研究目的
Investigating the effects of hot isostatic pressing (HIP) on the mechanical properties of an Al-10%Si-0.4%Mg alloy fabricated by selective laser melting (SLM) and the effect of internal porosity on the mechanical properties of the alloy.
研究成果
HIP treatment effectively reduces internal porosity in Al-10%Si-0.4%Mg alloy fabricated by SLM, significantly improving elongation to failure. However, it also results in a decrease in proof stress and tensile strength due to microstructural changes. The study highlights the importance of optimizing laser irradiation conditions to minimize internal porosity and suggests that HIP treatment's effectiveness is limited by the presence of oxidized scales, which impede perfect diffusion bonding.
研究不足
The study found that HIP treatment significantly reduces internal porosity and improves elongation to failure but also leads to a decrease in proof stress and tensile strength due to microstructural changes at elevated temperatures. The presence of oxidized scales impedes perfect diffusion bonding during HIP, suggesting that optimizing laser irradiation conditions is crucial for aluminum alloy fabrication by SLM.
1：Experimental Design and Method Selection:
The study used selective laser melting (SLM) to fabricate Al-10%Si-
2：4%Mg alloy specimens under two different laser conditions to vary internal porosity. Hot isostatic pressing (HIP) was then applied to some specimens to study its effects on porosity and mechanical properties. Sample Selection and Data Sources:
Two types of specimens were prepared: one with optimal laser conditions for high relative density and another with low-energy density conditions to intentionally increase internal porosity.
3：List of Experimental Equipment and Materials:
The study used an EOSINT M280 SLM device from EOS GmbH, Germany, equipped with a Yb fiber laser. Mechanical properties were evaluated using a universal material testing machine (INSTRON 5583). Microstructure observation and elemental analysis were conducted using an electron probe microanalyzer (EPMA, JXA-8530F from JEOL Ltd.). Internal porosity was observed using an X-ray CT scanner (TOSCANER-32300μFD from Toshiba IT Control Systems Corporation).
4：3). Microstructure observation and elemental analysis were conducted using an electron probe microanalyzer (EPMA, JXA-8530F from JEOL Ltd.). Internal porosity was observed using an X-ray CT scanner (TOSCANER-32300μFD from Toshiba IT Control Systems Corporation). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Specimens were fabricated under argon atmosphere, with laser scanning patterns rotated by 67° per layer. HIP treatment was performed at 500°C under 100 MPa for 2 hours in an argon atmosphere. Tensile tests were conducted at a crosshead speed of 1 mm/min.
5：Data Analysis Methods:
The study analyzed the mechanical properties (0.2% proof stress, tensile strength, and elongation to failure) and microstructure changes before and after HIP treatment, using EPMA for elemental analysis and X-ray CT for porosity observation.
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