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Carnegie Mellon University Builds Melt Pool Thermal Radiation Reflection Model, Reducing CFD Temperature Deviation from 15% to 4-6%
2026-06-03
A team at Carnegie Mellon University has developed a simulated thermography method to address the distortion of melt pool surface temperature measurements caused by thermal radiation reflection in L-PBF. The study shows that without considering reflection, the CFD deviation for 316L steel melt pool centerline temperature can be as high as 15%, which drops to 4-6% after reflection correction. Using longer imaging wavelengths can further reduce reflection effects. This method provides a more rigorous validation tool for controlling keyhole porosity and powder feedstock composition, and can be extended to applications requiring high-temperature surface temperature measurement, such as imaging of aviation high-temperature turbine blades and concentrated solar power.
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卡耐基梅隆大学建立熔池热辐射反射模型，CFD温度偏差从15%降至4-6%
卡耐基梅隆大学团队开发模拟热成像方法，解决L-PBF中熔池表面热辐射反射扭曲温度测量的问题。研究表明，不考虑反射时316L钢熔池中心线温度CFD与实验偏差高达15%；加入反射校正后降至4-6%。更长的成像波长可减少反射影响。该方法为控制匙孔气孔和粉末原料成分提供更严格的验证工具，同时可推广至航空高温涡轮叶片成像、聚光太阳能等需要高温表面测温的场景。