摘要
综述了稳态磁场、超声波振动及液氮强制冷却3种辅助技术在激光熔覆过程中的运用,以及对减少缺陷和改善熔覆层力学性能的影响。稳态磁场通过增强流体黏滞效应,减缓熔池流速,进而抑制气孔的形成。超声波振动则借助声流效应和空化效应,降低熔池温度梯度,细化晶粒,并有效抑制裂纹,从而提升熔覆层的力学和摩擦性能。液氮强制冷却通过加速冷却过程,提高温度梯度,减小残余应力,显著增强熔覆层的硬度和耐磨性。辅助激光熔覆的意义在于其能够解决传统激光熔覆过程中存在的一些难题,不仅可以推动激光熔覆技术的进步发展,还可以为材料科学应用领域提供高性能的材料。
Steady-state magnetic fields,ultrasonic vibration,and liquid nitrogen forced cooling are three auxiliary technologies widely applied in laser cladding.Auxiliary technologies can reduce defects in the cladding layer and enhance its mechanical properties.Steady-state magnetic fields cannot completely eliminate pores,suppressing pore formation by enhancing the fluid's viscosity effect.Ultrasonic vibration can reduce the temperature gradient in the melt pool and decrease the size of grains through the effects of acoustic streaming and cavitation.Ultrasonic vibration can enhance the mechanical and tribological properties of the cladding layer.Liquid nitrogen forced cooling accelerates the cooling process,thereby reducing residual stress,which leads to an increase in the hardness and wear resistance of the cladding layer.The significance of auxiliary technologies in addressing the challenges in traditional laser cladding processes.Auxiliary technologies not only advance laser cladding technology but also provide high-performance materials for the field of materials science.
作者
夏朋朋
章子乐
郑伊诺
袁哲渔
陈家乐
邱乐
张伊诺
赵向东
徐梓军
梁佳琪
耿燕飞
方铁辉
XIA Pengpeng;ZHANG Zile;ZHENG Yinuo;YUAN Zheyu;CHEN Jiale;QIU Le;ZHANG Yinuo;ZHAO Xiangdong;XU Zijun;LIANG Jiaqi;GENG Yanfei;FANG Tiehui(School of mechanical and electrical engineering,Wenzhou University,Wenzhou 325035,Zhejiang,China)
基金
国家自然科学基金项目(51701069)
中央高校专项支持计划(531118040070)
浙江省教育厅一般科研项目(Y202351914)。
关键词
激光熔覆
辅助技术
降低缺陷
laser cladding
auxiliary technology
defect reduction