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GTAW로 용접한 초내식성 오스테나이트계 스테인리스강 (UNS S31254) 열영향부의 내식성에 미치는 Ni계 용가재의 영향
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박진성, 조동민, 홍승갑, 윤태호, 김성진
Korean J. Met. Mater.
2023;61(6):404-413. Published online 2023 May 18
DOI:
https://doi.org/10.3365/KJMM.2023.61.6.404
Abstract
The effect of Ni-based fillers on corrosion resistance of welded super austenitic stainless steel (SASS) was examined. The use of Ni-based fillers for gas tungsten arc welded SASS leads to the formation of fine Cr-Mo enriched phase in its weld unmixed zone, which makes it more susceptible to the localized.....
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Powder Bed Fusion(PBF) 공정의 Laser rotation 적용 여부에 따른 17-4PH 스테인리스강 소재의 미세조직 및 기계적 특성 변화
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이승호, 윤종천, 어두림, 연시모, 최균석
Korean J. Met. Mater.
2023;61(6):397-403. Published online 2023 May 18
DOI:
https://doi.org/10.3365/KJMM.2023.61.6.397
Abstract
17-4 precipitation hardened stainless steel (17-4PH SS) has been reported to have excellent mechanical properties and excellent corrosion resistance, and is one of the materials used and studied with the powder bed fusion (PBF) method. Powder bed fusion (PBF) is a new manufacturing technology that has recently attracted attention in.....
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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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장진규, 박윤제, 이연학, 최재욱, 김현진, 허성보, 공영민, 김대일
Korean J. Met. Mater.
2022;60(9):668-672. Published online 2022 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2022.60.9.668
Abstract
Transparent and conductive ZnO 50 nm/Au 8 nm/ZnO 50 nm tri-layer films were deposited on poly-imide films by radio frequency (RF) and direct current (DC) magnetron sputtering at room temperature, and then the effect of electron irradiation on the crystallization, electrical resistivity and optical properties of the films was considered.....
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Web of Science 2
Crossref 2
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STS 347 오스테나이트계 스테인리스강의 재열균열에 미치는 석출물과 냉간 가공의 영향
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유일, 고석우, 김재윤, 황병철
Korean J. Met. Mater.
2022;60(2):102-113. Published online 2022 Jan 12
DOI:
https://doi.org/10.3365/KJMM.2022.60.2.102
Abstract
The aim of this study was to investigate the effect of precipitates and cold working on the reheat cracking of STS 347 austenitic stainless steel. Three different heat treatments to form NbC and M
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precipitates were applied to the STS 347 austenitic stainless steel and 10% pre-strain was additionally introduced.....
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Web of Science 2
Crossref 2
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슈퍼 오스테나이트계 스테인리스강 (UNS S31254)의 용접 및 용접 후 열처리 상태에서의 부식거동
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조동민, 박진성, 정원기, 홍승갑, 김성진
Korean J. Met. Mater.
2021;59(6):374-383. Published online 2021 May 26
DOI:
https://doi.org/10.3365/KJMM.2021.59.6.374
Abstract
The corrosion behaviors of a combined weld (plasma, gas tungsten arc) joint in a super austenitic stainless steel pipe were investigated using a range of experimental and analytical methods. To ensure superior corrosion resistance, a Ni-based super alloy (Inconel 625) was employed as the welding material only in the gas.....
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Web of Science 3
Crossref 2
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인공 신경망을 이용한 구오스테나이트 결정립계의 재구성 및 크기 예측
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김봉규, 구남훈, 이종혁, 한준현
Korean J. Met. Mater.
2020;58(12):822-829. Published online 2020 Dec 4
DOI:
https://doi.org/10.3365/KJMM.2020.58.12.822
Abstract
To automatically reconstruct the prior austenite grains from as-quenched martensitic structure, we applied a deep learning algorithm to recognize the prior austenite grains boundaries hidden in the martensitic matrix. The FC-DenseNet architecture based on FCN (fully convolutional networks) was used to train the martensite and ground truth label of the.....
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Web of Science 4
Crossref 3
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초고강도강 저항 점용접 연속타점시 전극의 국부적 합금화 현상이 용접품질 저하에 미치는 영향 연구
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김재원, Siva Prasad Murugan, 강남현, 박영도
Korean J. Met. Mater.
2019;57(11):715-725. Published online 2019 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.11.715
Abstract
Evaluation of electrode degradation in resistance spot welding of 1180TRIP steel was carried out through an electrode life test, and weldability testing was performed by the measurement of the nugget size, the peak load analysis and the measurement of the electrode tip size at 30 intervals. Analysis of the change.....
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Web of Science 7
Crossref 6
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Korean J. Met. Mater.
2019;57(11):708-714. Published online 2019 Oct 8
DOI:
https://doi.org/10.3365/KJMM.2019.57.11.708
Abstract
Resistance Element Welding (REW) is a novel processing technology developed to join dissimilar materials such as aluminum and steel. It uses an auxiliary steel rivet (element) inserted into an aluminum sheet that forms a resistance spot weld with the steel sheet, and the aluminum work piece is mechanically joined by.....
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Web of Science 6
Crossref 8
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자동차 도어보강재의 경량화 및 충돌특성 향상을 위한 형상 최적화 연구
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정우창
Korean J. Met. Mater.
2019;57(6):381-389. Published online 2019 May 16
DOI:
https://doi.org/10.3365/KJMM.2019.57.6.381
Abstract
A study on shape optimization of a hot-stamped automotive door impact beam for lightweight design and improved crash performance was conducted using a static collision analysis based on FMVSS 214. An integral type one-piece door impact beam of bracket parts and pipe was realized using hot stamping technology. The method.....
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초고강도 베이나이트강의 미세조직과 기계적 성질에 미치는 탄소함량과 항온열처리 온도의 영향
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황보승, 이홍범, 송영범, 함진희, 김홍규, 서동우
Korean J. Met. Mater.
2019;57(6):335-342. Published online 2019 May 16
DOI:
https://doi.org/10.3365/KJMM.2019.57.6.335
Abstract
The effect of carbon content and isothermal heat treatment conditions on the microstructure evolution and mechanical properties of ultra-high strength bainitic steels was investigated. A reduction in carbon content from 0.8 wt% to 0.6 wt% in super-bainite steel with typical chemistry effectively improved not only the Charpy impact toughness but.....
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Web of Science 1
Crossref 1
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오스테나이트 스테인리스강 튜브의 응력부식균열 민감도에 영향을 미치는 미세조직 및 잔류응력 비교
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이호중, 오승진, 김홍덕
Korean J. Met. Mater.
2019;57(1):51-59. Published online 2018 Dec 14
DOI:
https://doi.org/10.3365/KJMM.2019.57.1.51
Abstract
Three 304L austenitic stainless steel feedwater heater (FWH) tubes used in pressurized water reactors (PWRs) were investigated in this study. By comparing metallurgical differences, such as microstructural features, micro-hardness, and circumferential residual stress of the failed and non-failed FWH tubes by stress corrosion cracking (SCC), factors which could affect SCC.....
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Web of Science 5
Crossref 5
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10Cr1MoW강에서 응고속도에 따른 δ 페라이트 형성거동
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권순철, 주윤곤, 성창훈, 손명균, 신종호, 서성문, 이재현
Korean J. Met. Mater.
2018;56(8):589-596. Published online 2018 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.8.589
Abstract
Martensitic 10Cr1MoW steels are widely used for high temperature components in turbine engines because they have good mechanical properties and corrosion resistance. Delta-ferrite can form locally in large ingots and the ferrite phase degrades the metal’s high-temperature properties. To decrease the fraction of delta-ferrite the solidification process should be controlled......
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냉간압연 된 304 오스테나이트 스테인리스강의 열처리에 의한 기계적 특성 평가
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박민하, 김광윤, 장재호, 김형찬, 문형석, 전종배, 남대근, 손근용, 김병준
Korean J. Met. Mater.
2018;56(7):490-498. Published online 2018 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.7.490
Abstract
Austenitic stainless steels are widely used in a variety of industries, such as power plants, aerospace, automotive, construction and electronics, due to their excellent mechanical properties including ductility, toughness and corrosion resistance. For application in various industries, many parts and products require plastic processes such as cold rolling, cold forging.....
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Crossref 4
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오스테나이트계 스테인리스강 용접부 델타-페라이트의 열화에 따른 미세조직 변화가 기계적 물성 및 부식 특성에 미치는 영향
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박상규, 이호중, 이종현
Korean J. Met. Mater.
2018;56(4):296-303. Published online 2018 Apr 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.4.296
Abstract
347 austenitic stainless steel weld (ASSW) was thermally aged at 343, 400 and 450 °C up to 20,000 h in this study. Effects of thermal aging induced microstructure evolution on the mechanical properties and corrosion resistance of delta-ferrite in the 347 ASSW were qualitatively and quantitatively assessed by high resolution.....
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Crossref 1
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자동차 구조용 열연강판의 고주기 피로 특성에 미치는 전변형 효과
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하동욱, 정창열
Korean J. Met. Mater.
2018;56(3):177-186. Published online 2018 Mar 6
DOI:
https://doi.org/10.3365/KJMM.2018.56.3.177
Abstract
The drive towards weight reduction in the automotive industry has led to the use of high strength steel sheets for structural applications. Pressing and stamping are important processes in automotive production and result in additional straining on the vehicle body and chassis sheet material. It is therefore important to have.....
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Korean J. Met. Mater.
2018;56(1):49-58. Published online 2018 Jan 1
DOI:
https://doi.org/10.3365/KJMM.2018.56.1.49
Abstract
A bauxite of low quality containing 6.75% reactive silica and 37.4% Al
2
O
3
as gibbsite was roasted with additives including NaOH (caustic/total alumina molar ratio of 2-4:1) and CaO (CaO/total SiO
2
molar ratio of 0.5-3:1) at 300-1000 oC, producing calcines containing sodium aluminate (Na2O.Al
2
O
3
), silicates and hematite. Optimum conditions included roasting.....
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Crossref 2
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쾌삭 303계 스테인레스강의 열간성형성에 미치는 균질화처리, Mn/S 비 및 델타-페라이트의 영향
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정재영
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
Abstract
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.....
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Crossref 1
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교번스퍼터링법에 의해 다양한 기지상 재료위에 형성된 Au 나노입자의 성장거동에 대한 전기, 광학적 분석
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김범준, 김현철, 박종건, 이경석
Korean J. Met. Mater.
2017;55(10):739-744. Published online 2017 Sep 28
DOI:
https://doi.org/10.3365/KJMM.2017.55.10.739
Abstract
Nanocomposite films, which are comprised of metal nanoparticles dispersed in a matrix layer, have attracted great interest due to their unique electrical and optical properties, which are mainly due to the excitation of localized surface plasmons. In this study, we employed an alternating sputtering method to fabricate such nanocomposite films......
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STS304의 후열처리에 따른 용접부 미세조직과 기계적 특성 평가
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장대한, 김광윤, 김형찬, 전종배, 남대근, 손근용, 김병준
Korean J. Met. Mater.
2017;55(9):664-670. Published online 2017 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2017.55.9.664
Abstract
Austenitic stainless steels have excellent mechanical property and corrosion resistance, and are for these reasons used in demanding applications such as power plant, nuclear reactor and off-shore plant. Especially, austenitic stainless steel 304 (STS304) is mainly used as a pipe material in nuclear power plants. Submerged arc welding (SAW) is.....
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Crossref 7
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니켈감량 Fe-22Cr-9.5Mn-3.3Ni 오스테나이트강 주조재의 고온 변형성
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안상연, 송재숙, 홍순익
Korean J. Met. Mater.
2017;55(7):477-485. Published online 2017 Jul 4
DOI:
https://doi.org/10.3365/KJMM.2017.55.7.477
Abstract
The hot deformation behavior of as-cast and homogenized Fe-22Cr-9.5Mn-3.3Ni stainless steel was investigated over a temperature range between 600~1,250 ℃. The deformability of the as-cast Fe-22Cr-9.5Mn-3.3Ni steel decreased with increasing temperature up to 850 ℃, and then increased at temperatures between 900 and 1200 ℃ caused by dynamic recrystallization at.....
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연속주조의 유압식 주형진동 제어인자 고찰
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강기판, 김성연, 이상현
Korean J. Met. Mater.
2017;55(5):320-327. Published online 2017 May 9
DOI:
https://doi.org/10.3365/KJMM.2017.55.5.320
Abstract
In order to improve the flexibility of the oscillation pattern for a wide range of casting speeds, a hydraulic cylinder is used to oscillate the mold that moves up and down according to the stroke and frequency given by controller. Currently, hydraulic oscillators are commonly used in continuous casting facilities,.....
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자동차 에어백용 플렉시블 충격센서 모듈의 솔더 접합부 피로수명
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박지연, 김미송, 오철민, 도상현, 서종덕, 김대근, 홍원식
Korean J. Met. Mater.
2017;55(4):232-239. Published online 2017 Apr 6
DOI:
https://doi.org/10.3365/KJMM.2017.55.4.232
Abstract
To improve the sensitivity of impact sensor modules for automotive air bag systems, we developed a flexible module. The impact sensor was soldered with Sn-3.0Ag-0.5Cu (SAC305) solder on a flexible printed circuit board (FPCB) with an organic solderability preservative (OSP) surface finish. Thermal shock (TS) is one of the test.....
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Optical Devices & Energy Materials
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코발트실리사이드 상대전극을 채용한 염료감응형 태양전지의 물성 연구
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노윤영, 김광배, 송오성
Korean J. Met. Mater.
2017;55(1):39-45. Published online 2017 Jan 5
DOI:
https://doi.org/10.3365/KJMM.2017.55.1.39
Abstract
Cobalt silicide was used as a counter electrode to replace the Pt catalytic layer of a dye-sensitized solar cell (DSSC) device. 100 nm Si/ 100 nm Co on quartz was formed by sputtering and cobalt-silicides were formed by vacuum heat treatment at 500 ℃ and 700 ℃ for 30 min,.....
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