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몰리브덴이 첨가된 Stellite 6 합금의 마모와 부식특성
申種喆,金在洙,李德悅,梁在雄,尹珍國,盧大虎,李種權 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.10
Hardfacing layers of Stellite 6 with different molybdenum content are deposited on AISI 1045-carbon steel using Plasma Transferred Arc welding(PTA) machine. The microstructures, wear and corrosion resistances of the hardfacing layer are investigated in order to clarify the effect of molybdenum in Stellite 6 alloys. The microstructural characterizations of the hardfacing layers are performed using X-ray diffraction, back scattered electron images, and scanning electron microscopy. With an increase of Mo contents, M_6C type carbide are formed instead of Cr-rich type carbides, and so this microstructural change enhanced the mechanical properties such as wear and corrosion resistance of a Mo-modified Stellite 6 alloy.
Molten Carbonate Fuel Cell 용 Ni-Al anod 에서 미세구조가 creep 특성에 미치는 영향에 관한 연구
이덕열,김남진,임희천,윤호경 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.4
To improve the creep resistance of the anode for molten carbonate fuel cell, the fabrication processes of Ni anode with different Al contents were investigated, where four types of sintering condition have been examined at different temperatures and gas atmospheres. The effects of such different sintering conditions on the secondary phases, and the morphologies of secondary phase of the anode were examined. If Al is added over the solid solution limit, Ni₃Al or Al₂O₃ are formed as a secondary phase according to the sintering conditions and degrees of creep strain and conductivity are changed as results. The creep test and porosimeter analysis certificated that the Ni₃Al intermetallic compound precipitation and Al₂O₃ dispersion hardened structure had good creep resistances with suitable pore size distributions for anode, which resulted in the stable mechanical performances.
Substrate 에 증착된 비정질 합금의 Ⅹ선회절 분석
이덕열 대한금속재료학회(대한금속학회) 1984 대한금속·재료학회지 Vol.22 No.7
It has quite often been observed that the interference functions of rare earth metal-transition metal amorphous alloys, which are prepared only by vapor deposition, show considerable deviation from the expected when evaluated directly from their X-ray diffraction intensity patterns. In this study efforts were made to find the causes and solutions thereof and, for that matter, X-ray diffraction experiments were performed both in transmission and reflection geometries on amorphous Co-Gd alloy films sputtered on a Be-substrate. It was found that, for a specimen on a substrate in reflection geometry, an adequate modification on the data reduction procedures or specifically the absorption correction should be made depending on the configuration of the specimen and substrate. Also it was realized that the data reduction procedure is relatively simpler when the substrate faces towards the incoming X-ray beam than the contrary.
이덕열,박기선 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.8
Amorphous Ni_xZr_(100-x)(35≤×≤75) powders were produced by mechanical alloying of elemental powders and the short range order of the amorphous Ni_(35)Zr_(65), Ni_(45)Zr_(55), Ni_(55)Zr_(45) and Ni_(65)Zr_(35) alloys was characterized using X-ray diffraction. The partial interference functions, I_(NiNi)(K), I_(NiZr)(K) and I_(ZrZr)(K), were calculated from the total interference functions of the latter three alloys. The nearest neighbor distances for Ni-Ni, Ni-Zr and Zr-Zr atomic pairs in the amorphous Ni-Zr mechanical alloys turned out to be 2.400 2.654 and 3.282Å, respectively. The coordination number was 12.4∼12.9 depending on the composition. It was concluded that the atoms in the amorphous Ni-Zr alloys didn't behave like hard spheres and arrange themselves almost randomly even though there seemed to be a little tendency of preference for like neighbors. The total reduced atomic distribution functions of the amorphous Ni_(35)Zr_(65) alloys produced by mechanical alloying and liquid quenching looked alike but some differences were found in their partial functions.
이덕열 고려대학교 공학기술연구소 1984 고려대학교 생산기술연구소 생기연논문집 Vol.19 No.1
Using AgKα radiation (λ=0.5608Å) in transmission, the structure of a melt-spun amorphous Ti_(50)Be_(40)Zr_(10) alloy has been determined. The amorphous alloys, especially the metal-metalloid alloys, are known to possess similar structures, each with a relatively strong first peak in I(K) and a shoulder on the high K-side of a broad second peak. Though not a metal-metalloid alloy, the Ti_(50)Be_(40)Zr_(10) alloy shows such a typical structure as those for metal-metalloid alloys. However, the first peak in I(K) of this alloy, appearing at K₁= 2.754Å^(-1) looks a little more diffuse than those of the metal-metalloid alloys. In addition, the maximum of the shoulder on the second peak in I(K) occurs below 1. The interatomic distance for the first nearest neighbors is estimated from the position r₁ of the first peak in g(r) as 2.920Å. Also the number of the first nearest neighbors, i.e., the coordination number, is estimated from the area under the first peak in the radial distribution function as 15.1.
316L 스테인리스강의 내식성 코팅에 관한 연구 : Ⅰ. Ni-Al 금속막 코팅 Ⅰ. Ni-Al Metallic Coating
이덕열,김남진,황일두,송석권 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.9
316L stainless steel plates, which are usually used for metallic components of molten carbonate fuel cells, were coated with nickel and aluminum successively for the enhancement of their corrosion resistance. Electroplating and pack cementation were employed respectively for nickel and aluminum coating. The corrosion property of the coated specimen was checked by dipping test and anodic polarization test, and compared with those of the bare stainless steel and the one coated only with aluminum. In the case of dipping test the specimen was characterized, before and after the test, using optical microscopy to study the morphology of its cross-section, and X-ray diffraction to identify the phases of the coated layer. Intermetallic compound of Al₃Ni₂ was formed on the surface of the coated specimen and this specimen turned out to be highly resistant to corrosion, even more than the one coated only with aluminum.
이용복,장진성,이덕열,이동희,국일현 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.8
Precipitation behavior of solution heat treated Alloy 690 tubes (60Ni-30Cr-10Fe: UNS N 06690) has been studied. Carbide precipitates along grain boundary were revealed as M_(23)C_6 type carbide having semi-coherent interface with one adjacent grain. Also drastic change of precipitate density was observed on a twin intercepted grain boundary, i.e, abundant precipitates on general grain boundaries, but no precipitate on boundary segments intercepted by twins. This selective precipitation phenomenon was attributed to the different orientation relationships of grain boundary segments, i.e. different misorientation characteristics, and eventually drastically different boundary energy. Different misorientation characteristics of interfaces were investigated through Kikuchi pattern analyses in TEM. The grain boundary with precipitates was random high angle grain boundary and the clean segment of boundary was CSL (Coincidence Site Lattice) special boundary (e.g. ∑=15), judged by Brandon's criterion. Of course coherent twin boundary with ∑=3 were free of precipitate. (Received April 2,1997)