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University of Pittsburgh Team Achieves Full-Part Thermal History Control in LPBF, Boosting Hardness to 439 HV
2026-05-02
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Impact score: 43
A research team from the University of Pittsburgh and other institutions published a paper in *Additive Manufacturing*, proposing laser powder bed fusion (LPBF) process optimization through full-part thermal history control. Using Alloy 718 as a case study, the team combined thermal simulation with trajectory optimization algorithms to dynamically adjust laser power and substrate temperature, achieving in-situ age hardening. The optimized inverted cone parts showed an average hardness improvement from 374 ± 41 HV to 439 ± 29 HV, with enhanced uniformity and no need for post-heat treatment, maintaining a repeatability error within 8%.
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匹兹堡大学团队实现LPBF全件热历史控制 硬度提升至439HV
美国匹兹堡大学等机构研究团队在《增材制造》发表论文，提出通过全零件热历史控制优化激光粉末床熔融工艺。研究以Alloy 718合金为例，结合热模拟与轨迹优化算法，动态调节激光功率和基板温度，实现原位时效硬化。优化后倒锥形零件平均硬度从374±41 HV提升至439±29 HV，均匀性改善，无需后续热处理，重复性误差在8%以内。