Forming Quality of High Layer Thickness of 316L Stainless Steel by Selective Laser Melting

Wang Peng; Shi Wentian; Liu Yude; Qi Bin; Yang Jin; Zhang Feifei; Ma Yingyi

doi:10.15980/j.tzzz.2019.05.011

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Forming Quality of High Layer Thickness of 316L Stainless Steel by Selective Laser Melting
Vol. 39, Issue 5, Pages: 501-505(2019)
Published： 2019 ，
DOI： 10.15980/j.tzzz.2019.05.011

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[1]王朋,石文天,刘玉德,祁斌,杨锦,张飞飞,马英怡.选区激光熔化316L不锈钢大层厚成形质量研究[J].特种铸造及有色合金,2019,39(05):501-505.

Wang Peng, Shi Wentian, Liu Yude, et al. Forming Quality of High Layer Thickness of 316L Stainless Steel by Selective Laser Melting. [J]. Special Casting & Nonferrous Alloys 39(5):501-505(2019)
[1]王朋,石文天,刘玉德,祁斌,杨锦,张飞飞,马英怡.选区激光熔化316L不锈钢大层厚成形质量研究[J].特种铸造及有色合金,2019,39(05):501-505. DOI： 10.15980/j.tzzz.2019.05.011.

Wang Peng, Shi Wentian, Liu Yude, et al. Forming Quality of High Layer Thickness of 316L Stainless Steel by Selective Laser Melting. [J]. Special Casting & Nonferrous Alloys 39(5):501-505(2019) DOI： 10.15980/j.tzzz.2019.05.011.

摘要

针对选区激光熔化成形150μm大层厚316L不锈钢进行工艺试验研究

通过对比不同的激光功率、能量密度、曝光时间、点距、线间距对316L不锈钢大层厚成形质量的影响

探索高致密度成形工艺。研究发现

高功率激光参数下成形大层厚试件效果更好

最佳激光能量密度范围是50～70J/mm

。通过对比小层厚与大层厚成形效果

发现大层厚在成形过程中会产生一些缺陷

通过调整工艺参数可减少缺陷产生。大层厚成形316L不锈钢微观组织主要由等轴晶和少量的柱状晶组成

拉伸力学性能达到锻件标准。

Abstract

The selective laser melting technology was used to form 150μm layer thickness 316 Lstainless steel to explore high-density forming processes by comparing different laser power

energy density

exposure time

point distance and hatch space.The results reveal that the formation quality of large layer thickness specimens at high power presents more desirable

and the optimized laser energy density range for large layer thickness formation is 50～70 J/mm

.By comparing the small layer thickness and the large layer thickness forming process

it is concluded that although the large layer thickness forming has some defects in the forming process

and most of the defects can be suppressed by adjusting the process parameters.The microstructure of large layer thickness 316 L stainless steel is mainly composed of equiaxed crystals and a small amount of columnar crystals.The mechanical properties of the specimens reach the standard values of specification for steel forgings.