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Graduate Institute of Ferrous& Energy materials Technology

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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. ${[001]}_{f e r r i t e}$

List

[SSL] Prof. Sung-Joon Kim: Nitrogen effect on hydrogen diffusivity and hydrogen embrittlement behavior in austenitic stainless steels

Hydrogen embrittlement behavior of three austenitic stainless steels with 0.1–0.3 wt% N was investigated by electro-chemical charging of hydrogen. The degradation of tensile properties was allevia…

[CML] Prof. Dong Woo Suh:Quenching and partitioning (Q&P) processed medium Mn steel starting from heterogeneous microstructure

We examine the microstructure and tensile properties of the quenching and partitioning (Q&P) processed medium Mn steels having different starting microstructure. Heterogeneous Mn distribution l…

[CML] Prof. Dong Woo Suh:Analysis of transformation stasis by the Gibbs energy balance (GEB) approach modified to consider carbon redistribution int .…

The Gibbs energy balance (GEB) concept for modeling the transformation stasis during isothermal ferrite formationis revisited. Modification has been made to take into account the carbon redistribution into rema…

[CSL] Prof.Youn-Bae Kang:Dissolution kinetics of alumina in molten CaO–Al2O3–FetO– MgO–SiO2 oxide representing the RH slag in steelmaking process

In order to effectively remove alumina inclusions suspending in ultra-low C steel during RH process, the dissolution kinetics of alumina in molten CaO–Al2O3–FetO–MgO–SiO2 oxide was in…

[SNMPL] Prof. Hyoung Seop Kim:A new strategy for designing immiscible medium-entropy alloys with excellent tensile properties

Here, a new strategy for designing heterogeneous medium-entropy alloys with light-weight and excellent mechanical properties is proposed. Alx(CuFeMn)100-x (x = 0, 7.5, and 15 at%) …

[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…