Role of melt pool boundary condition in determining the mechanical properties of selective laser melting AlSi10Mg alloy

被引：245
作者：
Xiong, Z. H. [1 ]
Liu, S. L. [2 ]
Li, S. F. [1 ]
Shi, Y. [3 ]
Yang, Y. F. [1 ]
Misra, R. D. K. [4 ]
机构：
[1] Chinese Acad Sci, State Key Lab Multiphase Complex Syst, Inst Proc Engn, 1 Zhong Guan Cun North 2ndSt, Beijing 100190, Peoples R China
[2] Shanghai Tiao Tong Univ, Inst Adv Steels & Mat, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China
[3] Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, 287 Lan Gong Ping Rd, Lanzhou 730050, Gansu, Peoples R China
[4] Univ Texas El Paso, Lab Excellence Adv Steel Res, Mat Sci & Engn Program, Dept Met Mat & Biomed Engn, 500 W Univ Ave, El Paso, TX 79968 USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2019年 / 740卷
关键词：
Selective laser melting; AlSi10Mg alloy; Melt pool boundary; Cellular structure; Anisotropy; HEAT-TREATMENT; MICROSTRUCTURE; QUANTIFICATION; DISLOCATIONS; BEHAVIOR; PHASE;
D O I：
10.1016/j.msea.2018.10.083
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We describe here a comprehensive study on the effect of cellular structure and melt pool boundary (MPB) condition on the mechanical properties, deformation and failure behavior of AlSi10Mg alloy processed by selective laser melting (SLM). The morphology of melt pool (MP) on the load bearing face of tensile samples was significantly different with build directions. It resulted in different mechanical properties of the samples with different build directions. Furthermore, the microstructure analysis revealed that the MP in the SLM AlSi10Mg alloy mainly consisted of columnar alpha-Al grains which were made of ultra-fine elongated cellular structure. Electron back-scatter diffraction (EBSD) analysis revealed that the long axis of cellular structure and columnar grains were parallel to < 100 >, which resulted in < 100 > fiber texture in SLM AlSi10Mg alloy. However, Schmid factor calculation demonstrated that the anisotropy of mechanical properties of the SLM AlSi10Mg alloy built with different direction was mainly dependent on the distribution of MPB on the load bearing face, and not texture. The defects including pores, residual stress and heat affected zone (HAZ) located at MPB made it the weakest part in the SLM AlSi10Mg. The sample built along horizontal direction exhibited good combination of strength and plasticity and is attributed to the lowest fraction of MPBs that withstand load during tensile. MPB had strong influence on the mechanical properties and failure behavior of SLM AlSi10Mg built with different directions.
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页码：148 / 156
页数：9
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