• Title/Summary/Keyword: iron alloy

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Comparison of Cutting Characteristics between Cermet, Carbide and Coated Carbide Tools in Turning (선삭가공에서 서멧과 초경 및 코팅 초경공구의 절삭특성 비교)

  • 안동길
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.5
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    • pp.186-194
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    • 2000
  • The purpose of this study is to investigate the difference in cutting characteristics of cermet, carbide and coated carbide tools in the similar application range via turning test of various conditions. The cermet and carbide tools in the range of ISO P10 grade were developed using optimum compositions with a view to obtaining a high toughness and hardness by PM process. First mechanical properties were characterized on these tools. Experimental results of wear behaviour and resistance to fracturing were presented and discussed in the turning of gray cast iron and alloy steels by cermet, carbide and coated carbide tools. The coated carbide tool shows similar cutting performance compared to the cermet, while the cermet has better combination of wear resistance and toughness of high speed (V=500m/min) cutting in comparison with carbide and coated carbide tools, and also shows a potentiality for cast iron cutting. Fe adhesive behaviour on the tools and surface roughness of workpieces were explained by chemical affinity between tools and workpieces.

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Wear Resistance Characteristics of Thermal Sprayed AlSiMg/SiC Composite Coatings on Aluminum Engine Cylinder Bores (Aluminum Engine Cylinder Bore 적용 AlSiMg/SiC 복합 용사피막의 내마모 특성)

  • 양병모;변응선;박경채
    • Journal of Welding and Joining
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    • v.17 no.6
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    • pp.62-69
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    • 1999
  • The advantages of Thermal sprayed coatings as a replacement for cast iron liners are reduced weight, better heat transfer and reduced cost. One of the most important performance attributes of a cylinder bore coating is its wear resistance, since it must survive the abrasive sliding of both the piston rings and the piston skirt. In this study, composite powders were prepared by ball milling of Al-13Si-3Mg(wt%) alloy with SiC particles. The concentrations of SiC were 40 and 60wt%. The composite powders were sprayed using Metco-9MB plasma torch. Plasma sprayed coatings were heat-treated at 500℃ for 3 hours. The wear resistances of the plasma sprayed coatings were found to improve with heat treatment and superior to the commercially available G.C.I.(gray cast iron). AlSiMg-40SiC heat-treated coatings showed the best wear resistance in this study.

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Microstructural Characterization of Gas Atomized Copper-Iron Alloys with Composition and Powder Size

  • Abbas, Sardar Farhat;Kim, Taek-Soo
    • Journal of Powder Materials
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    • v.25 no.1
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    • pp.19-24
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    • 2018
  • Cu-Fe alloys (CFAs) are much anticipated for use in electrical contacts, magnetic recorders, and sensors. The low cost of Fe has inspired the investigation of these alloys as possible replacements for high-cost Cu-Nb and Cu-Ag alloys. Here, alloys of Cu and Fe having compositions of $Cu_{100-x}Fe_x$ (x = 10, 30, and 50 wt.%) are prepared by gas atomization and characterized microstructurally and structurally based on composition and powder size with scanning electron microscopy (SEM) and X-ray diffraction (XRD). Grain sizes and Fe-rich particle sizes are measured and relationships among composition, powder size, and grain size are established. Same-sized powders of different compositions yield different microstructures, as do differently sized powders of equal composition. No atomic-level alloying is observed in the CFAs under the experimental conditions.

Electroforming of Nickel-iron alloy and Iron (Ni-Fe 및 Fe 정밀 전주성형에 관한 연구)

  • Lee, Heung-Ryeol;Park, Jae-Yeong;Kim, Gyun-Tak;Kim, Ho-Hyeong;Hwang, Tae-Jin
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2011.05a
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    • pp.63-64
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    • 2011
  • 니켈 알러지를 일으키지 않는 전주 부품 개발을 위해 Ni을 대체할 수 있는 전주 소재로 Ni-Fe 합금과 Fe에 대한 전주 공정을 개발하였다. Ni-Fe 합금 전주의 경우 전주품의 표면 내식성 강화를 위해 Cr 나노입자를 이용한 복합전주를 실시하여, Ni 전주품과 내부식성, 니켈 용출 비교 분석 실험을 하였다. 또한 Ni을 완전히 배제하기 위해 새로운 시도로서 순 Fe 전주 공정 기술을 개발하였다. 제조된 Fe 전주품의 내식성 향상을 위한 실리카 코팅 등의 표면처리에 대한 효과도 분석하였다.

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Effect of Matrix Phase on the Abrasive Wear Behavior of the High Cr White Iron Hardfacing Weld Deposites (고크롬 철계 오버레이용접층의 긁힘마모거동에 미치는 기지상의 영향)

  • 백응률
    • Journal of Welding and Joining
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    • v.16 no.1
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    • pp.114-124
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    • 1998
  • The effect of matrix phase (austenite, pearlite, martensite) on the low stress abrasion resistance in the chromium-carbide-type high Cr white iorn hardfacing weld deposites has been investigated. In order to examine matrix phase, a series of alloys with different matrix phase by changing the ratio of Cr/C system by heat treatment were employed. The alloys were deposited twice on a mild steel plate using self-shielding flux cored arc welding process. The low stress abrasion resistance of the alloys against sands was measured by the Dry Sand/Rubber Wheel Abrasion Test(RWAT). Even though formation of pearlite phase in the matrix showed higher hardness than that of austenite, there was no observable difference in wear resistance between the pearlite and austenite phase for the same amount of chromium-carbide in the matrix. On the other hand, the formation of martensitic phase,, from heat treated austenitic alloys (high content of Cr), enhanced wear resistance due to its fine secondary precipitates.

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Effect of Al content on coating adhesion of hot rolled galvanized iron manufactured without pickling process (무산세 열연 용융아연도금강판의 도금밀착성에 미치는 도금욕 Al농도의 영향)

  • 전선호;최진원
    • Journal of Surface Science and Engineering
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    • v.32 no.1
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    • pp.31-42
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    • 1999
  • The effect was investigated that aluminium in the zinc bath has on the coating adhesion of Hot-rolled Galvanized Iron(HGI) manufactured without pickling process. It is thought that the coating adhesion of HGI manufactured without pickling process is good due to the fact that increasing aluminium content in the zinc bath makes zinc and aluminium diffuse to the cracks or pores in the scale formed through the reduction heat treatment, and Fe-Zn-Al compound with good ductility is formed in the scale layer and plays a role of anchor between zinc coating and substrate. It is possible that HGI with the good coating adhesion was produced without pickling treatment in the zinc bath with more that 3wt% of Al content even at the $550^{\circ}C$ of conventional reduction heating temperature. In creasing the temperature of heating section and aluminium content in the zinc bath prevents the Zn-Fe alloy. The corrosion resistance of HGI manufactured without pickling process is excellent because of the mixed reaction of zinc sacrifice and aluminium passivity film.

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Fabrication and Characterization of Immiscible Fe-Cu Alloys using Electrical Explosion of Wire in Liquid

  • Phuc, Chu Dac;Thuyet, Nguyen Minh;Kim, Jin-Chun
    • Journal of Powder Materials
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    • v.27 no.6
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    • pp.449-457
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    • 2020
  • Iron and copper are practically immiscible in the equilibrium state, even though their atomic radii are similar. As non-equilibrium solid solutions, the metastable Fe-Cu alloys can be synthesized using special methods, such as rapid quenching, vapor deposition, sputtering, ion-beam mixing, and mechanical alloying. The complexity of these methods (multiple steps, low productivity, high cost, and non-eco-friendliness) is a hinderance for their industrial applications. Electrical explosion of wire (EEW) is a well-known and effective method for the synthesis of metallic and alloy nanoparticles, and fabrication using the EEW is a simple and economic process. Therefore, it can be potentially employed to circumvent this problem. In this work, we propose the synthesis of Fe-Cu nanoparticles using EEW in a suitable solution. The powder shape, size distribution, and alloying state are analyzed and discussed according to the conditions of the EEW.

Hardenability of Ductile Cast Iron (구상흑연주철의 경화능)

  • Lee, Y.H.
    • Journal of the Korean Society for Heat Treatment
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    • v.1 no.1
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    • pp.13-23
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    • 1988
  • The hardenability of alloyed ductile cast irons was studied for 54 different alloy compositions obtained from eight commercial and laboratory foundries. The alloying elements investigated for their effects on hardenability were Si(2.0 to 3.0%), Mn(0.0 to 0.8%), Mo(0.0 to 0.6%), Cu(0.0 to 1.5%), and Ni(0.0 to 1.5%). Two hardenability criteria, a first-pearlite hardenability criterion and a half-hard hardenability criterion, were used to determine hardenability of ductile irons. Prediction models for each hardenability criterion were developed by multiple regression analysis and were well agreed with previous experimental results. Molybdenum was the most potent hardenability promoting element followed by manganese, copper and nickel ; silicon had little effect on hardenability and reduced the hardenability as silicon content increased. When alloying elements were presented in combination, strong synergistic effects on the hardenability were observed especially between molybdenum, copper and nickel. The hardenability of ductile iron was strongly influenced by austenitizing temperature. Increasing austenitizing temperature up to $955^{\circ}C$, hardenability increased gradually but decreasing rate and then decreased as temperature increased above $955^{\circ}C$. Unless reducing segregation by very long-time annealing treatment, the hardenability of ductile iron was not significantly influenced by segregation of alloying elements.

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Fabrication of Iron-Molybdenum Alloyed Nanoparticle and Nanowire using Chemical Vapor Condensation(CVC) (화학적 기상 응축(CVC)법을 이용한 철-몰리브덴합금 나노 입자와 와이어의 제조)

  • Ha, Jong-Keun;Cho, Kwon-Koo;Kim, Ki-Won;Ryu, Kwang-Sun
    • Journal of Powder Materials
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    • v.17 no.3
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    • pp.223-229
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    • 2010
  • Iron(Fe)-Molybdenum(Mo) alloyed nanoparticles and nanowires were produced by the chemical vapor condensation(CVC) process using the pyrolysis of iron pentacarbonyl($Fe(CO)_5$) and Molybdenum hexacarbonyl($Mo(CO)_6$). The influence of CVC parameter on the formation of nanoparticle, nanowire and size control was studied. The size of Fe-Mo alloyed nanoparticles can be controlled by quantity of gas flow. Also, Fe-Mo alloyed nanowires were produced by control of the work chamber pressure. Moreover, we investigated close correlation of size and morphology of Fe-Mo nanoparticles and nanowires with atomic quantity of inflow precursor into the electric furnace as the quantitative analysis. Obtained nanoparticles and nanowires were investigated by field emission scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction.

Fabrication and Evaluation of the Al-STS-Cu Functionally Graded Materials (알루미늄-스테인레스스틸-구리 경사기능재료의 제조 및 특성평가)

  • Kwangjae Park;Dasom Kim;Hansang Kwon
    • Composites Research
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    • v.36 no.4
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    • pp.241-245
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    • 2023
  • Aluminum (Al) and copper(Cu) are non-ferrous alloys with excellent electrical and thermal conductivity but have relatively lower mechanical properties than iron alloys. Stainless steel(STS), an iron alloy, is a high-strength industrial material due to its excellent mechanical properties and corrosion resistance compared to non-ferrous Al and Cu. In this research combined Al, Cu, and STS to fabricate as a functionally graded material (FGM) through a powder metallurgical process. The produced FGM exhibited lightweight and excellent surface hardness compared to copper and iron alloys and also showed higher thermal conductivity than single Al and STS materials.