论文部分内容阅读
为了研究磁场搅拌对激光沉积钛合金组织和性能的影响,将自行设计的旋转磁场引入到激光成形系统中,并进行了钛合金沉积成形实验。考察了不同磁场参数下试样的宏观形貌和微观组织,测量了激光沉积层的显微硬度。结果显示:磁场引起激光熔池的强烈对流,使单道沉积层的表面呈现下凹状;且在一定范围内,磁场搅拌速率越快,沉积层α片层组织越细密,硬度越大,可达440HV0.1。表明旋转磁场加剧了熔池的对流,从而加快了其冷却速度,细化了沉积层内的片层组织,并提高沉积层的力学性能。
In order to study the effect of magnetic field stirring on the microstructure and properties of laser-deposited titanium alloy, a self-designed rotating magnetic field was introduced into the laser forming system and the deposition experiment of titanium alloy was carried out. The macroscopic and microstructures of the samples under different magnetic field parameters were investigated, and the microhardness of laser deposited layers was measured. The results show that the magnetic field causes intense convection in the laser pool, which makes the surface of single-layer sedimentary layer appear concave. And within a certain range, the speed of magnetic field agitation is faster. 440HV0.1. It shows that the rotating magnetic field aggravates the convection of the molten pool, accelerating the cooling rate, refining the lamellar structure in the deposited layer and improving the mechanical properties of the deposited layer.