Abstract
The effect of Fe addition on the high-temperature mechanical properties of heat-resistant aluminum alloys produced by selective laser melting (SLM) was investigated in relation to the alloy microstructures. Fe is generally detrimental to the properties of cast aluminum alloys; however, we found that Fe-containing alloys produced by SLM had improved high-temperature strength and good ductility. Microstructural observations revealed that the increase in the high-temperature strength of the alloys was due to the dispersion of fine rod-shaped Fe-Si-Ni particles unique to the SLM material instead of the cell-like structure of eutectic Si.
Highlights
Selective laser melting (SLM) is an additive manufacturing method in which three-dimensional structures are formed by repeated melting and solidification of a metal powder by a laser [1]
The test piece was placed in an electric furnace, and after holding the furnace temperature at 300 ◦ C for about 1 h, the tensile test was started at a strain rate of 6.9 × 10−3 s−1
The ductility of the selective laser melting (SLM)-T6 Base alloy was improved compared with the cast Base alloys, though both alloys contained coarse Si particles
Summary
Selective laser melting (SLM) is an additive manufacturing method in which three-dimensional structures are formed by repeated melting and solidification of a metal powder by a laser [1]. SLM has been applied to cast Al alloys containing 10–12% Si [4,5,6,7,8,9] The microstructure of these alloys features a half-cylindrical melt pool [4,6] and a eutectic Si cellular structure [4,5,6,7] formed by quenching solidification due to the repeated laser scanning melting and solidification. Alrate alloys andFe-containing evaluated their high-temperature mechanical properties in relation to the low diffusion in Al, compounds can be used as a dispersion-strengthening phase alloy microstructure on the conditions assuming application in engine piston materials. Al alloys produced by pressure sintering of rapidly solidified powders containing large amounts of Fe show excellent high-temperature strength [20,21].
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