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고에너지 전자빔투사방법에 의해 제조된 TiB2 표면합금화 재료의 미세조직 연구
신기삼,어광준,이성학 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.5
The present study is concerned with the processing and the microstructural analysis of surface alloyed materials with TiB₂ powders using irradiation of high-energy electron beam. The mixtures of TiB₂ powders and flux were deposited on a plain carbon steel plate, and then electron beam was irradiated on these mixtures using an electron beam accelerator. The microstructures of the irradiated surface layers were examined by optical and scanning electron microscopy. A few residual micropores were found in the sample processed without flux, but their number was decreased in the samples processed with a considerable amount of flux. As a result of irradiation, the Ti content was homogeneously maintained throughout the melted region, whose hardness was greatly improved. This was associated mainly with the microstructural modification including the segregation of Ti and B along solidification cell boundaries and the formation of fine Ti(C,M) particles.
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$2XXX Al-SiC_w$ 복합재료의 분말야금 제조와 기계적 성질 향상 연구
신기삼 한국분말야금학회 1995 한국분말야금학회지 Vol.2 No.3
The purpose of this study is to establish powder metallurgy (P/M) fabrication processes for high performance 2XXX Al composites reinforced with SiC whiskers. Rapidly solidified 2XXX Al powders produced by commercial atomization technique were mixed with SiC whiskers. The results of mixing processes indicated that fluidized zone mixing technique was considerably effective for the large scale production of the mixture of Al powders and whiskers. In order to consolidate these $Al-SiC_w$ mixtures into $Al-SiC_w$ composite billets, a vacuum hot press was set up, and hot processing variables were investigated. Using the hot pressing temperature of $620^{\circ}C$ under the pressure of 50 MPa, good quality $Al-SiC_w$ composite billets having relatively homogeneous microstructure and sound Al/sic interfacial bonding were obtained. Composite billets were then extruded to bars having relatively homogeneous microstructures at the extrusion temperature of 450~500$^{\circ}C$ under the extrusion pressure of 700~ 1000 MPa. Mechanical properties of the extruded bars were found to be comparable with those of the composite processed by Advanced Composite Materials Corp. To improve mechanical properties of the composites, elimination of coarse intermetallic compounds, uniform distribution of reinforcements, and minimization of whisker breakage are suggested.
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Cavity Formation Mechanism in Inert-Gas-Atomized Superalloy A-286
Shin, Keesam 국립7개대학공동논문집간행위원회 2001 공업기술연구 Vol.1 No.-
Cavity formation mechanism is that of great interest for the possibility of utilizing the cavities as a material strengthening elements and also for the application of the knowledge obtained to suppress the cavity formation upon radiation damage. In this study, the cavity formation mechanism is studied in the inert-gas-atomized superalloy A-286. The powders produced by IGA are rapidly solidified by the rapid heat extraction during atomization. This study focuses the effect solute atoms on the cavity formation.
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급냉응고 처리된 초내열 합금 A-286 의 기계적 성질 및 강화기구
이성학,신기삼,Kelly, Thomas F,Flinn, John E 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.3
Mechanical test data of superalloy A-286 show that there is a significant increase in tensile strength after rapid solidification processing (RSP). The mechanism of mechanical property improvement upon RSP was studied by TEM quantitative defect analysis and the data analysis using strengthening models. The most prominent microstructural alterations by RSP are found in the precipitates and in the grain growth behavior. On average, the precipitates in RSP samples are smaller, have higher volume fractions, and are much more stable than their conventionally processed counterparts. The increased tensile strength of the RSP samples is found to be the result of the increased volume fraction and number density of second phase particles. However, the strengthening came mostly through grain growth inhibition by the second phase particles, which in turn increased the strength via Hall-Petch relationship. This study shows the importance of recrystallization and thus the method of consolidation for effective strengthening.
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