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Korean J. Met. Mater.
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일방향 응고 CM247LC 초내열합금 크리프 시편 게이지에서 고온 산화가 표면 피트 및 재결정 형성에 미치는 영향
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최병학, 최광수, 한성희, 김대현, 안종기, 강동수, 서성문
Korean J. Met. Mater.
2023;61(12):951-957. Published online 2023 Nov 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.12.951
Abstract
This study analyzed a recrystallization phenomenon that occurred simultaneously with hightemperature oxidation on the surface of a directionally solidified CM247LC creep specimen, using optical and scanning electron microscopy. After heat treatment, the surface of the specimen subjected to the creep test at 982oC was oxidized by exposure to high temperature.....
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증기발생기 전열관용 Alloy 690 소재의 크리프 특성에 미치는 탄화물 형성의 영향
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김형규, 홍석민, 김종민, 김민철, 이영국
Korean J. Met. Mater.
2023;61(4):301-309. Published online 2023 Mar 22
DOI:
https://doi.org/10.3365/KJMM.2023.61.4.301
Abstract
The creep properties of Alloy 690, used as a steam generator tube material in nuclear power plants, were evaluated at 650°C, 750°C, and 850°C. The parameters of creep life prediction models were derived using the Larson-Miller (LM), Manson-Haferd (MH), and Orr-Sherby-Dorn (OSD) models, to use as mechanical properties under a.....
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일방향응고한 GTD-111 초내열합금의 황 함량에 따른 미세조직 및 고온 기계적 특성
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강동수, 이형수, 윤대원, 정희원, 유영수, 서성문
Korean J. Met. Mater.
2022;60(10):782-792. Published online 2022 Sep 29
DOI:
https://doi.org/10.3365/KJMM.2022.60.10.782
Abstract
The influence of trace amounts of sulfur (S) on the microstructural evolution, tensile and creep properties in directionally solidified (DS) Ni-based superalloy GTD-111 were systematically investigated. Doping of S in the range of < 1 to 154 ppm resulted in the formation of a Ti
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Alloy 282 초내열합금 모재 및 용접부의 기계적 특성과 미세조직에 미치는 시효열처리 조건의 영향
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방진혁, 강용준, 김남규, 서성문, 이상훈, 송상우, 강남현
Korean J. Met. Mater.
2020;58(8):540-549. Published online 2020 Jul 27
DOI:
https://doi.org/10.3365/KJMM.2020.58.8.540
Abstract
The effect of aging heat treatment conditions on the mechanical properties and microstructure of the base and weld metal of Alloy 282 superalloy was investigated. The aging heat treatment conditions employed in this study were as follows: two-steps (1010 °C for 2 hours plus 788 °C for 8 hours) and.....
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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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Crossref 6
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Fe-14Cr계 페라이틱 산화물 분산 강화강의 고온 압축 및 크리프 특성에 미치는 열처리의 영향
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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
Abstract
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.....
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Korean J. Met. Mater.
2017;55(7):486-491. Published online 2017 Jul 4
DOI:
https://doi.org/10.3365/KJMM.2017.55.7.486
Abstract
A new Ni based superalloy is considered as bucket material because of high fatigue resistance with fine grain. However a bucket is usually exposed to high temperature for a long time, so creep rupture tests were conducted to understand the microstructure evolution during creep deformation under various stresses at temperatures.....
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Crossref 1
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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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Crossref 6
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