Microstructure and mechanical properties of pure copper manufactured by selective laser melting

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:789

Article

Yan, Xingchen^1,2  Chang, Cheng³  Dong, Dongdong¹  Gao, Shuohong²  Ma, Wenyou¹  Liu, Min¹  Liao, Hanlin²  Yin, Shuo⁴ 

[1] Guangdong Inst New Mat, Natl Engn Lab Modern Mat Surface Engn Technol, Key Lab Guangdong Modern Surface Engn Technol, Guangzhou 510651, Peoples R China

[2] Univ Bourgogne Franche Comte, ICB, UTBM, CNRS,UMR 6303, F-90010 Belfort, France

[3] Univ Technol Troyes, UMR CNRS 6281, ICD LASMIS, 12 Rue Marie Curie,CS 42060, F-10004 Troyes, France

[4] Univ Dublin, Trinity Coll Dublin, Dept Mech & Mfg Engn, Parsons Bldg, Dublin 2, Ireland

关键词: Selective laser melting;    Microstructure evolution;    Mechanical property;    Fracture mechanism;    Roughness;   

DOI  :  10.1016/j.msea.2020.139615

来源: Elsevier

【 摘 要 】

Selective laser melting (SLM) was used to fabricate copper samples under various processing parameters. The influence of laser linear energy density on the microstructures and mechanical properties of the SLM copper samples were investigated theoretically and experimentally. Based on the results, the optimal linear energy density that can result in the best relative density (99.10 +/- 0.5%) and surface roughness (Ra = 12.72 +/- 4.54 mu m) was determined to be 0.50 J/mm which corresponds to the laser power and scanning speed of 200 W and 400 mm/s, 300 W and 600 mm/s, respectively. Under the optimal processing conditions, the microhardness and strength (i.e., yield strength and ultimate tensile strength) of the copper sample achieved the highest value. In addition, it is also found that the microstructure of the SLM pure copper samples was characterized by polycrystalline grains with columnar dendrites and equiaxed structures dispersed inside. The grain size showed a decreasing trend as linear energy density increased due to the improved intrinsic heat treatment effect. The paper proves that nearly full dense copper with desirable mechanical properties can be fabricated through SLM.

【 授权许可】

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