Microstructure,cracking behavior and control of Al-Fe-V-Si alloy produced by selective laser melting  

作　　者：Shao-Bo Sun Li-Jing Zheng Jin-Hui Liu Hu Zhang 

机构地区：[1]School of Materials Science and Engineering,Beihang University,Beijing,100191,China [2]Modern Manufacturing Engineering Center,Heilongjiang Institute of Science and Technology,Harbin,150027,China

出　　处：《Rare Metals》2023年第4期1353-1362,共10页稀有金属（英文版）

基　　金：financially supported by the National High-Tech Program of China(No.21100002013101006)。

摘　　要：Selective laser melting(SLM)technology based on atomized powder was used to fabricate Al-8.5Fe-1.3V-1.7Si(wt%)alloy parts.The microstructure and crack characterization of SLM samples fabricated at various conditions were presented.Results show that the cracks appear periodically along the building direction,initiate preferably at the outer edges of the as-built samples and propagated along the remelting border zone(RBZ)into deposited layers.Solid-phase cracking is proposed according to the fracture morphology.The thermal-induced residual stress during SLM combined with the precipitation of relatively large-sized Al_mFe phase in the RBZ results in the formation of cracks.Enhancing scanning speed and hatch distance enable to reduce the cracking sensitivity.The crack-free Al-8.5Fe-1.3V-1.7Si parts can be fabricated at optimized parameters of laser power of 320 W,scanning speed of 1000 mm·s^(-1)and hatch distance of0.10 mm along with proper laser pre-heating procedure.The samples built horizontally show good ultimate tensile properties of 454 MPa in average with the elongation of7.2%.

关 键 词：Al-Fe-V-Si alloy Selective laser melting MICROSTRUCTURE Cracking behavior Mechanical properties 

分 类 号：V252[一般工业技术—材料科学与工程] TG146.21[航空宇航科学与技术—航空宇航制造工程]