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0.05wt%C-1.8wt%Mn 강에서 비금속 개재물과 미세조직의 변화에 미치는 Ti 함량의 영향
이상윤,오영주 대진대학교 첨단소재연구소 2000 첨단소재연구소논문집 Vol.3 No.-
The formation of non-metallic inclusions and microstructures in various titanium contents in low carbon steels have been studied. The increase in titanium contents leads to no variation in fraction of intra granular ferrite because the fine TiNs do not affect the volume fraction of total inclusions, although high titanium steel have lots of fine TiN.
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鐵炭化物의 Ostwald ripening에 관한 定量組織學的 分析
李相允,成章鉉,崔鎭源 동아대학교 공과대학 부설 한국자원개발연구소 1986 硏究報告 Vol.10 No.1
The spheroidization of cementite in binary Fe-C alloy, 0.63wt. pct. C. was investigated over a range of temperatures, 650℃, 680℃, and 710℃ for times up to about 1.3×10^(6) sec. Quantitative metallographic techniques were used to obtain the following microstructural data of the cementite particles : the mean size and shape of precipitated partices, size destribution and the number of particles per unit volume. The variation of these microstructural parameters was analyzed in terms of shape factors concerned with various precipitation positions. The results concerning the Ostwald ripening characteristics of iron carbide obtained from the experiment are summerized as follows : 1) The value of activation energy obtained from the graph for the relation between the number iron carbide particles per unit volume and spheroidizing time is calculated to be 44.1 ㎉ / mole and the the coarsening of iron carbide particles occurs by the interdiffusion mechanism of iron and carbon atoms. 2) Mean particle radius measuments have shown that the slope of straight lines obtained from the mean radius-sphroidizing time graph is obtained be to 1 /3.4301, which falls in the range from 1 /3 to 1 / 4, resulting in the combined coarsening mechanism of volume diffusion and grain boundary diffusion through the ferrite matrix 3) Particle size distribution curves have not reached the steady state owing to the diffusion controlled mechanism up to the times of about 1.3×10^(6)sec. and have shown more widely dispersed shapes than the steady state distribution curve due probably to the encounter effect of iron of iron carbide particles precipitated along grain boundaries.
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이상윤,라병욱,박동수,황인헌,이덕동,신영남,박성배,이동욱,박용석,박형근,손상호,권태근,채경락,정경득 慶北大學校 自然科學大學 1986 自然科學論文集 Vol.4 No.-
An Ac-type Plasma Display Panel (PDP) operating with Ne-Ar(0.1%) Penning mixture gas is fabicated. The characterics of the panel with electrodes covered with thin and thick dielectric layers are studied. The brightness of the Neon-orange light emitted by the panel measured as function of applied voltage and frequency. As an application, a graphic display system equipped with PDP showing still and moving pictures is made.
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