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접종능이 우수하고 페이딩 속도가 느린 구상 흑연 주철용 접종제 개발
권해욱,안종헌,최훈영 嶺南大學校 工業技術硏究所 2003 工業技術硏究所論文集 Vol.31 No.1
The performance of inoculant for ductile cast iron was investigated. The ability and fading rate of inoculant were evaluated through thermal analysis during holding the cast iron melt after the nodularizer and inoculant had been added. The effect of the addition of minor elements was also examined.
티타늄 용탕의 산화칼슘 및 흑연과의 반응 및 기포 결함의 형성에 미치는 압력의 영향
권해욱,배창근 한국주조공학회 2000 한국주조공학회지 Vol.20 No.4
Titanium was melted in the CaO-coated alumina crucible and the reaction between the melt and the coating layer was negligible. The volume fraction of the gas porosity was decreased with increasing pressure and the sound bar castings with no porosity was obtained under the Ar atmosphere of the pressure of 300kN/㎟. The surface of the casting obtained from CaO-coated graphite mold was slightly rougher than that from graphite without coating. The reaction product of titanium melt with the layer of CaO was mainly titanium oxide and that with graphite crucible was titanium cabide with small amount of titanium nitride.
투과전자현미경 투영상의 크기 분포로부터 입자 크기의 공간분포의 결정
권해욱 嶺南大學校 工業技術硏究所 1991 연구보고 Vol.19 No.1
An iterative method to determine the spatial size distribution of particles with simple polyhedral shapes from their projected images using extraction replicas has been developed. This method was applied to the size distributions of rod-shaped AIN particles and indicated that the lognormal distribution function described the spectral size distribution better than it did the distribution function of projected images.
鑄鐵의 熔接 : 1970年代 文獻 小考 A Survey during 1970's
權海旭 嶺南大學校 工業技術硏究所 1985 연구보고 Vol.13 No.1
. This study was initiated as a literature search for the paper on the subject published during 1970's. The difficulties most encountered in the welding of iron castings were identified. The problems included: (1) solidlfication and fusion of the weld and base metals, (2) solid state transformation in the heat affected zone, and (3) weld-metal dilution. Solidification was controlled by using low heat input, inoculations, weld metal composition with carbon equivalent close to eutectic, and by slow cooling rates not higher than 10℃/s. Fusion of the base metal was controlled by buttering and low heat input so that a narrow fusion zone with isolated white iron colonies could be obtainted. A direct relationship between preheating, cooling rate and peak HAZ herdness was established. Low heat input, "Quench-weld" techniques, buttering, and the use of nickel electrodes were found to relieve shrikage stress, thus preventing HAZ cracking. Replacing silicon by aluminum/calcium as inoculants were reported to result in a more weldable iron casting. Controlled addition of niobium, which formed stable carbide in the fusion zone and HAZ, was found to improve the weldability in D2 irons which contained 18-20% nickel. weld-metal dilution could be controlled by buttering and limiting heat input. Post-weld heat treatment was found to be less important amidst the improvements in the state of art of iron casting welding. Yet the weldment could still be benefited by a moderate post-weld heat treatment in improving dimensional stability, ductility, and resistance to stress-corrosion cracking. White iron formed in the weldment were found to decompose faster than white iron formed in the casting process, making it possible to take advantage of a production heat-treatment as a concurrent post-weld heat treatment. The technical and economical feasibility of automated iron casting welding was also discussed and was considered to be eminent due to the introdution of flux- cored electrodes, submerged are welding with specific flux additions, and other improvements in conventional technologies.