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The Influence of S Addition and Aging Heat-Treatment on the Machinability in Austenitic Lightweight Steels
S 첨가 및 시효열처리에 의한 오스테나이트계 경량철강의 절삭성 변화에 관한 연구
Chang-Uk Lee, Kyeong-Won Kim, Chang-Hoon Lee, Hyungkwon Park, Seong-Jun Park
이창욱, 김경원, 이창훈, 박형권, 박성준
Korean J. Met. Mater. 2025;63(2):109-120.   Published online 2025 Feb 5
DOI: https://doi.org/10.3365/KJMM.2025.63.2.109

Abstract
Machining processes are crucial in industrial applications for shaping steel into specific structural products, and represent a significant portion of the product cost. However, the machinability of lightweight steel is poor, and it exhibits the characteristics of difficult-to-machine materials. This study investigated the effect of adding sulfur on the machinability..... More

                
Effect of Si on the Yield Strength of Medium-Carbon Steels Consisting of Ferrite and Pearlite
중탄소강의 페라이트-펄라이트 미세조직과 항복강도에 미치는 Si 첨가의 영향
Jae Hyeon Ko, Kyeong-Won Kim, Jae Hoon Jang, Ki-Young Lee, Hyun Park, Jung Han Kim, Jung Won Lee, Yong Hyun Kim, Sung Min Hong, Jun-Yun Kang, Yoon Suk Choi
고재현, 김경원, 장재훈, 이기영, 박현, 김정한, 이정원, 김용현, 홍성민, 강전연, 최윤석
Korean J. Met. Mater. 2024;62(11):897-910.   Published online 2024 Nov 5
DOI: https://doi.org/10.3365/KJMM.2024.62.11.897

Abstract
To enhance the intrinsic yield strength of the ferrite-pearlite microstructure that inevitably forms in a non-quenched-and-tempered steel for large structural components, this study analyzed the effect of adding Si. The resulting ferrite-pearlite microstructure in medium-carbon steels was examined, and the resulting increase in yield strength was interpreted based on strengthening..... More

                
Microstructures and mechanical properties of austenitic light-weight steels, and prediction of property distribution in large-scale slab
오스테나이트계 경량철강의 냉각 조건에 따른 미세조직, 기계적 특성 이해 및 대형 슬라브 내부 특성 분포 예측 연구
Tae-Ha Kim, Yoon Suk Choi, Kyeong-Won Kim, Seong-Jun Park, Jun Young Park, Kyeongjae Jeong, Heung Nam Han, Jong-Ho Shin
김태하, 최윤석, 김경원, 박성준, 박준영, 정경재, 한흥남, 신종호
Korean J. Met. Mater. 2020;58(12):830-842.   Published online 2020 Dec 4
DOI: https://doi.org/10.3365/KJMM.2020.58.12.830

Abstract
The effects of the cooling rate, after solution heat treatment, on the microstructures and mechanical properties of Fe-22Mn-8Al-0.8C-0.02Nb (low carbon) and Fe-20Mn-8Al-1.1C-0.1Nb (high carbon) light-weight steels were systematically investigated. The cooling process was controlled to achieve six different cooling rates, ranging from -0.016 to -465.1 oC/s. Under the slowest cooling..... More

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