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Korean J. Met. Mater.
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Korean Journal of Metals and Materials
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집속이온빔 가공 처리된 오스테나이트 스테인리스강의 표면 손상층 제어 방법
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진형하, 류이슬
Korean J. Met. Mater.
2023;61(2):137-143. Published online 2023 Jan 27
DOI:
https://doi.org/10.3365/KJMM.2023.61.2.137
Abstract
There is substantial concern about the phase change to artificial ferrite or martensite in commercial austenitic stainless steels during intense focused-ion-beam milling. In this work, severe Ga ion milling to prepare microscale samples was found to produce thin transformed layers on the surface of austenitic stainless steel. The surface BCC.....
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Korean J. Met. Mater.
2022;60(6):432-439. Published online 2022 May 24
DOI:
https://doi.org/10.3365/KJMM.2022.60.6.432
Abstract
A dual laser beam joining process is introduced for joining dissimilar plastics. A customized laser head was built, and two different diode lasers with central wavelengths of 980 and 1940 nm were simultaneously applied to obtain PMMA/PC-1 and PC-2/ABS joints. Various experimental conditions were employed for the dual laser beam.....
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Korean J. Met. Mater.
2019;57(2):115-123. Published online 2019 Jan 9
DOI:
https://doi.org/10.3365/KJMM.2019.57.2.115
Abstract
The compression process is one of the more widely used industrial manufacturing methods for fabricating desired shape of specimens with various materials such as metals and ceramics. In the compaction process, the upper punch moves into the powder, and force is transmitted between particles, then achieving densification. In this process,.....
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니켈기 Inconel 740H 초내열합금과 고Cr계 Gr.92 내열강의 이종금속 용접부의 미세조직 및 크리프 파단 특성
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신경용, 이지원, 한정민, 이경운, 공병욱, 홍현욱
Korean J. Met. Mater.
2018;56(5):375-383. Published online 2018 May 8
DOI:
https://doi.org/10.3365/KJMM.2018.56.5.375
Abstract
Microstructure evolution and the creep fracture characteristics of dissimilar welds between Ni-based superalloy Inconel 740H and High Cr ferritic steel Gr.92 were investigated. The dissimilar welds were fabricated by shielded metal arc (SMA) welding process with Ni-based austenitic Inconel 182 superalloy. Postweld heat treatment at 760
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22Cr-9Mo-3Fe-4Nb 니켈기 초내열합금의 저주기 피로에 따른 미세조직변화
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송영석, 석진익, 강정윤
Korean J. Met. Mater.
2017;55(9):609-614. Published online 2017 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2017.55.9.609
Abstract
A new Ni based superalloy with high fatigue resistance and fine grain was considered as a material for high-pressure buckets in fossil fuel power plants. Since such buckets are usually exposed to extreme operating conditions, low cycle fatigue tests were conducted to understand the microstructure evolution of the material during.....
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Alumina-Forming 오스테나이트계 스테인리스강의 냉간가공을 통한 미세 NbC 석출 촉진과 크리프 특성 향상
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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.....
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전자기주조법으로 제조된 Al-12Si계 합금의 미세조직 및 고온 소성변형 거동
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전경수, 노흥렬, 김목순, 김종호, 박준표
Korean J. Met. Mater.
2017;55(6):386-395. Published online 2017 Jun 1
DOI:
https://doi.org/10.3365/KJMM.2017.55.6.386
Abstract
An as-received EMC/S (electromagnetic casting and stirring)-processed Al-12Si based alloy billet was homogenized to examine its microstructure and high temperature plastic deformation behavior, using compressive tests over the temperature range from 623 to 743 K and a strain rate range from 1.0×10
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Korean J. Met. Mater.
2017;55(4):222-226. Published online 2017 Apr 6
DOI:
https://doi.org/10.3365/KJMM.2017.55.4.222
Abstract
An AlCrTiSiN film composed of 31Al-15Cr-1.7Ti-0.5Si-51.8N (at%) was deposited on a steel substrate by arc ion plating to a thickness of 1 μm. It consisted of nano crystalline hcp-AlN and fcc-CrN. Its corrosion behavior in Ar-1%SO
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gas at 800 ℃ for 5-50 h was studied. The resulting scales consisted primarily.....
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TiC-SKD11 함침 복합재의 온도에 따른 인장 특성과 파괴거동 변화
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오누리, 이상관, 조승찬, 조일국, 황금철, 김대하, 조영태, 서동우, 홍현욱
Korean J. Met. Mater.
2017;55(3):156-164. Published online 2017 Mar 3
DOI:
https://doi.org/10.3365/KJMM.2017.55.3.156
Abstract
A composite having 60 vol% of TiC particles was successfully fabricated by the infiltration of molten SKD11 tool steel into a TiC preform. The density of this composite was achieved to be 25% lighter than conventional steels. The penetration of the liquid metal reached geometrically complex regions without any interfacial.....
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Materials Analysis & Characterization
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미세쌍정의 투과전자현미경 해석
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류근걸, 하미영, 이강득
Korean J. Met. Mater.
2016;54(9):711-715. Published online 2016 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.9.711
Abstract
Micro-twinning has been investigated in some state-of-the-art materials by transmission electron microscopy, but such characterizations have not been clear so far. Micro-twins must be characterized by identifying their spots in the electron diffraction pattern, which is very unique compared to normal defects such as dislocations or stacking.....
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