• 제목/요약/키워드: Monel

검색결과 13건 처리시간 0.023초

특수합금 사각봉 모넬 소재의 탄성영역 압출 및 인발 특성 비교 해석 (Comparative Analysis on Characteristics of Extrusion and Drawing for Monel Material of Special Alloy with Rectangular Bar in Elastic Limit)

  • 양영준
    • 한국산업융합학회 논문집
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    • 제27권3호
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    • pp.573-580
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    • 2024
  • Recently, the special alloy, for instance, such as Monel and Inconel, is used for valves, bolt/nuts, and fittings in semiconductor facility, FCEV(fuel cell electric vehicle) and hydrogen gas station, to reduce the hydrogen embrittlement. Even though the Monel material has high cost, it is recommended to use for the cases of ultra high pressure, ultra high leak-proof and so on. The purpose of this study is to investigate the characteristics of Monel material within elastic limit through the comparative analysis when Monel material is extruded or drawn. As the results, the deformation of Monel material was increased as the number of pass was increased, further, the deformation of Monel material by drawing was larger than that by extrusion. In the safety factor, the case that load is less than 420kN, the plastic deformation due to drawing could be happened faster than that due to extrusion. However, the case of more than 420kN, it showed that the plastic deformation for extrusion and drawing was almost similar.

특수합금 사각봉 모넬 소재의 인발 소성변형 및 롤러 특성 해석 (Analysis on Characteristics of Drawing Plastic Deformation for Rectangular Monel Material with Special Alloy and Rollers)

  • 이영식;양영준
    • 한국산업융합학회 논문집
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    • 제25권6_2호
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    • pp.961-968
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    • 2022
  • Hydrogen embrittlement leads to the damages in bolts, nut, especially, high pressure valves, in the semiconductor facilities, hydrogen vehicles, hydrogen stations and so on. Monel material has higher strength than SUS material. Therefore, even though Monel material with special alloy is usually used to prevent the hydrogen embrittlement, it needs powerful drawing system to manufacture the rectangular or hexagonal bar using circular bar. The purpose of this study is to investigate the characteristics of plastic deformation of Monel material and 2 rollers of rolling unit in plastic limit through numerical analysis. As the results, it was predicted that, based on mean stress, as the rolling step was increased, the rolling force of rolling unit was decreased. In addition, the heat treatment for Monel material was needed because of residual stress due to plastic deformation. As for rollers, the roller was safe about 1.86 times compared with that of ultimate strength. In this study, as the roller 2 showed larger stress than roller 1, thus, roller 2 should be designed carefully to guarantee the safety. Further it was confirmed that the reaction force of roller could be helpful in bearing design.

액상 침적에 의한 Monel 400기지상에 형성된 Al-Cu 합금 코팅층의 조직 및 경도 (Microstructure and Hardness of Al-Cu Alloy Coating on Monel 400 by Hot Dipping)

  • 조선욱;이임렬
    • 한국표면공학회지
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    • 제29권4호
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    • pp.278-285
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    • 1996
  • The structure of coating layer formed by hot dip Al-Cu alloy coating on Monel 1400 metal was studied. The coating layer consists of alloyed layer adjacent to the Monel 400 substrate and Al-Cu alloy. It was found that the hardness of coating increased with dipping time and heat treatment associated with the diffusion and the formation of intermetallic compound at the interface. However the thickness of coating layer was decreased at high dipping temperature due to tile higher viscosity of liquid coating alloy. Diffusion heat treatment at $600^{\circ}C$ after coating resulted in the disappearence of adhered Al(Cu) and $CuAl_2$ phases, and then they transformed into the new phases of CuAl and Al7Cu4Ni at coating layer.

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모넬(Monel)-Clad 파이프의 오버레이 용접 적층수가 용접성에 미치는 영향에 관한 실험적 연구 (Experimental Research on the Effect of the Number of Layers by Overlay Welding of Monel-Clad Pipe on Weldability)

  • 최혁;박준홍
    • 한국산학기술학회논문지
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    • 제17권11호
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    • pp.42-50
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    • 2016
  • 오버레이 용접은 희석율에 의해 적층 두께에 따라 화학성분 함량과 용접부의 경도에 영향을 미치며 이는 파이프 제품의 표면성질을 결정한다. 이로 인해 오버레이 용접은 적층의 수를 고려하여야 한다. 본 연구에서는 탄소강 모재에 내부식성 소재인 모넬 소재를 오버레이 용접하여 적층수에 따른 Fe함량, 모재와 모넬 소재와의 용접성, 부위별 경도와 표면 평탄도를 실험적으로 연구하였다. 각각의 평가는 평판의 모재와 파이프 모재에 3개의 층으로 오버레이 용접 후 실시하였다. Fe함량은 각 층별 시료를 채취하여 성분 분석을 통해 평가하였으며, 3Layer에서 만족하는 함량을 나타내었다. 또한 적층별 시편을 밴딩 시험하여 용접성을 평가하였다. 적층별 경도와 비드 평탄도는 Micro Vickers와 3차원 측정을 통해 평가하였다. 경도는 1Layer에서 발생하는 HAZ부에 의해 가장 높은 경도 값을 보였으며, 적층이 증가할수록 경도가 감소하였다. 비드 평탄도의 경우 적층수 증가에 따라 편차가 급격한 차이가 발생하였으며, 이는 경도와 함께 사용 목적의 측면에서 주의 깊게 고려해야 한다. 이러한 실험적 결과는 목적에 따른 용접 파이프 적층수의 결정 방법을 나타내었다.

줄-톰슨 극저온 냉각기용 벨로우즈의 변형해석 (Deformation Analysis of Self-regulating Bellows in Joule-Thomson Cryocooler)

  • 이상은;이태원
    • 한국정밀공학회지
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    • 제25권4호
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    • pp.100-107
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    • 2008
  • Bellows is an important component in Joule-Thomson cryocooler, which minimize the excessive flow of the cryogenic gas. The bellows is made of Monel 400 and its geometry is an axial symmetric shell. During cool-down process, the pressure and volume within bellows must be satisfied with Benedict-Webb-Rubin state equation. Moreover, Poisson's ratio of Monel 400 is nearly constants, but its Young's modulus varies for a drop in temperature. Under these conditions, bellows contracts in the axial direction like a spring. To evaluate deformation of bellows at cryogenic temperature, the numerical calculation of the volume within bellows and finite element analysis are iteratively used in this research. the numerical results show that deformation of the bellows is approximately linear for change of temperature.

땀이 금속안경테에 미치는 영향 (Effects of Sweat on the Metal Frames of Eyeglasses)

  • 김소라;최명진;황재원;김명수;정서영;박미정
    • 한국안광학회지
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    • 제20권1호
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    • pp.9-14
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    • 2015
  • 목적: 본 논문에서는 안경테가 땀에 노출되었을 때 나타나는 변화를 알아보았다. 방법: 양백, 모넬 및 티타늄 재질의 안경테를 pH 6.5, 6.0, 5.0의 인공땀에 1주, 3주, 6주 동안 노출시킨 후 표면, 경도, 인장강도의 변화를 알아보았다. 결과: 인공땀에 의해 양백, 모넬, 티타늄 재질 안경테 표면의 부식이 유발되었으며 부식 양상은 각 재질별로 상이하였다. 인공땀의 pH와 노출시간에 비례하여 3가지 재질의 안경테 모두 경도가 감소하였으나 인장강도는 변화가 없었다. 결론: 인공땀에 의해 안경테의 표면 부식과 경도 변화가 관찰되었으므로 안경테의 일상적인 관리가 필요함을 제안한다.

On propagation of elastic waves in an embedded sigmoid functionally graded curved beam

  • Zhou, Linyun;Moradi, Zohre;Al-Tamimi, Haneen M.;Ali, H. Elhosiny
    • Steel and Composite Structures
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    • 제44권1호
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    • pp.17-31
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    • 2022
  • This investigation studies the characteristics of wave dispersion in sigmoid functionally graded (SFG) curved beams lying on an elastic substrate for the first time. Homogenization process was performed with the help of sigmoid function and two power laws. Moreover, various materials such as Zirconia, Alumina, Monel and Nickel steel were explored as curved beams materials. In addition, curved beams were rested on an elastic substrate which was modelled based on Winkler-Pasternak foundation. The SFG curved beams' governing equations were derived according to Euler-Bernoulli curved beam theory which is known as classic beam theory and Hamilton's principle. The resulted governing equations were solved via an analytical method. In order to validate the utilized method, the obtained outcomes were compared with other researches. Finally, the influences of various parameters, including wave number, opening angle, gradient index, Winkler coefficient and Pasternak coefficient were evaluated and indicated in the form of diagrams.

Magnesium diboride(MgB2) wires for applications

  • Patel, Dipak;Kim, Jung Ho
    • 한국초전도ㆍ저온공학회논문지
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    • 제18권1호
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    • pp.1-5
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    • 2016
  • Field and temperature dependence of the critical current density, Jc, were measured for both un-doped and carbon doped $MgB_2/Nb/Monel$ wires manufactured by Hyper Tech Research, Inc. In particular, carbon incorporation into the $MgB_2$ structure using malic acid additive and a chemical solution method can be advantageous because of the highly uniform mixing between the carbon and boron powders. At 4.2 K and 10 T, Jc was estimated to be $25,000-25,300Acm^{-2}$ for the wire sintered at $600^{\circ}C$ for 4 hours. The irreversibility field, $B_{irr}$, of the malic acid doped wire was approximately 21.0 - 21.8 T, as obtained from a linear extrapolation of the J-B characteristic. Interestingly enough, the Jc of the malic acid doped sample exceeds $10^5Acm^{-2}$ at 6 T and 4.2 K, which is comparable to that of commercial Nb-Ti wires.

마우스 사출성형금형의 냉각 특성 향상을 위한 열전도성 금형 설계 (Design of the Thermally Conductive Mould to Improve Cooling Characteristics of Injection Mould for a Mouse)

  • 안동규;김현우;이기용
    • 대한기계학회논문집A
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    • 제33권3호
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    • pp.201-209
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    • 2009
  • The objective of present research work is to design the heat conductive mould to improve cooling characteristics of the injection mould for a mouse. In order to obtain the high cooling rate of the mould, a heat conductive mould with three different materials was designed. The materials of the base structure, the mid-layer and the molding part of the heat conductive mould were chosen as Cu-Ni alloy (Ampcoloy 940) to improve the heat conductivity of the mould, Ni-Cu alloy (Monel 400) to reduce a thermal stress, injection tool steel (P21), respectively. Through the three-dimensional transient heat transfer analysis and the thermal stress analysis, the effects of the geometrical arrangement of each material on the cooling characteristics and the thermal stress distribution were examined. From the results of the analyses, a proper design of the thermal conductive mould was obtained.