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Laser scanning strategy-dependent thermomechanical evolution in LPBF processed Ti-6Al-4 V.

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Název: Laser scanning strategy-dependent thermomechanical evolution in LPBF processed Ti-6Al-4 V.
Autoři: Lu, Peipei1,2 (AUTHOR) pplu6817@126.com, Ye, Xiu3 (AUTHOR), Cai, Yiming1 (AUTHOR), Ding, Fei1 (AUTHOR)
Zdroj: Materials & Manufacturing Processes. 2025, Vol. 40 Issue 15, p2081-2092. 12p.
Témata: RESIDUAL stresses, THERMAL analysis, MECHANICAL loads, FABRICATION (Manufacturing), SURFACE properties, TITANIUM alloys, SELECTIVE laser melting
Abstrakt: This work innovatively investigates the effects of scanning strategies on the thermo-mechanical behavior and surface characteristics of Ti-6Al-4 V components fabricated by Laser Powder Bed Fusion (LPBF). Through integrated computational modeling and experimental validation, five scanning strategies (unidirectional linear, bidirectional alternating, contour-offset, chessboard partitioning, and cross-hatch) are evaluated to quantify their influence on thermal profiles, stress evolution, and surface integrity. Numerical simulations reveal that chessboard partitioning significantly reduces residual stresses by 44.4% compared to cross-hatch strategies, while experimental measurements confirm a corresponding 15.4% improvement in surface roughness. The thermal analysis demonstrates extreme cooling rates up to 6.0 × 107 °C/s and characteristic "teardrop" melt pool morphologies with peak temperatures exceeding 2100°C. The stress distribution patterns demonstrate a consistent orientation parallel to the scanning paths, with peak tensile stress concentrations predominantly located at the component peripheries. The findings establish quantitative process-structure-property relationships, highlighting chessboard partitioning as an optimal strategy for simultaneously reducing stress and enhancing surface quality. [ABSTRACT FROM AUTHOR]
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Abstrakt:This work innovatively investigates the effects of scanning strategies on the thermo-mechanical behavior and surface characteristics of Ti-6Al-4 V components fabricated by Laser Powder Bed Fusion (LPBF). Through integrated computational modeling and experimental validation, five scanning strategies (unidirectional linear, bidirectional alternating, contour-offset, chessboard partitioning, and cross-hatch) are evaluated to quantify their influence on thermal profiles, stress evolution, and surface integrity. Numerical simulations reveal that chessboard partitioning significantly reduces residual stresses by 44.4% compared to cross-hatch strategies, while experimental measurements confirm a corresponding 15.4% improvement in surface roughness. The thermal analysis demonstrates extreme cooling rates up to 6.0 × 107 °C/s and characteristic "teardrop" melt pool morphologies with peak temperatures exceeding 2100°C. The stress distribution patterns demonstrate a consistent orientation parallel to the scanning paths, with peak tensile stress concentrations predominantly located at the component peripheries. The findings establish quantitative process-structure-property relationships, highlighting chessboard partitioning as an optimal strategy for simultaneously reducing stress and enhancing surface quality. [ABSTRACT FROM AUTHOR]
ISSN:10426914
DOI:10.1080/10426914.2025.2566493