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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.
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.
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.
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.
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.