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Kim, Bong-Seo,Yoo, Kyung-Jae,Kim, Byung-Geol,Lee, Hee-Woong 대한금속학회 2002 METALS AND MATERIALS International Vol.8 No.3
The segregation (distribution) of nickel and the composition of its constituents influence the low thermal expansion characteristics (Invar effect) in Fe-30 wt.% Ni-12.5 wt.% Co-xC Invar alloy. The change of coefficient of the thermal expansion and magnetic properties were studied as an aspect of carbon addition causing the segregation of Ni in primary austenite of as-cast Fe-30 wt.% Ni-12.5 wt.% Co Invar alloy. The coefficient of thermal expansion of Fe-30 wt.% Ni-12.5 wt.% Co-xC Invar alloy showed its lowest value at 0.08 wt.% carbon, increased with increasing carbon content in the range of 0.08∼1.0 wt.%C, kept constant at 1.0∼2.0 wt.%C and decreased at carbon higher than 2.0 wt.%. The effective distribution of the coefficient of nickel in as-cast Fe-30 wt.% Ni-12.5 wt.% Co-xC Invar alloy increased with increasing carbon content. The volume fraction of they phase of Fe-30 wt.% Ni-12.5 wt.% Co-xC alloy increased with increasing carbon content. The microstructure of Fe-30 wt.% Ni-12.5 wt.% Co-xC alloy changed with the carbon content was independent of the coefficient of thermal expansion. The Curie temperature changed linearly with the carbon content and was similar to the change of the coefficient of thermal expansion. Moreover, the coefficient of thermal expansion decreased when the ratio of saturation magnetization to Curie temperature (σ_s/T_c) increased, decreasing the Curie temperature and showed a specific relationship with the magnetic properties of the Fe-30 wt.% Ni-12.5 wt.% Co-xCInvar alloy.
Fe-Ni Invar 합금에서 나노 결정립 성장이 열팽창계수에 미치는 영향
임태홍,최병학,정효태,Yim, Tai Hong,Choe, Byung Hak,Jeong, Hyo Tae 한국재료학회 2014 한국재료학회지 Vol.24 No.10
The aim of this paper is to consider the effect of annealing on the coefficient of thermal expansion (CTE) of electroplated Invar Fe-Ni alloy. The CTE of the as-electroplated alloy is lower than those of alloys annealed at $400^{\circ}C$ and $800^{\circ}C$. XRD peaks become sharper as the as-electroplated alloy is annealed, which means the grain growth. The average grain sizes of as-electroplated and as-annealed alloys at $400^{\circ}C$ and $800^{\circ}C$ are 10 nm, 70 nm, and $2{\mu}m$, respectively, as determined by TEM and EBSD analyses. The CTE variation for the various grain sizes after annealing may come from the magnetostriction effect, which generates strain due to changes in the magnetization state of the alloys. The thermal expansion coefficient is considered to be affected by nano grain size in electroplated Fe-Ni Invar alloys. As grain size decreases, ferromagnetic forces might change to paramagnetic forces. The effect of lattice vibration damping of nano grain boundaries could lead to the decrease of CTE.
Invar 36 합금 선재의 미세조직에 미치는 냉간 인발 및 열처리 공정의 영향
한승엽 ( seung Youb Han ),장선아 ( Seon Ah Jang ),은희철 ( Hee-Chul Eun ),최정훈 ( Jung-Hoon Choi ),이기락 ( Ki Rak Lee ),박환서 ( Hwan Seo Park ),안도희 ( Do-Hee Ahn ),김수영 ( Soo Young Kim ),김재열 ( Jea Youl Kim ),신상용 ( San 대한금속재료학회(구 대한금속학회) 2016 대한금속·재료학회지 Vol.54 No.10
In this study, the effect of cold drawing and heat treatment on the microstructure of Invar36 alloy wire was investigated. Invar36 alloy wire is used as a transmission line core material, and is required to have high strength. The diameter of the Invar36 alloy wire specimens were reduced from 16 mm to 4.3 mm after three cold drawing and two heat treatment processed, thereby increasing tensile strength. Specimens were taken after each of the cold drawing and heat treatment processes, and their microstructure and tensile properties were analyzed. The Invar36 alloy γ-(Fe, Ni) phase matrix before the cold drawing and heat treatment processes. After the cold drawing processes, {220} and {200} textures were mainly achieved. After the heat treatment processes, a {220} recrystallization γ-(Fe, Ni)phase was formed with fine carbides. The recrystallization γ-(Fe, Ni) phase grains had low dislocation density, so they probably accommodated a large amount of deformation during the cold drawing processes.
최승건,김성현,최웅걸,이은상 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.9
Invar alloy is important material used for the OLED (Organic light emitting diode) shadow-mask in the mobile display industry due to its characteristics of smallest thermal expansion coefficient. Consumers in modern society demand higher display resolution. Electrochemical machining is one of the methods for obtained these high-resolution requirements. Electrochemical machining is a non-contact method that has advantages regarding defects like thermal strain and micro burrs compared to other non-conventional machining methods. For precision electrochemical machining using different shape electrodes, the current density should be controlled precisely. The purpose of this study is to apply the FEM (Finite elements method) analysis in order to investigate the current density in the electrochemical machining. And the current density distribution between invar alloy and electrode are carried out with shape electrode type and micro array film type under the same conditions by simulation methods. FEM analysis results show that using shape electrode type, current density distribution is very concentrated. And also by micro array pattern film, desired current density which is needed for electrochemical machining could be obtained easily. More precise electrochemical machining can be available by controlling the current density between the suitable type and invar alloy.
Na-Young Kang,Jae-Ho Lee 대한금속·재료학회 2023 ELECTRONIC MATERIALS LETTERS Vol.19 No.6
Fe–Ni invar alloy (Fe 64–Ni 36 wt%) has a very low coeffi cient of thermal expansion (CTE) than any other metals. For this reason, it has been used as fi ne metal mask (FMM) in RGB patterning of OLED manufacture process. However, as the resolution of OLED display is getting higher, the thickness of FMM is getting thinner and then the conventional extruded invar sheet cannot be used directly. The electrodeposition of invar can be the alternative for fabrication of thin FMM. In this study, the Fe–Ni alloy were electrodeposited varying bath compositions and current density. Also, the eff ects of ferric ion (Fe 3+ ), produced during electrodeposition on inert anode, on the behavior of deposition were investigated. Finally, the Fe–Ni alloy with 36–40 wt% Ni were obtained at 50 mA/cm 2 in 0.30 M Fe 2+ bath. The back side and front side composition of the deposits were analyzed to evaluate the composition uniformity of the Fe–Ni alloys. Generally, the Fe content of back side of the deposits were higher than that of front side.
인바합금 도금층의 물성에 영향을 미치는 도금인자에 관한 연구
김주환,정명원,임태홍,이재호,Kim, Ju-Hwan,Jung, Myung-Won,Yim, TaiHong,Lee, Jae-Ho 한국마이크로전자및패키징학회 2013 마이크로전자 및 패키징학회지 Vol.20 No.1
전기도금법을 이용한 인바합금의 전착시도금층의물성에 외부 작동변수가 미치는 영향을 알아보기 위해 전류밀도, duty cycle, pH, 온도를 변화시켜 도금을실시 한 후 도금층의 조성 변화 등을 분석하였다. 전류밀도와 온도의 변화에 따라 도금층의 조성이 변하였지만 duty cycle, pH, 온도의 변화는 도금층의 조성변화에 거의 영향을 미치지 않는다. 하지만 duty cycle 증가 시에는도금층의 미세구조가 변화하고 경도가 감소하는 경향이 관찰되었다. The experiments were carried out in the variation of current density, pH, temperature, and duty cycle to investigate the influence of electroplating parameters on the properties of Ni-Fe invar alloys. When the current density and temperature were changed, the composition of invar alloy was varied, however, duty cycle and pH hardly affected on the composition of electrodeposited alloys. However, as the duty cycle was increased, microstructure was changed and the decrease of hardness was also observed.
저열팽창 Ni<SUB>x</SUB>Fe<SUB>100-x</SUB> (x=36, 40, 44) 합금의 고온 변형 거동
윤동현(D. H. Yoon),이광석(K. S. Lee),정중은(J. E. Jung),장영원(Y.W. Chang),이정환(J.H. Lee) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.10
In this study, high temperature deformation behavior of low thermal expansion coefficient NixFe100-x (x=36, 40, 44) alloys was investigated at temperature ranging from 600 to 1200 ℃ at the strain rates between 10<SUP>-4</SUP> and 10<SUP>0</SUP> /s by conducting a series of compression tests. Both the temperature and strain rate dependence of the flow stress can be described via the hyperbolic sine function together with microstructural characterization. Based on the results, the empirical deformation map was also constructed, from which the contour conformed to high power dissipation efficiency could be exhibited as the feasible processing combination for each alloy.
HoonKee Park,Tae Hyung Lee,Sol A. Lee,In-Ho Jung,Ho Won Jang 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.2
Invar alloys have been widely used recently due to their extremely low coeffi cients of thermal expansion (CTE). The developmentof thin Invar alloy foils is essential for widespread use in the industry such as a shadow mask, fl exible display, and wearabledevices. Traditional Invar alloy fabrication process like rolling has fatal disadvantages in obtaining thin fi lms. Electroforminghas emerged as an important approach to overcome the current problem in terms of cost and thickness. However, till date,electroformed Invar alloys have BCC–FCC mixed phases and relatively high CTE due to nanoscale grain size. In this study,we incorporate Mn to the nanograin Invar alloy foils by electroforming process to stabilize the FCC phase, assisted by thermodynamicexpectation using FactSage. As the amount of Mn increases, the CTE decreases. Although electroformed Fe–Ni–Mnalloys have a relatively high CTE than conventional Invar alloys because it still has nanograins, the CTE could be further reducedby recrystallization process. Our results show that the incorporation of Mn into Invar alloys can stabilize the FCC phase nearthe room temperature, and electroforming is promising to replace the conventional rolling process for thin metal foils.
Ablation Drilling of Invar Alloy Using Ultrashort Pulsed Laser
IL-Young Chung,Jae-Do Kim,Kyung-Ho Kang 한국정밀공학회 2009 International Journal of Precision Engineering and Vol.10 No.2
Drilling a hole Invar alloy is accomplished by using a nanosecond pulsed Nd:YAG laser. However, this process has a few problems, such as heat effect and poor edge quality. Therefore, the ablation properties of the Invar alloy were investigated by using an ultrashort pulsed laser, which is a regenerative amplifirer Ti:sapphire laser with a 1 kHz repetition rate, a 184 fs pulse duration, and a 785 nm wavelength. To study the ablation characteristics of the Invar alloy, we measured the ablation shape, width, and ablatedd, at the energy fluence of a single pulse. The optimal condition for hole drilling is a z-axis tranfer depth of 4 μm, a circular feed rate of 0.2 mm/s, and a pulse energy of 26.4 μJ. A fine circular hole without burrs and thermal damage were obtained under the optimal processing conditions. The ultrashort pulsed laser system is an excellent tool for micro-hole drilling in Invar alloys without heat effects and poor edge quality.