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Table of Contents | December, 2017  Vol. 55   No.12 Previous Issue | Next Issue | Archive
In this issue:

Research Papers
825 Effect of Cooling Rate on the Microstructure and Mechanical Properties of Fe-Mn-Al-C Light-Weight Steels
Fe-Mn-Al-C계 경량철강의 미세조직 및 기계적 물성 변화에 미치는 냉각속도의 영향
Jun Young Park, Seong-Jun Park, Jae-Hyun Lee, Joonoh Moon, Tae-Ho Lee, Kyeong Jae Jeong, Heung Nam Han, Jong-Ho Shin
박준영, 박성준, 이재현, 문준오, 이태호, 정경재, 한흥남, 신종호
Korean J. Met. Mater. 2017;55(12):825-835.   Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.825

The effects of cooling after solution heat treatment on the microstructure and mechanical properties of light-weight steels were investigated using Fe-30Mn-xAl-0.9C alloys containing 9.0–12.8 wt% Al. Lab-scale specimens (thickness: 10 mm) of the alloys were cooled by different cooling rates from -337 to -0.053 ℃/s using water, air, and furnace..... More

836 AISI 304 Steel Brazing Using A Flexible Brazing Foil Fabricated by Tape Casting Method
Ashutosh Sharma, Soon-Jae Lee, Joo-Hee Oh, Jae Pil Jung
Korean J. Met. Mater. 2017;55(12):836-844.   Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.836

The authors report the fabrication of a flexible nickel brazing foil using powdered nickel alloy filler (BNi-2) mixed with an organic binder. The organic binder was composed of a polyacrylic acid polymer, glycol, carbon tetrachloride, and water as a dispersion medium for the powder. The brazing paste so formed was..... More

845 Development of the Elastic Modulus of 100 GPa Casting Alloys by Nickel Addition
니켈 첨가에 의한 탄성 100 GPa급 알루미늄 주조재 개발
Tae-Gyu Lee, Hoo-Dam Lee, Jong-Kuk Lee
이태규, 이후담, 이종국
Korean J. Met. Mater. 2017;55(12):845-852.   Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.845

In this research, we studied the effects of Ni, Ti, and B on the elastic modulus of hypereutectic Al-Si alloys and successfully synthesized 100 GPa Al casting alloys by designing various alloys phases. Generally, Al–Si based alloys are known in the automotive industry to be good casting alloys with high..... More

853 Bake-hardening Properties of Al-0.6Mg-1.2Si Alloy Sheets Fabricated by Twin Roll Casting
박판주조법으로 제조한 Al-0.6Mg-1.2Si 합금판재의 소부경화특성
Gi-Cheol Ju, Yun-Soo Lee, Min-Seok Kim, Hyoung-Wook Kim, Yang-Do Kim
주기철, 이윤수, 김민석, 김형욱, 김양도
Korean J. Met. Mater. 2017;55(12):853-861.   Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.853

The effect of pre-aging treatment on the microstructure and mechanical properties of Al-0.6Mg-1.2Si aluminum alloy sheets fabricated by twin roll casting (TRC) was investigated. It was observed that two kinds of nanoclusters, cluster(1) and cluster(2), play an important role in the bake-hardening properties of Al-Mg-Si aluminum alloy. The hardness of..... More

862 Effect of Heat-Treatment on the Elevated Temperature Compression and Compressive Creep Properties of Fe-14Cr Ferritic Oxide Dispersion Strengthened (ODS) Steel
Fe-14Cr계 페라이틱 산화물 분산 강화강의 고온 압축 및 크리프 특성에 미치는 열처리의 영향
Young-Kyun Kim, Yeun-Ah Joo, Jong-Kwan Park, Hwi-Jun Kim, Man-Sik Kong, Kee-Ahn Lee
김영균, 주연아, 박종관, 김휘준, 공만식, 이기안
Korean J. Met. Mater. 2017;55(12):862-869.   Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.862

This study investigated the microstructure and the ambient-elevated temperature compression and elevated temperature creep properties of Fe-14Cr ferritic ODS steel manufactured by mechanical alloying (high energy ball milling) and hot extrusion processes. Initial microstructural observation of the as-extruded material identified elongated grains in the direction of extrusion; however, some recrystallization..... More

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

The effects of Nb on grain refinement and the pitting corrosion resistance of Febalance18Cr10 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

880 Effects of Homogenization Treatment, Mn/S ratio and δ -ferrite on the Hot Workability of Free-Machining 303-series Austenitic Stainless Steels
쾌삭 303계 스테인레스강의 열간성형성에 미치는 균질화처리, Mn/S 비 및 델타-페라이트의 영향
Jae-Young Jung
Korean J. Met. Mater. 2017;55(12):880-887.   Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.880

To improve the hot-workability of free-machining austenitic stainless steel, we studied the effects of homogenization treatment, Mn/S ratio and the retained δ-ferrite on the hot-workability of 303 austenitic stainless steels. The reduction of area was measured as a function of homogenization temperature in the range of 1160-1250 ℃ and 1-50..... More

888 Effects of Solution and Aging Treatments on the Microstructure and Mechanical Properties of Al-5.2Si-3.4Cu-0.28Mg Alloy
Al-5.2Si-3.4Cu-0.28Mg 합금의 미세조직 및 기계적 특성에 미치는 용체화 및 시효 열처리의 영향
Yi Je Cho, Jeki Jung, Yong Ho Park
조의제, 정제기, 박용호
Korean J. Met. Mater. 2017;55(12):888-895.   Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.888

Since strength and ductility have a trade-off relationship in Al alloys, controlling these properties using heat treatments requires careful attention to the dissolution and evolution of the reinforcing phases. In this study, the effects of solution and aging treatments on the microstructure and mechanical properties of Al-5.2Si-3.4Cu-0.28Mg alloy were investigated...... More

896 Charging Behavior of Sinter Feed according to Types of Charging Chute
장입 슈트 형태에 따른 소결 원료 장입 거동
Kang-Min Kim, Ki-Woo Lee, Jae-Hong Kwon, Hae-Kwon Jeong, Jeong-Whan Han
김강민, 이기우, 권재홍, 정해권, 한정환
Korean J. Met. Mater. 2017;55(12):896-904.   Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.896

In the iron ore sintering process, a thermal imbalance can occur in the sinter feed bed which degrades the quality of the sintered ores. In order to solve this thermal imbalance, it is necessary to control the sizes of the sintering feed charging through the chute by designing an appropriate..... More

905 Study on the Water Durability of Molybdate Glasses with B2O3 as Low Temperature Sealing Materials
Jae-Young Shin, Jae-Min Cha, Dae-Sung Kim, Dea-Geol Jeong, Jun-Hyeon Bae, Bong-Ki Ryu
Korean J. Met. Mater. 2017;55(12):905-910.   Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.905

The boron alkali molybdate glass system was investigated as lead-free low-temperature melting sealing materials, with different boron oxide contents between 0 and 8 mol%. The glasses were characterized using X-ray diffraction (XRD), differential scanning calorimetry (DSC), infrared spectroscopy (IR), and by densities. Their chemical properties were measured by their dissolution..... More

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