研究目的
Investigating the effects of stress-relieving heat treatment on the impact toughness of Direct Metal Laser Sintering (DMLS)-produced Ti6Al4V (ELI) parts.
研究成果
Stress-relieving heat treatment improves the impact toughness of DMLS Ti6Al4V (ELI) parts and shifts the ductile-to-brittle transition temperature to lower values. However, the toughness values obtained were still below the recommended levels for aerospace applications, indicating the need for further research to optimize the microstructure through additional heat treatments.
研究不足
The study did not investigate the effect of other heat treatment regimes beyond stress relieving on the impact toughness of DMLS Ti6Al4V (ELI) parts. Additionally, the use of miniature specimens could influence the toughness values compared to full-size specimens.
1：Experimental Design and Method Selection:
The study used the standard Charpy impact test to evaluate the impact toughness of as-built and stress-relieved Ti6Al4V (ELI) specimens over a temperature range of ?130°C to 250°C. Stress-relieving heat treatment was conducted at 650°C for 3 h in an argon gas atmosphere.
2：Sample Selection and Data Sources:
Atomized powder of Ti6Al4V (ELI) with average powder particle diameter of < 40 μm was used to build the Charpy impact test specimens through the DMLS additive manufacturing process.
3：List of Experimental Equipment and Materials:
An EOSINT M280 DMLS machine was used for specimen fabrication. Charpy impact testing was performed according to ASTM E23-2007 and ISO 148-1:2009 standards.
4：Experimental Procedures and Operational Workflow:
Specimens were conditioned at various temperatures using liquid nitrogen and absolute ethanol for cooling and a hot plate for heating. The Charpy impact test was conducted to measure the absorbed energy.
5：Data Analysis Methods:
The impact energy absorbed was recorded, and the mean and standard deviation were calculated to determine the scatter of the results. Fractographic analysis was performed on the fracture surfaces.
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