Presentation time: 10:00-11:00, November 12, 2022 (Saturday)
Report form: wechat video live: search "School of Mechanical Engineering, Yanshan University"
Speaker: Wu Jing
Author: Jing Wu, Associate Professor, Master supervisor, Yanshan University, School of Mechanical Engineering, Yanshan University. He graduated from Tianjin University. He is mainly engaged in the research of microstructure regulation and creep behavior of superalloys. He is a reviewer for journals such as JAC and AMS-EL. He taught one required course of "Basic Materials Science", and participated in two teaching and reform projects. Presided over 1 project of National Natural Science Foundation-Youth Science Fund and 1 project of Hebei Natural Science Foundation-Youth Science Fund. Currently, as the first author, he has published 9 SCI papers in Materials Science & Engineering A, Intermetallics and Acta Metallica Sinica, including 6 SCI+TOP journal papers and 2 ESI highly cited papers. Cover and 1 excellent paper of the year.
Ni3al-based superalloys have attracted a lot of attention due to their high temperature bearing capacity, excellent high temperature oxidation/corrosion resistance, low density and production cost, and broad application prospects. It is urgent to improve the thermal strength while ensuring the weldability for the further promotion and application of Ni3al-based superalloys. In this context, this report first briefly describes that in the composition design of Ni3al-based superalloys, the addition of Fe and Cr components can effectively improve the phase composition and welding performance of Ni3al-based superalloys. Aiming at the adjustment of alloy composition with excellent weldability, the multiphase transition characteristics of a high Fe and Cr element added Ni3Al based superalloy during solidization were further analyzed, and the evolution law of multiphase structure (γ '+γ two-phase, β phase between dendrites, γ' coating, etc.) under different high temperature cooling, high temperature annealing and long-term aging processes was summarized. The influence of complex structural variables (primary γ 'phase size, β phase morphology, β internal phase evolution, γ' coating broadening) on the creep behavior is also discussed. Finally, the latest research progress of creep behavior of multiphase Ni3Al-based superalloys is summarized, and the further development of multiphase Ni3Al-based superalloys is prospected.
School of Mechanical Engineering, Yanshan University
10 November 2022
