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为了改善BT20钛合金激光沉积修复质量,引进电磁搅拌装置辅助激光沉积修复,通过改变磁场强度和搅拌速率的方法研究旋转磁场对激光修复件宏观形貌,微观组织和显微硬度的影响。结果表明,在电磁场的辅助作用下,修复件表面平整;α/β片层组织被机械折断,晶内α片层长度减小,但α片层厚度几乎不变,为0.4~0.5μm,晶粒被细化,显微硬度提高;随着磁场强度和搅拌速度的增加,修复件的显微硬度增加,在一定磁场强度和搅拌速率下修复区显微硬度趋于均匀。
In order to improve the quality of BT20 titanium laser deposition and repair, the introduction of electromagnetic stirring device assisted laser deposition repair, by changing the magnetic field strength and stirring rate of the method of rotating magnetic field on the laser repair macroscopic morphology, microstructure and microhardness. The results show that the surface of the prosthesis is smooth with the help of electromagnetic field. The α / β sheet is mechanically broken, and the length of the α sheet in the sheet decreases. However, the thickness of α sheet is almost constant, 0.4 ~ 0.5μm The grains were refined and the microhardness increased. With the increase of the magnetic field strength and stirring speed, the microhardness of the repaired parts increased, and the microhardness of the repair area tended to be uniform under a certain magnetic field strength and stirring rate.