solid solution as the adhesion phase,and a small amount of Y-Ni + M6C eutectic; the microstructural morphology of the laser cladded coating is controlled by the ratio of the temperature gradient to solidification speed, G/u, and distribution characteristics of the chemical composition in the coating.更多还原