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Research Highlight GRADUATE INSTITUTE OF FERROUS TECHNOLOGY

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The orientation relationship between ferrite and (Fe,Mn)₃AlC has been investigated in an Fe-3.5Mn-5.8Al-1.05C based eutectoid alloy. Electron diffraction pattern analysis shows two possible orientation relationships between both phases. Accurate analysis using convergent beam electron diffraction reveals the deviation of ${[001]}_{f e r r i t e}$ pole from ${[110]}_{(F e, M n) 3 A l C}$ pole in Nishiyama-Wasserman orientation relationship and the coincidence of ${[111]}_{f e r r i t e}$ and ${[110]}_{(F e, M n) 3 A l C}$ poles in Kurdjumov-Sachs orientation relationship. Transmission Kikuchi diffraction resolves the orientation of several tens nanometer scales of ferrite+(Fe,Mn)₃AlC lamellar. Kurdjumov-Sachs orientation relationship between ferrite and (Fe,Mn)₃AlC is clarified by the comparison of deviation angle from both orientation relationships. Coherency at the interphase boundaries is further discussed. ${[001]}_{f e r r i t e}$

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[ADL]Prof. Yoon-Uk Heo: Accurate determination of orientation relationship between ferrite and (Fe, Mn)3AlC in an Fe-Mn-Al-C eutectoid alloy

The orientation relationship between ferrite and (Fe,Mn)3AlC has been investigated in an Fe-3.5Mn-5.8Al-1.05C based eutectoid alloy. Electron diffraction pattern analysis shows two possible orientation re…

[MRL] Prof. Chong Soo Lee: Improved cold-rollability of duplex lightweight steels utilizing deformation-induced ferritic transformation

The Fe–Mn–Al–C duplex lightweight steels have received considerable attention from the automotive industry because of their low density and good mechanical performance. However, their poor cold-rollability limi…

[MRL] Prof. Chong Soo Lee: Comparative study on the effects of Cr, V, and Mo carbides for hydrogen-embrittlement resistance of tempered martensitic st…

In this study, the ideal alloying element (among Cr, V, and Mo carbides) to enhance the resistance to hydrogen embrittlement (HE) in a tempered martensitic steel was investigated. Four types of steels were desi…

[MML] Prof. F. Barlat, Determining the coefficients of a homogeneous anisotropic hardening model for ultrathin steel sheets

In the present work, the constitutive description of a 0.1-mm-thick ferritic stainless steel sheet was optimized for application to springback simulations after bending. Springback simulations require Bausching…

[MML] Prof. F. Barlat, Failure characteristics of advanced high strength steels at macro and micro scales

The advanced high strength steels (AHSS) have gained major attention from research groups across the world especially in the last two decades. The exact description of the forming behavior of these steels has s…

[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

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-…

[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 …