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Graduate Institute ofFerrous Technology

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Research Highlight GRADUATE INSTITUTE OF FERROUS TECHNOLOGY

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Influence of austenite morphology on the hydrogen embrittlement in mediumMn transformation-induced plasticity (TRIP) steelwas investigated.With nearly the same volume fraction andmechanical stability, the lath-type austenite is found to have more beneficial effect in relieving the hydrogen susceptibility compared to the equiaxed one. Slower hydrogen uptake and diffusion are confirmed in the steel with the austenite of lath-type morphology, which is possibly led by more connections between austenite grains obstructing the migration of hydrogen.

List

[CML] Prof. Dong Woo Suh: Hydrogen Behavior in Ti-Added Reduced Activation Ferritic-Martensitic Steels

Hydrogen behavior and corresponding mechanical degradation were examined in TaTi-RAFM and EUROFER97 steels. Increased Ta content with Ti addition decelerates the hydrogen diffusion but increases the solub…

[CML] Prof. Dong Woo Suh Austenite Morphology and resistance to hydrogen embrittlement in medium Mn transformation-induced plasticity steel

[SSL] Prof. Sung-Joon Kim: Enhancement of tensile properties by room-temperature quenching and partitioning of 0.2C-10Mn-2Al steel

Processing conditions better than those of conventional quenching and partitioning process are suggested for 0.2C–10Mn–2Al steel. The steel can retain 24% of austenite on quenching to room temperature and effec…

[SSL] Prof. Sung-Joon Kim: Effect of grain size on hydrogen embrittlement in stable austenitic high-Mn TWIP and high-N stainless steels

Two stable austenitic steels, 20Cr-11Ni-5Mn-0.3N (wt%) stainless steel (STS) and 18Mn-1.5Al-0.6C (wt%) twinning-induced plasticity steel (TWIP), were investigated to understand the effect of grain size on hydro…

[ADL] Prof. Yoon-Uk Heo: Embrittlement mechanism in a low-carbon steel at intermediate temperature

Embrittlement behaviors were studied in a cast steel that bears a relatively large proportion of alloying elements (Mn, Cu, Nb, Ni) at intermediate temperatures. A low-carbon cast steel was heated to 167…

[MCL] Prof. Nack Joon Kim: Designing a magnesium alloy with high strength and high formability

Although magnesium alloys, as the lightest structural alloys, offer significant potential for automotive applications, their applications remain limited due to their poor formability at room temperature. Since …

[MCL] Prof. Nack Joon Kim: Effect of annealing conditions on the microstructure and tensile properties of 0.5 V containing Fe-16Mn-0.8C-0.5Si steel

Microstructure and tensile properties of Fe-16Mn-0.8C-0.5Si-0.5 V steel subjected to various annealing conditions have been investigated. Our results show that there is a precipitation of fine VC with a small a…

[CTL] Prof. Chang Hee Yim: Defect Formation Mechanism on the Surface of Cu-alloyed Steel During Heavy Plate Rolling

[CTL] Prof. Jung-Wook Cho: Thermal history driven molecular structure transitions in alumino-borosilicate glass

The glass network structure governs various thermos-physical properties such as viscosity, thermal, and electrical conductivities, and crystallization kinetics. We investigated the effect of temperature on str…

[CSL] Prof. Youn-Bae Kang: Influence of Al/Ti Ratio in Ti-ULC Steel and Refractory Components of Submerged Entry Nozzle on Formation of Clogging Depos…

Nozzle clogging during continuous casting of Ti-ULC (Ultra Low C) steel was investigated by inspections of plant-used SENs and laboratory scale experiments using a rotating finger method. Various Al/Ti ratios …

[EML] Prof. Sung-Mo Jung: Morphology of Iron and Agglomeration Behavior During Reduction of Iron Oxide Fines

The morphology of iron and agglomeration behaviour in the reduction progress of iron oxide fines were investigated in terms of isothermal reduction at 800 °C in an atmosphere of CO and H2. Agglomeration index w…

[PSL] Prof. Eul-Bum Lee: Risk Assessment and Mitigation Model for Overseas

This paper presents an analytic hierarchy process (AHP)-fuzzy inference system (FIS) model to aid decision-makers in the risk assessment and mitigation of overseas steel-plant projects. Through a thorough liter…

[PSL] Prof. Eul-Bum Lee: The Efficacy of the Tolling Model’s Ability to Improve

To overcome profitability deterioration in executing steel price projects, companies are seeking overseas expansion, which increases market size while reducing profit certainty. Special purpose companies (SPCs)…

[MRL] Prof. Chong Soo Lee: Effect of grain boundary engineering on hydrogen embrittlement in Fe-Mn-C TWIP steel at various strain rates

The influence of strain rate (10−3≤ε˙ ≤10−5 s−1) on hydrogen embrittlement behavior of Fe−17Mn−0.8C (wt.%) TWIP steel was investigated. Two types of specimens were tested; one (AR) was hot-rolled, and the other…

[MML] Prof. F. Barlat: Influence of Yield Stress Determination in Anisotropic Hardening Model on Springback Prediction in Dual-Phase Steel

In this study, a numerical sensitivity analysis of the springback prediction was performed using advanced strain hardening models. In particular, the springback in U-draw bending for dual-phase 780 steel sheets…