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한국열처리공학회> 열처리공학회지> 제 7장 열처리에 의한 표면처리

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제 7장 열처리에 의한 표면처리

손명진
  • : 한국열처리공학회
  • : 열처리공학회지 34권4호
  • : 연속간행물
  • : 2021년 07월
  • : 191-198(8pages)
열처리공학회지

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UCI(KEPA)

간행물정보

  • : 공학분야  > 금속공학
  • : KCI후보
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  • : 격월
  • : 1225-1070
  • : 2508-4046
  • : 학술지
  • : 연속간행물
  • : 1988-2021
  • : 1495


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34권5호(2021년 09월) 수록논문
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1인공지능을 활용한 기계학습 앙상블 모델 개발

저자 : 이근원 ( K. W. Lee ) , 원윤정 ( Y.J. Won ) , 송영범 ( Y.B. Song ) , 조기섭 ( K. S. Cho )

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 34권 5호 발행 연도 : 2021 페이지 : pp. 211-217 (7 pages)

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To predict mechanical properties of secondary hardening martensitic steels, a machine learning ensemble model was established. Based on ANN(Artificial Neural Network) architecture, some kinds of methods was considered to optimize the model. In particular, interaction features, which can reflect interactions between chemical compositions and processing conditions of real alloy system, was considered by means of feature engineering, and then K-Fold cross validation coupled with bagging ensemble were investigated to reduce R2_score and a factor indicating average learning errors owing to biased experimental database.
(Received July 22, 2021; Revised August 13, 2021; Accepted August 30, 2021)

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2주조 및 불연속 석출물 미세조직을 가지는 Mg-Al 합금의 진동감쇠능

저자 : 전중환 ( Joong-hwan Jun )

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 34권 5호 발행 연도 : 2021 페이지 : pp. 218-225 (8 pages)

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In this study, damping capacities were comparatively investigated for Mg-9%Al alloy with as-cast (AC) and fully discontinuous precipitates (DPs) microstructures, respectively. The DPs microstructure was obtained by solution treatment at 678 K for 24 h, followed by furnace cooling to RT. The AC microstructure was typically characterized by partially divorced eutectic β(Mg17Al12) phase particles distributed along the α-(Mg) matrix cell boundaries. The DPs microstructure showed lamellar morphology consisting of α and β thin layers with various interlamellar spacings. The DPs microstructure had better damping capacity than the AC microstructure in the strain-amplitude independent region, while in the strain-amplitude dependent region, the damping behavior was reversed. In view of the microstructural features of AC and DPs, the lower concentration of Al in the α-(Mg) phase for the DPs microstructure and the lower β phase number density for the AC microstructure would be responsible for the higher damping capacities in the strain-amplitude independent and strain-amplitude dependent regions, respectively.
(Received August 3, 2021; Revised August 20, 2021; Accepted September 2, 2021)

KCI후보

3시효 열처리 된 Al-Si-Mg-Cu-(Ti) 합금의 고온 열팽창 계수 변화

저자 : 최세원 ( Se-weon Choi )

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 34권 5호 발행 연도 : 2021 페이지 : pp. 226-232 (7 pages)

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The relationship between precipitation and coefficient of thermal expansion of Al-6%Si-0.4%Mg- 0.9%Cu-(Ti) alloy (in wt.%) after various heat treatments were studied by the thermodynamic analyzer (TMA) and differential scanning calorimetry (DSC). Solution heat treatment of the alloy was carried out at 535℃ for 6 h followed by water quenching, and the samples were artificially aged in the air at 180℃ and 220℃ for 5 h. The coefficient of thermal expansion (CTE) curve showed some residual strain and decreased with increasing aging temperature. The CTE curves changed sharply in the temperature range of 200℃ to 400℃, and the corresponding peak shifted for the aged samples due to the change in the precipitation behavior of the secondary phase. These transformation peaks in the aged sample are related to the volume of the precipitation of the Si phase as determined by DSC analysis. The change in CTE is mainly caused by the precipitation of the Si phase in the Al- Si alloy, and the size of the change occurs simultaneously with the size of the precipitate.
(Received September 1, 2021; Revised September 9, 2021; Accepted September 15, 2021)

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4유기합금의 열처리조건에 따른 구성상의 제어와 최적 항균특성 측정방법의 선정

저자 : 박규하 ( Kyu-ha Park ) , 황대연 ( Dae Youn Hwang ) , 손홍주 ( Hong-joo Son ) , 최지웅 ( Ji Woong Choi ) , 김혜성 ( Hye Sung Kim )

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 34권 5호 발행 연도 : 2021 페이지 : pp. 233-238 (6 pages)

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The mechanical, anti-tarnishing, and corrosion characteristics of Yuggi (Cu-22wt%Sn) alloy are greatly affected by fraction of constituent phases according to heat treatment method. The Yuggi heat-treated at 750℃ has a β1' phase of 98% or more, which is a high-temperature disordered beta phase, on the other hand, cast Yuggi that Sn is solid-solutioned into Cu consists with α-phase over 60v/o. This difference of constituent phases of Yuggi may cause a difference in dissolution of Cu under antimicrobial test condition. Nonetheless, few studies have been conducted on the effect of fraction of constituent phases and constituent phases in antimicrobial activity. In addition, few studies have also been conducted on the suitable method measuring the antimicrobial activity of Yuggi. Hence, the purpose of this study is to provide an optimum measurement method of antimicrobial activity, and to evaluate quantitatively the effect of constituent phases on antimicrobial activity.
(Received September 2, 2021; Revised September 10, 2021; Accepted September 17, 2021)

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5HFCVD 증착 온도 변화에 따른 단결정 다이아몬드 표면 형상 및 성장률 변화

저자 : 권진욱 ( J. U. Gwon ) , 김민수 ( M. S. Kim ) , 장태환 ( T. H. Jang ) , 배문기 ( M. K. Bae ) , 김성우 ( S. W. Kim ) , 김태규 ( T. G. Kim )

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 34권 5호 발행 연도 : 2021 페이지 : pp. 239-244 (6 pages)

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Following Silicon Carbide, single crystal diamond continues to attract attention as a next-generation semiconductor substrate material. In addition to excellent physical properties, large area and productivity are very important for semiconductor substrate materials. Research on the increase in area and productivity of single crystal diamonds has been carried out using various devices such as HPHT (High Pressure High Temperature) and MPECVD (Microwave Plasma Enhanced Chemical Vapor Deposition). We hit the limits of growth rate and internal defects. However, HFCVD (Hot Filament Chemical Vapor Deposition) can be replaced due to the previous problem. In this study, HFCVD confirmed the distance between the substrate and the filament, the accompanying growth rate, the surface shape, and the Raman shift of the substrate after vapor deposition according to the vapor deposition temperature change. As a result, it was confirmed that the difference in the growth rate of the single crystal substrate due to the change in the vapor deposition temperature was gained up to 5 times, and that as the vapor deposition temperature increased, a large amount of polycrystalline diamond tended to be generated on the surface.
(Received September 9, 2021; Revised September 17, 2021; Accepted September 24, 2021)

KCI후보

6제 9장 열처리에 의한 표면처리

저자 : 손명진

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 34권 5호 발행 연도 : 2021 페이지 : pp. 245-249 (5 pages)

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1태양복사열 내부전도 성능향상을 위한 탄소 나노구조체 흑체코팅 열처리 효과연구

저자 : 김대원 ( Dae Weon Kim ) , 장성민 ( Seong Min Jang ) , 이두희 ( Du Hui Lee ) , 박준이 ( June Yi Park ) , 김영배 ( Young Bae Kim )

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 34권 4호 발행 연도 : 2021 페이지 : pp. 159-164 (6 pages)

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The Improvement of thermal performance using heat treatment of carbon nanotubes coated on the copper heat sink to take the radiation energy from solar ray for the energy harvesting in earth orbit. Using the additive coating of purified CNT for the increase of specific area and development of thermal conductive capacity, the performance of heat transfer is improved about 0.181 K/W while applying the power of 22 W under temperature of 3.98℃. Coating of purified CNT shows increase of area and volume of thermal layer however it led the partial thermal resistance.
(Received May 28, 2021; Revised June 4, 2021; Accepted June 9, 2021)

KCI후보

2텅스텐아크용접에 의한 Zirconium의 동종 및 이종용접 특성 분석

저자 : 김진영 ( Jin Yeong Kim ) , 황효운 ( Hyo-woon Hwang ) , 이대현 ( Dae Hyun Lee ) , 이재관 ( Jae Gwan Lee ) , 이동근 ( Dong-geun Lee )

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 34권 4호 발행 연도 : 2021 페이지 : pp. 165-170 (6 pages)

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Zirconium has excellent mechanical strength and high heat resistance and excellent corrosion resistance, and it is very important to study zirconium's dissimilar welding properties since it can be used in various applications under harsh environments. Similar welding of pure zirconium and dissimilar metal welding of pure zirconium and pure titanium were performed by TIG welding, and the welding properties were studied in association with microstructural and mechanical properties. In the Zr/Zr welded specimen, sound FZ and HAZ regions showed a basketweave microstructure composed of plate α phase. FZ region of Zr/Ti dissimilar welded specimen exhibited a maximum hardness value of 354.8 Hv, which is about three times higher than that of Ti base metal, due to the precipitation of very fine metastable ω and α phases in the beta matrix. In addition, due to the microstructural continuity in the FZ and HAZ regions, excellent elongation property of 21% was exhibited.
(Received June 3, 2021; Revised June 18, 2021; Accepted June 22, 2021)

KCI후보

3열간압연으로 제조된 STS 304L/A516-70N과 STS 316L/A516-70N 클래드재들의 미세조직에 대한 비교 연구

저자 : 진주찬 , 조수철 , 심호섭 , 이영국

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 34권 4호 발행 연도 : 2021 페이지 : pp. 171-178 (8 pages)

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In the present study, we comparatively investigated the microstructures of two hot-rolled stainless steel clad plates; STS 304L - low carbon steel A516-70N and STS 316L - A516-70N. The STS 304L/A516-70N clad plate (Clad_304L_Ni) had a Ni-interlayer between stainless steel and carbon steel and a 90 μm thick deformation band of unrecrystallized austenite grains on the stainless steel. The STS 316L/A516-70N clad plate (Clad_316L) had no interlayer and almost fully recrystallized austenite grains. Clad_304L_Ni exhibited the thinner a decarburized layer in carbon steel and a total carburized layer in stainless steel than Clad_316L. However, a severely carburized layer in stainless steel was thicker for Clad_304L_Ni than Clad_316L. Hardness profiles near the interface of clad plates matched well with microstructures at locations where the hardness values were measured.
(Received June 22, 2021; Revised June 30, 2021; Accepted July 6, 2021)

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4극초고강도 이차경화형 마르텐사이트강의 기계적성질에 미치는 오스포밍 공정의 영향

저자 : 김수빈 ( S. B. Kim ) , 원윤정 ( Y. J. Won ) , 송영범 ( Y. B. Song ) , 조기섭 ( K. S. Cho )

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 34권 4호 발행 연도 : 2021 페이지 : pp. 179-184 (6 pages)

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Two types of secondary hardening martensitic steels, 10Co-14Ni and 6Co-5Ni, were produced by vacuum induction melting to investigate the effect of ausforming process on mechanical properties. According to the results of present study, the alloy samples ausformed at low temperature indicated a rather low hardness level in overall aging time despite the refinement of martensite lath width. As the result can closely be related with the presence of primary carbides precipitated within the initial austenite matrix, we confirmed that, in ultrahigh strength secondary hardening martensitic alloy steels, the ausforming process can rather limit the degree of secondary hardening during the subsequent aging treatment.
(Received July 8, 2021; Revised July 15, 2021; Accepted July 21, 2021)

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5금형 냉각과 압출 속도가 7075 합금 압출에 미치는 영향에 대한 현상학적 분석

저자 : 성상규 ( S. G. Seong ) , 강현준 ( H. J. Kang ) , 이상용 ( S. Y. Lee )

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 34권 4호 발행 연도 : 2021 페이지 : pp. 185-190 (6 pages)

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The extrusion experiments using the 7075 aluminum billet have been performed to investigate the effects of die cooling and ram speed on the occurrence of surface defects on the extrudate. The purpose of die cooling was to suppress overheating of the extrudate at the moment of extrusion. In the present die cooling system, liquid nitrogen has been injected in to the die and sprayed to the surface of extrudate. Ram speed was either kept or varied in the range of 1.1~1.7 mm/sec. throughout one extrusion shot to check the occurrence of surface defects. Every extrusion started at a ram speed of 1.25 mm/sec. The temperature of extrudate was measured using a laser thermometer. The 7075 billet of 180 mm in diameter and 550 mm in length was preheated at 390oC and extruded to get a single plate of 8000 mm in length, 150 mm in width and 10 mm in thickness. Each extrudate was checked by eye to find the surface defects. The microstructures were obtained in the specimen cut from each corner of the extrudate using the EBSD micrographs.
(Received July 9, 2021; Revised July 16, 2021; Accepted July 22, 2021)

KCI후보

6제 7장 열처리에 의한 표면처리

저자 : 손명진

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 34권 4호 발행 연도 : 2021 페이지 : pp. 191-198 (8 pages)

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