In the present work, the effect of process parameters such as laser power, scan speed and powder flow rate on the geometry and surface waviness of the bead during Laser Metal Deposition (LMD) was determined. A gas atomized powder of 316L stainless steel were employed, which were deposited on a stainless steel substrate at a rate of 2 kg/h. The experimental results indicated that the bead height, bead width and its wetting angle with respect to the substrate decreases with increasing scan speed and decreasing laser power. Here the scan speed and laser power exhibited contrasting effect on the shape and morphology of the bead. After analyzing the effects of process parameters, various deposition strategies were explored to fabricate a solid cylindrical sample followed by microstructural analysis and hardness measurements. The analysis of microstructures revealed the presence of solidification tracks, and columnar and homogeneous cellular dendritic grains, which are common features of additively manufactured alloys. Moreover, the optimized parameters of LMD were able to manufacture a 316L stainless steel with microhardness similar to that of as-cast and wrought samples of the same alloy.

在目前的工作中，确定了诸如激光功率，扫描速度和粉末流速之类的工艺参数对激光金属沉积（LMD）期间珠粒的几何形状和表面波纹度的影响。使用316L不锈钢的气体雾化粉末，其以2kg / h的速率沉积在不锈钢基底上。实验结果表明，磁珠高度，磁珠宽度及其相对于基板的润湿角随着扫描速度的增加和激光功率的减小而减小。在此，扫描速度和激光功率对珠子的形状和形态表现出相反的影响。在分析了工艺参数的影响之后，探索了各种沉积策略来制造固体圆柱状样品，然后进行微观结构分析和硬度测量。微观结构分析表明存在凝固轨迹，圆柱状和均质的蜂窝状树枝状晶粒，这是增材制造合金的常见特征。此外，LMD的优化参数能够制造出具有与相同合金的铸件和锻件相似的显微硬度的316L不锈钢。