镍基合金涂层对活塞热力学状态影响的仿真分析  

Simulation analysis of the influence of nickel-based alloy coating on thermodynamic state of piston

作　　者：高祥涵 虞佳杰 李仁兴[1] 丛孟启 崔方方[1] 楚佳杰 吴海东 韩冰源[1] GAO Xianghan;YU Jiajie;LI Renxing;CONG Mengqi;CUI Fangfang;CHU Jiajie;WU Haidong;HAN Bingyuan(School of Automotive and Traffic Engineering,Jiangsu University of Technology,Changzhou 213001,China)

机构地区：[1]江苏理工学院汽车与交通工程学院,江苏常州213001

出　　处：《江苏理工学院学报》2023年第2期34-45,共12页Journal of Jiangsu University of Technology

基　　金：江苏省自然科学基金项目“极端苛刻服役条件下发动机损伤关键件热障涂层强化机理研究”(BK20191036);基础科研计划项目“铝合金表面低温超音速火焰喷涂与激光重熔处理镍基覆层制备及表征”(JCKY61420051911);江苏理工学院研究生实践创新计划项目“铝合金活塞表面镍基喷涂粒子与等离子射流交互机理研究”(XSJCX21_16)。

摘　　要：为进一步拓展等离子喷涂技术在铝合金活塞表面防护领域的应用,延长活塞服役寿命,需要对涂层与活塞系统的热力学状态进行研究。以镍基合金涂层为例,通过对活塞模型进行适当的简化,建立了活塞系统热-力耦合场的三维有限元模型,详细分析了喷涂前后关键部位的温度变化情况,并对比了不同载荷以及不同涂层厚度对活塞变形的影响。结果表明:铝合金活塞顶面径向的温度分布和活塞头部至裙部纵向的温度分布呈较为明显的下降趋势;活塞的变形随温度梯度的增加而逐渐加大,涂层可有效改善活塞整体温度与梯度分布;活塞在四种典型位置的变形均随着角度的增加而减小,变形下降曲线几乎呈线性分布,当涂层厚度为0.3 mm时,活塞整体变形取最小值。研究结果为后续的优化设计铺垫了基础。In order to further expand the application of plasma spraying technology in the field of aluminum alloy piston surface protection and prolong the service life of piston,it is necessary to study the thermodynamic state of coating and piston system.In this paper,taking nickel-based alloy coating as an example,a three-dimensional finite element model of the thermal-mechanical coupling field of the piston system is established by properly simplifying the piston model.The temperature changes of key parts before and after spraying are analyzed in detail,and the influences of different loads and coating thicknesses on the piston deformation are compared.The results show that the radial temperature distribution on the top surface of the aluminum alloy piston and the longitudinal temperature distribution from the piston head to the skirt show a significant downward trend.The deformation of the piston gradually increases with the increase of the temperature gradient,and the coating can effectively improve the overall temperature and gradient distribution of the piston.The deformation of the four typical positions decreases with the increase of the angle,and the deformation curve is almost linear.Also,when the coating thickness is 0.3 mm,the overall deformation of the piston is minimum.It lays a foundation for the subsequent optimization design.

关 键 词：铝合金 等离子喷涂 热-力耦合 变形 

分 类 号：TG17[金属学及工艺—金属表面处理]