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Fe-30%Ni-0.25%C합금의 기계적 성질에 미치는 Ausforming처리 및 Marforming처리의 영향
朴豊玉,李圭福,金學信 全北大學校 1993 論文集 Vol.36 No.-
The effect of ausforming treatment and marforming treatment on the mechanical properties of Fe-30%Ni-0.25%C alloy was investigated. The results obtained in this paper are as follows ; 1) The strength of ausformed martensite was mainly increased because of work-hardening inherited from deformed austenite. The better ductility of ausformed martensite was due to ductile matrix formation of retained austenite and absense of transformed twin and high dislocation density. 2) The strength of marformed martensite was increased by the increment of dislocation density, crossing of transformed twin with deformed twin and the mutual crossing of deformed twin. 3) The ductility of marformed martensite was lower than that of ausformed martensite but the strength of marformed martensite was higher. From this result, marforming treatment is much better than ausforming treatment for the improvement of mechanical properties in Fe-30Ni-0.25%C alloy.
소결법을 이용한 Si_3N_4, ZrO_2(PSZ)/SUS계 경사기능재료의 제조에 관한 연구
尹正模,朴豊玉,奇俊舒 全北大學校 1996 論文集 Vol.42 No.-
Generally, main problem of heterogeneous materials, composed with metal/ceramics, is wide difference of thermal expansion that exists in layers between metal and ceramics. So new materials are developing, so called FGM(Functionally Gradient Materials), that has relaxation of thermal stress and thermal barrier effect.
Disc 적층법에 의한 ZrO_2/Ni계 경사기능재료의 제조에 관한 연구
尹正模,高仁用,朴豊玉 全北大學校 1996 論文集 Vol.42 No.-
Doctor blade is the method for getting the FGM by the steps of making slurry and stacking, drying, de-greasing, pressing sintering method after adding binder, deflocculant, plasticizer as the additives and ethyl alcohol as the solvent to the powder material. In this experiment, a study on the development of manufacture of FGM, we tried to magnify the size of FGM on the basis of spray stacking method, sintering method and powder stacking method.