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针对激光沉积修复316L不锈钢展开研究,重点研究了修复界面形状对修复区与基材结合处冶金质量的影响。将316L不锈钢基材预处理为底角为不同角度的倒等腰梯形坡口形貌,采用YAG脉冲激光器对切除区域进行多道多层激光沉积修复,观察修复区的沉积层生长特性及界面结合处的冶金质量。结果表明,当梯形坡口角度为105°时,启光侧靠近界面处熔覆层间开始产生熔合不良及未熔粉等缺陷;坡口角度约150°时,收光侧的沉积层生长出现波动,且波动性随着坡口角度的减小而显著增加;当坡口角度减小至90°时,启光侧修复界面处产生大量缺陷,收光侧无法形成沉积层生长。基于倾斜角度对激光能量密度的影响以及粉末与熔池的交互作用分析,揭示了坡口角度对缺陷形成及沉积层稳定性的影响机理。
The laser deposition repair 316L stainless steel research, focusing on the repaired interface shape of the repair area and the substrate at the metallurgical quality. The 316L stainless steel substrate was pretreated with an inverted isosceles trapezoidal groove with different angles. The YAG pulsed laser was used to repair the excised area by multi-layer laser deposition. The growth characteristics and interfacial adhesion of the repaired area were observed Department of metallurgical quality. The results show that when the trapezoidal groove angle is 105 °, defects such as poor fusion and unmelted powder begin to occur at the cladding layer close to the light-emitting side. When the groove angle is about 150 °, the deposition layer on the light-receiving side grows When the bevel angle is reduced to 90 °, a large number of defects occur at the repair interface of the light-emitting side, and the growth of the deposit layer can not be formed on the light-receiving side. Based on the influence of tilt angle on laser energy density and the interaction between powder and weld pool, the mechanism of the effect of groove angle on defect formation and deposition stability is revealed.