摘要
为提高物流机器人机械臂用铝合金的硬度和拉伸性能,单道熔覆WC-Ni涂层对比分析熔覆层的形貌和硬度,并在拉伸棒表面进行多道熔覆制备拉伸试样。结果显示,随着激光功率的增大,单道熔覆层高度先增大后减小,熔池深度增大,熔覆层宽度增大,稀释率先减小后增大,当激光功率为1.0 kW时单道熔覆层稀释率达到最小,与基体结合强度达到最大,冶金结合效果较优。熔覆层有新相W_(2)C、NiAl、Ni_(3)Al、M_(7)C_(3)、M_(23)C_(6)生成,熔覆层顶部由胞状晶组成,中部存在大量WC颗粒和M_(7)C_(3)、M_(23)C_(6)析出相,结合区主要由具有方向性的树枝晶组成。单道熔覆层HV硬度先增大后减小,最大值为960.6,多道抗拉强度为313 MPa,延伸率为1.3%,相比于基体分别提高了21.8%和降低了27.8%,多道熔覆层与基体之间的拉伸断口较平坦。
To improve the hardness and tensile properties of aluminum alloy for logistics robots’mechanical arms,a single WC-Ni cladding layer was prepared.Its morphology and hardness were compared and analyzed,and the tensile samples were prepared by a multicladding layer on the surface of the tensile rod.The results showed that with laser power increasing,the height of a single cladding layer first increased and then decreased,the depth of the molten pool increased,the width of the cladding layer increased,and the dilution first decreased and then increased.When the laser power was 1.0 kW,the dilution rate of a single cladding layer reached the minimum,the bonding strength with the matrix reached the maximum,and the metallurgical bonding effect was the best.There were new phases W_(2)C、NiAl、Ni_(3)Al、M_(7)C_(3) and M_(23)C_(6) in the cladding layer,the top of which was composed of cellular crystals.In the middle there were a large number of WC particles,and M_(7)C_(3) and M_(23)C_(6) precipitated phases.The bonding zone was mainly composed of directional dendrites.The HV hardness of a single cladding layer first increased and then decreased,and the maximum value was 960.6.The tensile strength and elongation of the multicladding layer were 313 MPa and 1.3%respectively,which were 21.8%higher and 27.8%lower than those of the matrix.The tensile fracture between the multicladding layer and the substrate was smooth.
作者
佟静
苏翀
TONG Jing;SU Chong(Intelligent Manufacturing Institute,Nanjing Polytechnic Institute,Nanjing 211500,China;School of Computer Science,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)
出处
《有色金属科学与工程》
CAS
北大核心
2022年第6期84-90,共7页
Nonferrous Metals Science and Engineering
基金
2022年度江苏高校哲学社会科学研究一般项目(2022SJYB0776)
中国博士后科学基金项目(2016M600430)。
关键词
激光熔覆
机器人
微观组织
硬度
拉伸性能
laser cladding
robots
microstructure
hardness
tensile properties
