研究目的
Exploring the Correlation between Subsurface Residual Stresses and Manufacturing Parameters in Laser Powder Bed Fused Ti-6Al-4V
研究成果
The study concludes that an increase in volumetric energy density decreases residual stresses, though not uniformly across all parameter variations. It also highlights the impact of sample orientation with respect to Ar flow on residual stresses, recommending monitoring such parameters to improve part reliability and reproducibility.
研究不足
The study acknowledges the complexity of tracking all factors influencing residual stresses in additive manufacturing parts, suggesting that not all can be fully measured in a comprehensive design of experiment.
1：Experimental Design and Method Selection:
The study used X-ray synchrotron diffraction to investigate subsurface residual stresses in Ti-6Al-4V cuboid samples manufactured by laser powder bed fusion (LPBF) with different processing parameters.
2：Sample Selection and Data Sources:
18 cuboids with a size of 5 × 5 × 15 mm3 were produced using plasma atomized Ti-6Al-4V ELI grade 23 powder.
3：List of Experimental Equipment and Materials:
A SLM Solutions 280HL machine was used for manufacturing, and the RS analysis was performed at the synchrotron source BESSY II at the EDDI beamline.
4：Experimental Procedures and Operational Workflow:
The samples were systematically measured on the surface opposite to a defined line, with seven points along the sample height mapped to obtain the stress component along the building direction.
5：Data Analysis Methods:
The sin2ψ method was used for RS analysis, assuming the normal stress component negligible at the surface.
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