Details

Autor(en) / Beteiligte

• Yan, Xingchen
• Chang, Cheng
• Dong, Dongdong
• Gao, Shuohong
• Ma, Wenyou
• Liu, Min
• Liao, Hanlin
• Yin, Shuo

Titel

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

Ist Teil von

• Materials science & engineering. A, Structural materials : properties, microstructure and processing, 2020-07, Vol.789, p.139615, Article 139615

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2020

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• 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 μm) 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. •A theoretical model is proposed to estimate the minimal energy density for SLM.•SLM copper fabricated under optimal laser energy density achieves a density of 99.10 ± 0.5%.•SLM copper made under optimal energy density achieves a surface roughness of 12.72 ± 4.54 μm.•SLM copper achieves comparable mechanical properties to its wrought counterpart.