Study on microstructure, mechanical properties and machinability of efficiently additive manufactured AISI 316L stainless steel by high-power direct laser deposition
Study on microstructure, mechanical properties and machinability of efficiently additive manufactured AISI 316L stainless steel by high-power direct laser deposition
复制标题
高功率直接激光沉积高效增材制造 AISI 316L 不锈钢的显微组织、力学性能和切削加工性研究
DOI：
10.1016/j.jmatprotec.2016.09.005
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发表时间：
2017-02-01
影响因子：
6.3
通讯作者：
Gao, Huabing
中科院分区：
文献类型：
--
作者：
Guo, Peng;Zou, Bin;Gao, Huabing
采用大功率激光直接沉积（HP DLD）技术快速制备大尺寸、高力学性能的AISI 316L不锈钢零件。为了高效地制造具有高表面质量和尺寸精度的不锈钢零件，应用了干铣削抛光。在DLD过程中，使用保温粉末来防止屈曲变形。研究了堆焊方向对不锈钢组织、力学性能和切削性能的影响。结果发现，在0度的构建方向上，显微组织是均匀的，而在90度的构建方向上，在显微组织中存在许多较大的枝晶晶粒。成型方向为0度的拉伸性能和硬度值高于成型方向为90度的拉伸性能和硬度值。对于两个构建方向，随着切削速度的增加，表面粗糙度减小，切削力和刀具磨损增加。增材制造的不锈钢在0度的构建方向上的切削力、刀具磨损和表面粗糙度相对较高，这意味着可利用可加工性的各向异性来提高效率并降低生产成本。(C)2016爱思唯尔B.V.保留所有权利。
High-power direct laser deposition (HP DLD) was utilized to fast generate AISI 316L stainless steel parts with large size and excellent mechanical properties. In order to efficiently manufacture the stainless steel parts with high surface quality and dimensional accuracy, a dry milling finish was applied. During the DLD process, heat retaining powder was employed to prevent buckling deformation. The effect of building direction on the microstructure, mechanical properties and machinability of the stainless steel was investigated. It was found that the microstructure was homogeneous, at the building direction of 0 degrees, while a number of larger dendritic grains were present in the microstructure, at the building direction of 90 degrees. The tensile properties and hardness values at the building direction of 0 degrees were higher than those at the building direction of 90 degrees. For both building directions, the decrement in surface roughness and the increment in cutting force and tool wear, were observed with the increase in cutting speed. The cutting force, tool wear and surface roughness of the additive manufactured stainless steel at the building direction of 0 degrees were relatively higher, which implies that the anisotropy in the machinability could be utilized to increase efficiency and reduce production cost. (C) 2016 Elsevier B.V. All rights reserved.