Pohang University of Science and Technology · Engineering
Professor Young-Kook Lee's research lab specializes in the development and characterization of advanced high-strength steels, with a focus on medium Mn steels, Fe-Mn alloys, and martensitic stainless steels. The lab investigates phase transformations, microstructure evolution, and mechanical properties—particularly transformation-induced plasticity (TRIP) and damping capacity—under varying processing conditions such as annealing and heating rates. Key research directions include the control of retained austenite, martensite reversion mechanisms, and the role of defects and phase boundaries in enhancing material performance. The lab combines experimental techniques like dilatometry, XRD, and TEM to understand structure-property relationships at the microscale.
Figures are computed from collected data and may differ slightly.
Medium Mn steels have been actively investigated due to their excellent balance between material cost and mechanical properties. The steels possess a single α′ martensite phase in hot and cold rolled states and multiphases after intercritical annealing. Many studies have focused on investigating the influences of chemical composition and annealing conditions on the microstructure, particularly the grain size and retained γ (γ R ), and on the tensile properties. The steels exhibit high strength a
The damping capacities of Fe-Mn binary alloys have been investigated in a wide range of manganese content from 5 to 30 wt%. The damping capacity increases with increasing manganese content, attains a maximum at approximately 17 wt% Mn, and decreases with further manganese content. It is suggested that the damping mechanisms of Fe-Mn alloys containing γ and ε phases are the stress-induced movement of the defects: stacking fault boundary in γ, stacking fault boundary in ε, ε martensite variant bou
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