Porosity and surface defects characterization of hot isostatically pressed Inconel 718 alloy turbine blades printed by 3D laser metal fusion technology
Tóm tắt
Selective laser melting (SLM) additive manufacturing technique was applied to fabricate the turbine blade test parts using Inconel (IN) 718 powder. To reduce the porosity, the SLM-built turbine blade parts were subjected to the hot isostatic pressing (HIP) post-treatment. The focus of this study is to study the porosity, surface defects and texture of the SLM-printed and HIP-treated complexly shaped IN 718 alloy parts. The turbine blade test components were fabricated by the SLM process using a multidirectional stripe scanning strategy. The HIP post-treatment of the SLM-built turbine blade parts was conducted at the optimized regimes. The experimental results showed that the HIP process reduced the residual porosity value from 99.862 to 99.997% and value of the average pore size from about 6.5 to 1.25 μm. The side surfaces are rough due to the presence of various surface defects. Hot isostatically pressed Inconel 718 alloy turbine blades printed by laser powder bed fusion (L-PBF) technique. The porosity, surface defects, and surface texture/morphology of complexly shaped Ni-based specimens were studied after hot isostatic pressing process.
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