Hanyang University · Engineering
Professor Jeongho Han's research lab specializes in advanced materials processing and surface engineering, with a focus on superplasticity in medium-Mn steels, nanostructured surface layers via high-energy shot peening, and diffusion bonding of dissimilar metals such as titanium and stainless steel. The lab investigates microstructure-property relationships, grain refinement mechanisms, and high-temperature joining techniques for structural materials, aiming to develop cost-effective, high-performance alloys for aerospace, nuclear, and automotive applications. Key research directions include enhancing ductility and strength through microstructural control and enabling reliable bonding of dissimilar materials using innovative surface treatments and processing methods.
Figures are computed from collected data and may differ slightly.
Superplastic alloys exhibit extremely high ductility (>300%) without cracks when tensile-strained at temperatures above half of their melting point. Superplasticity, which resembles the flow behavior of honey, is caused by grain boundary sliding in metals. Although several non-ferrous and ferrous superplastic alloys are reported, their practical applications are limited due to high material cost, low strength after forming, high deformation temperature, and complicated fabrication process. Here
Medium‐Mn steels have received significant attention from the steel industry as strong candidate materials for next‐generation advanced high‐strength steels. These steels can be manufactured by various routes, such as hot rolling plus annealing or cold rolling plus annealing, resulting in two different microstructural morphologies: laminate morphology or globular morphology with two‐phase microstructures. The resulting change in the microstructural morphology leads to a significant difference in
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