摘要
提出一种在轴类零件表面,通过激光熔覆技术制备颗粒增强的Ti/B_(4)C/dr40复合涂层的方法。研究和分析复合涂层中陶瓷颗粒的生成机制以及对晶粒的细化作用,柱状晶向等轴晶的转变过程,涂层表面裂纹产生的原因以及温度梯度和凝固速率对涂层显微组织的影响规律。为分析涂层的机械性能,对涂层进行硬度、压痕和划痕试验。结果表明,复合涂层与基体具有良好的冶金结合性能,凝固过程中生成的TiC和TiB_(2)硬质颗粒在磨损过程中起到骨架支撑作用,抑制基体的变形,降低材料去除率,提高了涂层的硬度和抗磨损性能。研究表明,通过激光熔覆技术制备的镍基复合涂层可以实现轴类零件的表面强化和再制造,具有良好的应用前景。
This paper presents a process for the fabrication of particle-reinforced Ti/B_(4)C/dr40 composite coatings on the surface of shaft parts by laser cladding technology.The mechanism of in situ ceramic particle and its refinement of the grains during the solidification process,the transformation from columnar to equiaxed crystals,the generation of cracks on the composite coating surface,and the effect of the temperature gradient and solidification rate on the microstructure were investigated and analyzed.In order to analyze the mechanical properties of the composite coating,indentation and scratch tests were carried out.The results show that the composite coating exhibits good metallurgical bonding with the substrate and the TiC and TiB_(2)hard particles generated during the solidification process play a skeletal role during wear process,inhibiting the plastic deformation of the matrix,reducing the material removal,and improving the microhardness and wear resistance of the composite coating.The research indicates that the fabricated Ni-based composite coatings by laser cladding technology can be used to achieve surface strengthening and remanufacturing of shaft parts.
作者
于津苏
何声馨
Yu Jinsu;He Shengxin(School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 45000l,Henan,China)
出处
《应用激光》
CSCD
北大核心
2023年第10期90-96,共7页
Applied Laser
基金
国家自然科学基金资助项目(51650110502)。
关键词
激光熔覆
轴类零件
镍基复合涂层
表面强化
laser cladding
shaft parts
Ni-based composite coating
surface strengthening
