电子束选区熔化增材制造TiAl合金及其热处理工艺研究进展OA

Electron Beam Melting(EBM)is an ideal forming method for additive manufacturing(AM)of brittle TiAl alloy components,enabling the formation of complex structures and the achievement of superior performance in TiAl alloys.Compared to other additive manufacturing techniques,EBM of-fers advantages such as high preheating temperatures,resistance to cracking,and low oxygen content,making it widely researched,especially for the Ti-48Al-2Cr-2Nb(4822)alloy.The average grain size of 4822 alloy prepared by EBM is typically less than 20 pm,significantly smaller than that of traditionally cast alloys.The room-temperature strength of 4822 alloy prepared by EBM can reach over 600 MPa,but it exhibits poor ductility and defects.Hot isostatic pressing(HIP)and high-temperature heat treatme-nt(HT)are important post-processing methods to enhance mechanical properties,increasing the room-temperature elongation to 1.3％.However,there are still many issues with the EBM process and HT of TiAl alloys.This paper reviews the recent research progress in EBM additive manufacturing of TiAl al-loys and their HT processes,analyzes and summarizes the current problems and countermeasures,and provides an outlook on the future development direction of additive manufacturing of TiAl alloys.