Abstract

As industries are increasingly adopting the laser powder bed fusion (LPBF) additive manufacturing (AM) process, it is crucial to understand the process closely and to find ways to improve the final quality of the finished parts. The LPBF process is capable of producing tailored designs, which are lighter in weight and having strength comparable to conventional components. However, the acquired surface texture and some of the mechanical properties of LPBF-produced components are still sub-standard compared to the conventional components. As of now, the post-processing technique is witnessed as the only sustainable approach to enhance the mechanical and microstructural performance of the additive products since any further optimization of the LPBF processing parameters is reported inefficient in bringing the relevant changes in the as-built LPBF parts. So far, several post-processing techniques such as thermal, mechanical, and/or chemical-based have been applied to different additive materials, and the results have been beneficial. This article reviews the effects of post-processing operations on the surface integrity properties of as-built LPBF parts, namely surface roughness, microhardness, microstructure, mechanical strength, corrosion, and wear resistance. The results of the post-processing operations are also discussed and compared with the as-built and conventional conditions for different engineering materials.

摘要

随着行业越来越多地采用激光粉末床熔合（LPBF）增材制造（AM）工艺，至关重要的是，必须密切了解该工艺并找到提高最终零件最终质量的方法。LPBF工艺能够生产量身定制的设计，其重量更轻且强度可与传统组件媲美。但是，与传统组件相比，LPBF生产的组件的获得的表面纹理和某些机械性能仍不合格。截至目前 后处理技术被视为增强添加剂产品的机械和微观结构性能的唯一可持续方法，因为据报道，任何进一步优化LPBF处理参数的方法都无法有效地改善已制成LPBF零件的相关变化。到目前为止，几种基于热，机械和/或化学的后处理技术已应用于不同的添加剂材料，并且结果是有益的。本文回顾了后处理操作对制成的LPBF零件的表面完整性特性的影响，即表面粗糙度，显微硬度，显微组织，机械强度，腐蚀和耐磨性。