研究目的
Investigating the connection between macroscopic stress and diffraction-based microstrain in laser powder bed fused Ti-6Al-4V, and comparing experimental results with commonly used models to determine diffraction elastic constants.
研究成果
The study concludes that LPBF materials possess different DECs than wrought alloys due to their microstructural and mechanical properties. Existing models can be used to calculate DECs if high accuracy is not required, but a new approach is needed for materials with peculiar microstructures. The tension-compression asymmetry observed may be attributed to the presence of lack of fusion/crack-like defects.
研究不足
The study focuses on LPBF Ti-6Al-4V and may not be directly applicable to other materials or manufacturing processes. The precision of RS calculations could be affected by the assumptions made in the models used.
1：Experimental Design and Method Selection:
In-situ synchrotron X-ray diffraction (SXRD) was used to determine the link between macroscopic stress and diffraction-based microstrain in LPBF Ti-6Al-4V.
2：4V. Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Ti-6Al-4V rods and cuboids were printed using an SLM Solutions 280HL machine. Two samples were investigated in as-built conditions and two after heat treatment.
3：List of Experimental Equipment and Materials:
An SLM Solutions 280HL machine, plasma-atomized Ti-6Al-4V ELI grade 23 powder, EDDI beamline (BESSY II, HZB, Berlin) for SXRD, and a load rig for mechanical tests.
4：Experimental Procedures and Operational Workflow:
In-situ SXRD tension and compression tests were performed in transmission mode. Lattice strain was calculated from dhkl values at every load step.
5：Data Analysis Methods:
Diffraction peaks were fitted using a Pseudo-Voigt function; an in-house developed Mathematica code was employed.
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