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Effects of direct aging treatment on microstructure,mechanical properties and residual stress of selective laser melted AlSi10Mg alloy

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Journal of Materials Science & Technology 2023年第8期139卷 198-209页

作者： Huaping Tang Chaofeng Gao Yong Zhang Nannan Zhang Chuan Lei Yunjie Bi Ping Tang Jeremy Heng Rao Institute of Advanced Additive Manufacturing Ji Hua LaboratoryFoshan 528200China Department of Materials Science and Engineering Monash UniversityClaytonVIC 3800Australia National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China Hunan Farsoon High-Tech Co. LtdChangsha 410000China

Direct aging treatment is an important post-processing procedure,yet little research has been done on how it balances the mechanical properties and the stress removal for selective laser melted(SLMed)AlSi10Mg ***,we proposed a typical direct aging treatment on SLMed AlSi10Mg alloys,and studied the effects on their microstructure,properties and residual stress *** results indi-cate that the as-built microstructure is mainly composed of fine cellularα-Al and reticulated Si phases,and some pre-existing precipitates and dislocations are found in these *** direct aging treatment promotes the precipitation of nano-scaled Si phases and preserves a network-like Si ***,the strength of the peak-aged alloy increases while the ductility *** the aging temperature in-creases from 160 to 200℃,aging hardening behavior was accelerated *** at 160℃ for 4-9 h removes 32.0%-43.0%of the residual stress,which is attributed to the decomposition of the su-persaturatedα-Al matrix,the precipitation of the nano-Si phase and the exposure of low-angle grain boundaries(LAGBs).Considering the overal alloy performance obtained,over-aging at 160℃ for 4 h is the optimized heat treatment *** this condition,the yield strength(YS),ultimate tensile strength(UTS)and elongation(EL)of the alloy in the transverse and longitudinal direction are 309.5 MPa,464.4 MPa and 8.3%and 286.4 MPa,464.9 MPa and 5.1%,respectively.

关键词： Selective laser melting AlSi10Mg alloys Direct aging treatment residual stress removal

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