Behjat Amir, Shamanian Morteza, Sadeghi Fazlollah, Mosallanejad Mohammad Hossein, Saboori Abdollah
Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
Department of Management and Production Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy.
Materials (Basel). 2025 Jul 16;18(14):3343. doi: 10.3390/ma18143343.
The lack of new materials with desired processability and functional characteristics remains a challenge for metal additive manufacturing (AM). Therefore, in this work, a new promising AISI 316L-based alloy with better performance compared to the commercially available one is developed via the laser powder bed fusion (L-PBF) process. Moreover, establishing process-structure-properties linkages is a critical point that should be evaluated carefully before adding newly developed alloys into the AM market. Hence, the current study investigates the influences of various process parameters on the as-built quality and microstructure of the newly developed alloy. The results revealed that increasing laser energy density led to reduced porosity and surface roughness, likely due to enhanced melting and solidification. Microstructural analysis revealed a uniform distribution of copper within the austenite phase without forming any agglomeration or secondary phases. Electron backscatter diffraction analysis indicated a strong texture along the build direction with a gradual increase in Goss texture at higher energy densities. Grain boundary regions exhibited higher local misorientation and dislocation density. These findings suggest that changing the process parameters of the L-PBF process is a promising method for developing tailored microstructures and chemical compositions of commercially available AISI 316L stainless steel.
缺乏具有所需加工性能和功能特性的新材料仍然是金属增材制造（AM）面临的一项挑战。因此，在这项工作中，通过激光粉末床熔融（L-PBF）工艺开发了一种性能优于市售产品的新型AISI 316L基合金。此外，在将新开发的合金引入增材制造市场之前，建立工艺-结构-性能之间的联系是一个需要仔细评估的关键点。因此，当前的研究调查了各种工艺参数对新开发合金的成型质量和微观结构的影响。结果表明，提高激光能量密度会降低孔隙率和表面粗糙度，这可能是由于熔化和凝固过程得到了强化。微观结构分析显示，铜在奥氏体相内均匀分布，未形成任何团聚或第二相。电子背散射衍射分析表明，沿构建方向存在强烈的织构，在较高能量密度下，高斯织构逐渐增加。晶界区域表现出更高的局部取向差和位错密度。这些发现表明，改变L-PBF工艺的参数是开发具有定制微观结构和化学成分的市售AISI 316L不锈钢的一种有前景的方法。
