Abstract
The selective laser melting of tin bronze (CuSn10) powder was performed with a laser energy density intensity level at 210, 220, and 230 J/mm2. The composition was homogeneous with almost all tin dissolved into the matrix. The grain size of the obtained alpha copper phase was around 5 μm. The best properties were achieved at 220 J/mm2 laser energy density with a density of 8.82 g/cm3, hardness of 78.2 HRB (Rockwell Hardness measured on the B scale), yield strength of 399 MPa, tensile strength of 490 MPa, and an elongation that reached 19%. “Balling effect” appeared and resulted into a decrease of properties when the laser energy density increased to 230 J/mm2.
Highlights
Tin bronze (CuSn10 ) is widely used as bearing materials for its good mechanical properties [1].Nowadays, mechanical alloying (MA) [2], powders metallurgy (PM) [3], and traditional casting [4]are the common methods for sintering CuSn10 products
Materials 2018, 11, 614 of 3D-printed AlSi10 Mg alloys, and the results showed that laser energy density has a significant effect on the forming of defects which could lead to poor mechanical properties of the as-printed parts
The mechanical properties of samples fabricated under 210 J/mm2, 220 J/mm2, and 230 J/mm2 laser energy densities were characterized by room temperature tensile tests, considering that the properties are poor when the laser energy density is less than 210 J/mm2
Summary
Tin bronze (CuSn10 ) is widely used as bearing materials for its good mechanical properties [1]. The porosity and strength are the most important problems in the selection of these sintering processes Many effective methods, such as using high quality sintered powder, reducing the oxygen content, and adding reinforcing phases, have been carried out to improve its mechanical properties [5,6]. Materials 2018, 11, 614 of 3D-printed AlSi10 Mg alloys, and the results showed that laser energy density has a significant effect on the forming of defects which could lead to poor mechanical properties of the as-printed parts. Zhang et al [14] indicated that a laser energy density over 340 J/mm can result in dense 3D-printed parts of wrought Al-Cu-Mg alloys. Additive manufacturing of pure tin bronze (CuSn10 ) powder was performed at a low laser power, and the relationship between the metal properties and laser energy density was revealed
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