激光选区熔化S136合金不同轮廓尺寸的成形质量研究

Study on the selective laser melting forming quality of S136 alloy with different contour size

探索不同轮廓尺寸激光选区熔化S136合金的成形质量。在相同的工艺参数下,采用逐行扫描及倾斜分区策略制备了不同轮廓尺寸的试样。测定试样的孔隙率、致密度和硬度,以此优化不同轮廓尺寸的扫描策略。结果表明,在轮廓尺寸小于15 mm×15 mm时,逐行扫描可得到更优的成形质量,且易于路径规划;当轮廓尺寸大于15 mm×15 mm时,过长的扫描矢量会导致扫描道间预热效果下降,此时倾斜分区扫描会有更好的成形质量。在实际生产中,应当结合轮廓尺寸来选取合适的扫描策略,以获得更好的工艺质量。

This paper explored the forming quality of S136 alloy in different contour sizes by selective laser melting.With the same forming parameters,plane scanning and strip scanning strategy were used to form specimens with different contour size.Through the comparison of porosity,density and hardness of different specimens,the study explored the selection of scanning strategy under different contour size.The results show that when the contour size is less than 15 mm×15 mm,the plane scanning strategy will get better forming quality,and it will be easier to plan the scan path.But if the contour size is greater than 15 mm×15 mm,the preheating effect between long scan channels will decreases,so the strip scanning strategy will have better effect.In practice,the scanning strategy should be selected according to the contour size to obtain better process quality.