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Cu-Zn-Al 합금에서 열 및 응력에 의한 마르텐사이트의 미세조직과 결정구조에 관한 연구
朴景采,鄭潾相,金圓柱 慶北大學校 1984 論文集 Vol.38 No.-
In order to investigate the mechanism of shape memory effect mantensitic transformation in a Cu-Zn-Al alloy has been studied on focusing the determination of phase change and the crystal structure by means of tensile test, electron and X-ray diffraction. The mantersite(β_Ⅰ') formed by quenching below the Ms temperature has been transformed in self-accommodating manner on tension and cyclic heating-cooling. As a strain increases, residual parent phase(β) coexisted with mantensite after quenching disappeared and martensite grew(β_Ⅱ') and double transformed (β_Ⅱ'-α_Ⅰ'). The crystal structure of parent phase was bcc and that of β_Ⅰ' martensite was identified as a monoclinic slightly modified from the normal 9R type orthorhombic one and that of α_Ⅰ' martensite was 3R on tension respectively, and the structure of thermally formed pi' martensite is identical that of stress induced martensite β_Ⅱ' on tension.
Cu-Zn-Al 합금에 있어서 응력에 의한 martensite 변태와 의탄성
朴景采,鄭潾相,金鍾澈 慶北大學校 1982 論文集 Vol.34 No.-
Stress-induced martensitic transformations in Cu-Zn-Al polycrystalline have been studied as a function of temperature, using tensile tests and optical microscope observation. As a result, a phase diagram relating various martensite and matrix has been determined in temperature and stress coordinates. Complicated stress-strain curves which change with temperature have been explained in consistent terms by using the phase diagram. It is proposed that mechanism of transformation between martensites is the successive nucleation of regularly spaced partial dislocations.
朴景采,鄭潾相 경북대학교 공과대학 1983 工大硏究誌 Vol.12 No.-
Stress induced martensite transformation in Cu-28w/oZn-5w/oAl polycrystalline have been studied by means of tensile test, optical and scanning electron microscopy and x-ray diffraction at various temperature. As a result, a phase diagram relating various martensite and matrix have been determined in temperature and stress coordinates. Microscopic examinations show that cross structure consist of two B1'martensite variants. It is proposed that mechanism of transformation between martensites is the successive nucleation of regularly partial dislocation.
朴景采 충남대학교 공업교육연구소 1980 論文集 Vol.3 No.2
An investigation was carried out on the effects of microstructure on the strength and toughness of low carbon steel. Heat-treatments were carried out at (750, 780 and 810℃) which is in the two phase (α+γphase) region [Heat treatment A〕and five-cyclic heat treatments were carried out〔Heat-treatment B〕The result showed that strength, hardness, and toughness of heat-treatment B, are greater than those of heat treatment A. Heat-treatment A developed a ferrite network structure along the martensitic boundary. Heat-treatment B developed a martensite network along the ferrite boundary. without developing a coarse ferrite structure in low carbom s teel containing a duplex ferritic martensitic microstructure. A martensitic network structure results in an increase of the strength and toughness compared to a ferrite network form.
朴景采 충남대학교 공업교육연구소 1978 論文集 Vol.1 No.1
Grain growth mechanism formed during the annealing of pure Cadmium, Cd-0.01 at. %Ag a d Cd-0.0lat.% Hg at 240℃∼300℃were studied from the standpoint of grain form (tetrakaidecahedrom). The results obtained as follows: (1) The values of diffusion coefficient in grain growth were 4.41×10^-6∼4.56×10^-5㎠/sec. (2) The grain boundary motion is controlled by grain boundary diffusion of solute atomss from the boundary, and the vales of activation energy were 4.25∼5.86Kcal/mole.
朴景采,金鍾悟,李承遠 충남대학교 공업교육연구소 1981 論文集 Vol.4 No.1
The now model curriculum of the Department of Metallurgical Engineering Education is presented as a proposal to improve education in the College of Industrial Education. In this study the curricula of technical high schools and related Colleges inside and outside country were analized. In addition to above comparative study, various opinions were reflected by collecting interviews and questionnaires from the college professors, technical high school teachers, and the engineers in the fields. Major findings and conclusions are as follow ; 1) The ratio in curriculum structure between theoretical subject and laboratory hours is arranged at about 1.5 for effective metallurgical engineering education. 2) The number of class-hours allocated to the general and fundamental engineering courses is almost same as that of major subjects. 3) Metallurgical engineering education is recommended to have two courses, namely, chemical and physical metallurgy in the new model curriculum.