钛合金表面激光熔覆Ni60A合金涂层熔凝行为的数值模拟与试验验证
Numerical simulation and experimental verification on melting behavior of Ni60A alloy coating on titanium alloy by laser cladding
龚玉玲 1龚非 2陈林 3徐晓栋 1钟奕慧 1黄云超1
作者信息
- 1. 泰州学院机电工程学院,江苏泰州 225300
- 2. 南京航天工业科技有限公司,江苏南京 210000
- 3. 江苏恒力制动器制造有限公司,江苏靖江 214500
- 折叠
摘要
为了准确预测同轴送粉激光熔覆过程中熔覆层的几何形貌和动态熔凝行为,利用COMSOL Multiphysics©软件建立了 Ti6Al4V合金表面激光熔覆Ni60A合金涂层过程中多相耦合数值模型,并通过单道激光熔覆试验进行了验证.结果表明,模拟结果与试验实际测量的熔覆层截面宽度、高度、深度及稀释率的偏差率分别为-2.63％、12.19％、4.55％和-1.94％,初步验证了模型预测几何形貌的可靠性.另外,为了探究Ni60A合金涂层的熔凝行为,通过模拟进一步获取了熔池内的温度梯度G和凝固速率R的分布图,并结合熔覆层SEM观察表征,建立了晶粒特性与凝固参数之间的关系,发现晶粒类型(平面晶、柱状晶和等轴晶)主要受温度梯度和凝固界面过冷度的影响,而晶粒尺寸主要受凝固速率控制.
Abstract
In order to accurately predict the geometric morphology and dynamic melting behavior of the clad layer during coaxial powder feeding laser cladding,a multi physical field coupled numerical model for the laser cladding of Ni60A alloy coating on Ti6Al4V alloy surface was proposed by using COMSOL Multiphysics© software and verified by single laser cladding test.The results indicate that the deviation rates between simulation results and experimental measurements in the cross-sectional width,height,depth and dilution ratio of the clad layer are-2.63％,12.19％,4.55％and-1.94％,respectively,which preliminarily verifies the reliability of its prediction of geometric morphologies.Besides,in order to investigate the melting behavior of the Ni60A alloy coating,the distribution maps of temperature gradient G and solidification rate R in the molten pool were further obtained by the simulation,and combined with SEM observation and characterization,the relationship between grain characteristics and solidification parameters was established.It is found that the types of grains(planar,columnar and equiaxed)are mainly influenced by temperature gradients and undercooling at the solidification interface,while the grain sizes are mainly controlled by the solidification rate.
关键词
激光熔覆/Ni60A合金涂层/几何形貌/凝固参数/晶粒Key words
laser cladding/Ni60A alloy coating/geometric morphology/solidification parameter/grain引用本文复制引用
基金项目
江苏省教育科学规划课题(十三五)(C-a/2018/01/04)
泰州市科技局社会发展项目(TS202234)
泰州学院"课程思政"示范建设项目(2022)(22KCSZ10)
泰州学院高层次人才科研启动基金(TZXY2023QDJJ)
出版年
2024
NETL
NSTL
万方数据