Korean Journal of Metals and Materials

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Author :

Heon-Young Ha

2 Articles

870

Evaluation of the Protective Ability of Air-formed Oxide and Passive Films Formed on Nb-Bearing High Interstitial Stainless Steels
Nb 활용 탄질소 스테인리스강의 부동태 및 대기산화 피막 보호성 연구

Chang-Geun Lee, Heon-Young Ha, Tae-Ho Lee, Kyung-Mox Cho
이창근, 하헌영, 이태호, 조경목

Korean J. Met. Mater. 2017;55(12):870-879. Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.870

Abstract
The effects of Nb on grain refinement and the pitting corrosion resistance of Fe_balance18Cr10 Mn0.3C0.3NxNb (x = 0.1 and 0.2 wt%) high interstitial alloys were investigated through microstructure analysis and potentiodynamic polarization tests. The resistance to pitting corrosion of the two alloys, covered with a passive film and an air-formed..... More

470

Acceleration of Nano-Sized NbC Precipitation and Improvement of Creep Resistance in Alumina-Forming Austenitic Stainless Steel via Cold Working
Alumina-Forming 오스테나이트계 스테인리스강의 냉간가공을 통한 미세 NbC 석출 촉진과 크리프 특성 향상

Hyun Hwa Park, Jun Yun Kang, Heon-Young Ha, Tae-Ho Lee, Hyun Uk Hong
박현화, 강전연, 하헌영, 이태호, 홍현욱

Korean J. Met. Mater. 2017;55(7):470-476. Published online 2017 Jul 4
DOI: https://doi.org/10.3365/KJMM.2017.55.7.470

Abstract
A feasibility study on microstructure design has been carried out to improve creep rupture life in alumina-forming austenitic (AFA) Fe-14Cr-20Ni-2.3Al stainless steel with and without 2 wt% W addition. After creep tests under 780 °C/80 MPa conditions, it was observed that internal cracks initiated primarily from grain boundaries in the..... More

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