Tag: Yonguk Lee

Yonguk Lee published “Heteroepitaxial recrystallization under steep strain and temperature gradients” in Superalloy 718 and Derivatives. This paper addresses the HeRX behavior at varying processing conditions, discussing HeRX’s potential role for the abnormally large grain formation at strain limited condition, and competition between HeRX nucleation and annealing twin nucleation at primary γ’ particles at varying […]

Yonguk Lee published “Unraveling the impact of pressure and hold time in post-process heat treatments on microstructure and microhardness evolution in laser powder bed fusion Alloy 718” in Progress in Additive Manufacturing. This collaborative work with the Illinois Institute of Technology reports the accelerated recrystallization of LPBF Alloy 718 during the HIP process, suggesting that […]

Yonguk Lee recently published “On the Formation of Multiply Coherent γ Grains in a Powder Metallurgy Ni Base Superalloy” in the Superalloys 2024 proceedings. The paper reports a unique γ microstructure which contains multiple pinning particles inside that are coherent (multiply coherent gamma grains, MCGs), which are explained to have possibly formed through the combined effect of initial orientation […]

Yonguk Lee recently published “Prevalence of Heteroepitaxial Recrystallization in the Low Solvus High Refractory (LSHR) γ–γ′ Superalloy” in Metallography, Microstructure, and Analysis. The paper reports the observation of HeRX outside of low-misfit Ni-base superalloys for the first time, which suggests that HeRX can contribute to microstructural evolution in a much wider range of polycrystalline Ni-base […]

Yonguk (Tony) Lee passed his qualifying exam, with his proposal entitled “Heteroepitaxial recrystallization in Ni-based superalloys: its nucleation and boundary character.” Congrats Tony!