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김정두(J.D.Kim),노일환(I.H.Noh),성석현(S.H.Sung),김원묵(W.M.Kim),오승철(S.C.Oh),이달호(D.H.Lee),권기문(K.M.Kwan),전영학(Y.H.Jeon),김흥기(H.K.Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Recently, emerging as major tasks are grobal warming prevention, and earth environment conservation and preservation, and the resolution of environmental issues is crucial in the 21st century and needs to jointly be tackled by all nations in cooperation with each other. this research developed dry cols air grinding system, and this ensured cold effects of machine tools and dressing effects against loading phenomenon of grinding wheel, thus extending the tool life of grinding wheel.
급냉응고/분말야금법으로 제조한 Al-Fe-V-Si-Ti-W 합금의 고온크립거동
김인수,김낙준,남수우,위당문,오승철,최상우 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.11
The elevated temperature creep properties and microstructural stability of RS/PM Al-10Fe-1.3V-2Si-1Ti-1W(wt.%) alloy have been investigated. The alloy showed high stress exponent of 12 to 18 and activation energy of 237 to 808 kJ/㏖, which was strongly dependent on the temperature and stress. The unusual creep behavior of the dispersion strengthened alloys cannot be described satisfactorily by current creep laws, Recently, Ro¨sler and Arzt proposed a new model assuming thermally activated dislocation detachment from dispersoids exerting an attractive force. In the present study, experimental evidence was achieved for the presence of attractive interaction between the dislocation and the dispersoids using TEM observations. The creep behavior of the alloy was analyzed using the model proposed by Ro¨sler and Arzt, and the experimental data were consistent with the prediction based on the model. It has been confirmed that the high temperature deformation of the alloy was dominated by the dislocation creep at the temperature range of 400 to 480℃, but the diffusional creep at the interface between powders also contributed to the deformation above 430℃.