Effect of transfer arc current on microstructures and properties of plasma transfer arc surfacing WC_p/Ni60 composite layers

电流对等离子堆焊WC p /Ni60复合层组织与性能的影响 Effect of transfer arc current on microstructures and properties of plasma transfer arc surfacing WC p /Ni60 composite layers 郭洋 GUO Yang 1 2 3 first-author 陈兴东 CHEN Xingdong 2 黄岚 HUANG Lan 2 范华 Fan Hua 1 2 张建勋 ZHANG Jianxun 3 长寿命高温材料国家重点实验室 长寿命高温材料国家重点实验室 State Key Laboratory of Long-Life High Temperature Materials State Key Laboratory of Long-Life High Temperature Materials 东方电气集团东方汽轮机有限公司 东方电气集团东方汽轮机有限公司 Dongfang Electric Corporation Dongfang Turbine Co.,Ltd. Dongfang Electric Corporation Dongfang Turbine Co.,Ltd. 西安交通大学 西安交通大学 Xi’An Jiaotong University Xi’An Jiaotong University 分析不同转移弧电流下等离子堆焊制备的WC p /Ni60复合层的组织与硬度,研究转移弧电流对WC p /Ni60复合层的影响。通过控制转移弧电流,在Q235碳钢板上等离子堆焊Ni60+25%WC（铸造）粉末,在合理的工艺条件下获得了成形良好、无裂纹的等离子熔覆层;熔覆层硬度与等离子堆焊的转移弧电流的大小成正相关,当转移弧电流控制在135 A时,硬度达到590 HV5以上。不同转移弧电流下等离子堆焊WC p /Ni60复合熔覆层均出现了明显的分层现象,上层镍基固溶体与镍基共晶组织分布着粗大星状和针状Cr 23 C 6 ,下层中WC颗粒在截面面积比例由165 A下的约15%增加到135 A电流下的约40%。 The microstructures and hardness of nickel-based WC p /Ni60 composite layers prepared by plasma transfer arc surfacing with different transfer arc currents were analyzed to study the effect of transfer arc current on WC particles reinforced nickel-based（WC p /Ni60） composite layers. By controlling different transfer arc currents,Ni60 +25% WC（casting） powder was deposited on the Q235 carbon steel plate by plasma transfer arc surfacing,and well-formed and crack-free plasma deposition layers were successfully obtained under reasonable technological conditions;the hardness of the deposition layer was positively correlated with the transfer arc current of plasma surfacing,when the transfer arc current was135 A,the hardness was more than 590 HV5. The WC p /Ni60 composite layers of plasma surfacing under different transfer arc currents had obvious stratification phenomena. In the upper layers,the coarse star-shaped and needle-like Cr23 C6 were distributed in the nickel-based solid solution and nickel-based eutectic microstructures. The sectional area ratio of WC particles in the lower layers increased from about 15% at 165 A to about 40% at 135 A. WCp/Ni60复合层 等离子堆焊 转移弧电流 组织 熔覆层 TG455 2022-03-08 4 50