摘要
在激光选区熔化(SLM)过程中,为了让零件拥有更好的成形质量,一般采用小层厚来进行打印,然而这会导致生产效率降低,不利于商业应用。为了解决激光选区熔化好的成形质量与高的生产效率相互矛盾的问题,通过优化工艺参数制备了不同铺粉厚度条件下的316L不锈钢试件。研究了不同铺粉厚度条件下工艺参数对致密度、粗糙度、力学性能和显微组织等的影响规律。对比三种铺粉厚度(30μm、45μm、60μm)的成形情况可以发现:在优化后的工艺窗口条件下,铺粉厚度对SLM试样致密度的影响较小,不同铺粉厚度下致密度均能达到99.90%以上,且显微组织均未见明显缺陷。铺粉厚度主要影响试样的尺寸精度、表面粗糙度和力学性能。随着铺粉厚度的增加,尺寸精度和粗糙度不断下降,抗拉强度逐渐提高,60μm铺粉厚度较30μm铺粉厚度成形效率提高了35.71%。
Small layer thickness is commonly used for printing in the selective laser melting(SLM)process to improve the forming quality of the parts.However,it has a negative impact on production efficiency and is not commercially viable.To solve the contradiction between good forming quality and high SLM production efficiency,316L stainless steel specimens with different powder layer thicknesses were prepared using optimizing process parameters.The technological parameter of the relative density,roughness,mechanical properties,and microstructure of the formed parts was studied under different powder layer thicknesses.When the forming conditions of three layer thicknesses(30μm,45μm,and 60μm)are compared,it is discovered that the layer thickness has little effect on the relative density of SLM samples under the optimized process window condition.Moreover,the relative density can reach more than 99.90%under different powder layer thicknesses,and there are no obvious defects in the microstructure.The dimensional accuracy,surface roughness,and mechanical properties of the samples are mainly affected by the layer thickness.The tensile strength gradually increases as the layer thickness increases,while the dimensional accuracy and roughness decrease.The forming efficiency of 60μm powder thickness is increased by 35.71%compared with 30μm powder thickness.
作者
李桥
刘佳
石岩
杜宪恒
Li Qiao;Liu Jia;Shi Yan;Du Xianheng(School of Electromechanical Engineering,Changchun University of Science and Technology,Changchun 130022,Jilin,China;National Base of International Science and Technology Cooperation for Optics,Changchun 130022,Jilin,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2022年第21期172-179,共8页
Laser & Optoelectronics Progress
基金
吉林省自然科学基金(20200201230JC)。
关键词
材料
316L不锈钢
选区激光熔化
成形效率
成形质量
层厚
materials
316L stainless steel
selective laser melting
forming efficiency
forming quality
layer thickness
