Abstract
We used selective laser melting (SLM) Inconel 718 (coded AS) to carry out three heat treatment processes: (1) double aging (coded A), (2) solid solution + A (coded SA), (3) homogenization + SA (coded HSA) in order to investigate the effects of microstructure changes and tensile strength enhancement on erosion resistance. The as-SLM IN718 and three heat-treated specimens were subjected to clarify the effects of erosion-induced phase transformation on tensile mechanical properties. All heat-treated specimens showed better erosion resistance than as-SLM IN718 did at all impact angles. The as-SLM IN718 and the three heat-treated specimens produced new γ′ phase or metal-oxide via particle erosion, which increased the surface hardness of the material. The thickness of the erosion affected zone is 200 μm, which is the main cause of tensile embrittlement.
Highlights
Inconel 718 (IN718) is widely applied in aeronautics, astronautics, and energy industries because of its excellent corrosion resistance, oxidation resistance, weldability, and mechanical properties under circumstances like room temperature and elevated temperature
IN718 is precipitation strengthened nickel-based superalloy which could be strengthened by precipitation of D022 γ” (Ni3Nb), L12 γ0 (Ni3(Al, Ti)), and D0a δ (Ni3Nb) in the γ matrix [5], could be imported in the engineering applications
selective laser melting (SLM) uses metal powder as raw material to be illuminated by a high-energy laser beam within a specified area
Summary
Inconel 718 (IN718) is widely applied in aeronautics, astronautics, and energy industries because of its excellent corrosion resistance, oxidation resistance, weldability, and mechanical properties under circumstances like room temperature and elevated temperature. Its application area includes gas turbines, turbine blades, rocket engines, components for oil and gas extraction, and nuclear engineering [1,2,3,4]. It has been applied to various industries [6]. Selective laser melting (SLM) is classified as the family of AM technologies. SLM uses metal powder as raw material to be illuminated by a high-energy laser beam within a specified area. It is rapidly solidified at high cooling rates [7,8,9]
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