研究目的
Investigating the relevance of the volumetric energy density (VED) in the laser powder bed fusion (LPBF) process for Inconel 718, focusing on its impact on surface roughness, porosity, fractional density, and microhardness.
研究成果
The study concludes that VED is a significant parameter in the LPBF process for Inconel 718, affecting surface roughness, porosity, fractional density, and microhardness. A threshold VED of approximately 90 J·mm?3 was identified for optimal surface features and fractional density. The research validates the use of VED as a design parameter for LPBF, within the range where normality is matched for the responses.
研究不足
The study is limited by the specific conditions of the LPBF process for Inconel 718, including the constant layer thickness and the range of VED values tested. The findings may not be directly applicable to other materials or process conditions.
1：Experimental Design and Method Selection:
The study utilized a mixed experimental plan to investigate the outcome of LPBF under different VED conditions, with a constant layer thickness of 20 μm. The EOSINT M270 commercial laser sintering system was used for manufacturing cylinder specimens.
2：Sample Selection and Data Sources:
Cylinder specimens of 40 mm diameter and 20 mm height were manufactured using pre-alloyed, virgin, commercial argon gas atomized EOS NickelAlloy IN718 powder.
3：List of Experimental Equipment and Materials:
Equipment included the EOSINT M270 laser sintering system, a contact-type roughness tester, and a Vickers hardness tester. Materials included EOS NickelAlloy IN718 powder.
4：Experimental Procedures and Operational Workflow:
Specimens were manufactured under various VED conditions, followed by visual inspections, surface roughness measurements, porosity evaluation via image processing, and Vickers microhardness testing.
5：Data Analysis Methods:
Data were analyzed using normality tests (Anderson-Darling and Ryan-Joiner methods) and analysis of variance (ANOVA) to assess the significance of VED.
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