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Junhee Hahn 7 Articles
234 Oxidation of Ni-Cr-Co-Al-Mo-Ti-Re-Ta-W-Ru Single Crystals at 1000 oC in Air
Ni-Cr-Co-Al-Mo-Ti-Re-Ta-W-Ru 단결정의 대기중 1000 oC에서의 산화
Junhee Hahn, Xiao Xiao, Dong Bok Lee
한준희, Xiao Xiao, 이동복
Korean J. Met. Mater. 2020;58(4):234-246.   Published online 2020 Mar 11
DOI: https://doi.org/10.3365/KJMM.2020.58.4.234

Three kinds of Ni-based single crystals with the compositions of 63.8Ni-7.5Cr-5.1Co-4.8Al-1.9Mo- 0.9Ti-3Re-11.8Ta-1.2W, 61.4Ni-7.4Cr-5Co-4.8Al-1.8Mo-0.9Ti-3.1Re-11.6Ta-4W, and 60.9Ni-7.5Cr-5Co-4.8Al- 2Mo-1Ti-2.9Re-10.9Ta-1.2W-3.8Ru, in wt%, were cast in a Bridgman furnace. In the cast alloys, Cr, Co, Re, Mo, W, and Ru became microsegregated in dendrites consisting of γ-Ni, while Ni, Ta, and Al microsegregated in interdendrites..... More

182 Long-time Oxidation of Ti3(Al,Si)C2 Carbides at 400-800 oC
Junhee Hahn, Sang Whan Park, Dong Bok Lee
Korean J. Met. Mater. 2020;58(3):182-189.   Published online 2020 Mar 5
DOI: https://doi.org/10.3365/KJMM.2020.58.3.182

Quarternay carbides of Ti3AlxSi1-xC2 (x=0.3, 0.5, and 0.7) were oxidized at 400, 600, and 800 °C for 0.5-6 months in order to study their long-time oxidation behavior in air. When they were oxidized at 400-600 oC for 0.5-3 months, oxidation proceeded relatively slowly with moderate weight gains. However, further oxidation..... More

648 High-Temperature Corrosion of Ti-44Al-6Nb-2Cr-0.3Si-0.1C Alloy in 0.2%SO2/Ar Gas
Ti-44Al-6Nb-2Cr-0.3Si-0.1C 합금의 0.2%SO2/Ar가스에서의 고온부식
Shi Yuke, Xiao Xiao, Seong Woong Kim, Jae Keun Hong, Junhee Hahn, Dong Bok Lee
Shi Yuke, Xiao Xiao, 김성웅, 홍재근, 한준희, 이동복
Korean J. Met. Mater. 2019;57(10):648-655.   Published online 2019 Sep 23
DOI: https://doi.org/10.3365/KJMM.2019.57.10.648

Cast Ti–44Al–6Nb–2Cr–0.3Si–0.1C alloy having good air-oxidation resistance was corroded under 1 atm of flowing 0.2%SO2/Ar gas at 900-1100 oC for 50-300 h in order to examine its corrosion behavior in a SO2-containing environment, because SO2 is an industrially important by-product in the field of combustion and processing of fossil fuels...... More

                           Cited By 1
575 High-Temperature Oxidation of Fe-12Cr-0.3C-4Mn-(13-15)Cu Composite Alloys
Min Jung Kim, Sang-Hwan Bak, Junhee Hahn, Seon Jin Kim, Dong Bok Lee
Korean J. Met. Mater. 2019;57(9):575-581.   Published online 2019 Aug 21
DOI: https://doi.org/10.3365/KJMM.2019.57.9.575

Alloys of Fe-12Cr-0.3C-4Mn-(13, 14, 15)Cu (wt%) were cast using an induction furnace. They were structurally heterogeneous composites that consisted of a relatively stiff α-Fe matrix and a soft (Cu, Mn)-rich secondary phase. They were developed as self-lubricating, wear-resistant metals. Since the formation of oxides plays an important role in wear,..... More

                           Cited By 1
236 Corrosion of Hot-dip Aluminized 9Cr-1Mo Steel in N2/0.1%H2S Gas
Muhammad Ali Abro, Junhee Hahn, Dong Bok Lee
Korean J. Met. Mater. 2019;57(4):236-244.   Published online 2019 Apr 5
DOI: https://doi.org/10.3365/KJMM.2019.57.4.236

ASTM P91 steel (viz. 9Cr-1Mo steel) was hot-dip aluminized to form a ~70 μm thick coating, and was then corroded in N2/0.1%H2S gas for 50 h at 800 and 900 ºC, to study the effect of aluminizing on the corrosion resistance of P91 steel in highly corrosive H2S environments. Before..... More

350 High-temperature Oxidation of Hot-dip Aluminized 2.25Cr-1Mo Steel
Muhammad Ali Abro, Junhee Hahn, Dong Bok Lee
Korean J. Met. Mater. 2018;56(5):350-359.   Published online 2018 May 8
DOI: https://doi.org/10.3365/KJMM.2018.56.5.350

When 2.25Cr-1Mo steel was hot-dip aluminized, a coating consisting of (Al-rich topcoat)/(Al13Fe4 layer)/(Al5Fe2 layer) formed. With increment of oxidation temperature, the transform of Al→Al13Fe4→Al5Fe2→AlFe→AlFe3→α-Fe(Al)→α-Fe occurred through interdiffusion between the coating and the substrate as follows. The oxidation at 700 oC changed the coating to (α-Al2O3 scale)/(α-Al2O3, Al13Fe4, Al5Fe2)-mixed layer)/(Al5Fe2 layer)/(AlFe..... More

         Cited By 2
272 High-temperature Corrosion of CrAlSiN Thin Films in N2/0.1%H2S Gas
Muhammad Ali Abro, Junhee Hahn, Dong Bok Lee
Korean J. Met. Mater. 2018;56(4):272-279.   Published online 2018 Apr 5
DOI: https://doi.org/10.3365/KJMM.2018.56.4.272

Cr25.2Al19.5Si4.7N50.5 thin films were deposited on steel substrates by cathodic arc plasma deposition. They consisted of alternating fcc-Cr(Al)N/hcp-Al(Cr,Si)N nanolayers. They were corroded at 900 and 1000 oC for 5-100 h in N2/0.1%H2S gas atmosphere. Their corrosion mechanism, the structure of the formed scales, and the role of film-constituting elements during..... More

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