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강일구,Gang, Il-Gu 한국과학기술단체총연합회 1996 과학과 기술 Vol.29 No.1
산학협동연구는 장기적이고 독자적이어야 하는데 지난동안 우리는 극히 단기적인 제품기술이나 생산기술에서의 산학협동에 주력해 왔다. 비교적 과학기술 도입이 늦었던 일본도 이미 1백년 이상의 기반조성이 이루어진 바탕위에서 산학협동이 이루어진 것을 볼때 우리나라도 지속적인 연구개발의 기반 구축이 절대적으로 필요한 것이다. 이 글은 과총주최로 구랍 7일 한국과학기술회관 국제회의장에서 열린 '95 산학협동워크숍에서 강일구씨가 발표한 내용이다.
Fe-Ni 계 인바합금의 열팽창거동에 미치는 Mn, Cr, Co 의 첨가 효과
강일구,김희중,이종현,김학신,안행근 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.7
The change of thermal expansion behavior by addition of Mn, Cr and Co within 5 wt% has been investigated to Fe-36% Ni Invar alloy. The amount of thermal expansion for the addition of Mn is larger than that far the addition of Cr. In the case of Co addition, thermal expansion decreases up to 4% Co but increases at 5% Co. The increase in the thermal expansion coefficient(α) per 1 wt% is 1.1×10^(-6) and 0.55×10^(-6) for the addition of Mn and Cr, respectively, in the temperature range of 30 to 100˚C. On the other hand the decrease in α for the addition of Co per 1 wt% up to 4% Co is 0.12×10^(-6) and then increases remarkably thereafter. The change of α with the kind and the amount of additives is discussed using some magnetic parameters. α decreases with increasing the ratio of specific magnetization to Curie temperature. In the range of the electron concentration(e/a) below 8.7, α for Mn or Cr added alloys increases with decreasing e/a but for Co added alloys the inverse tendency is shown.
Fe-C 계의 α/γ상평형에 필요한 열역학적 파라미터의 계산
강일구,임상호 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.8
Parameters needed in model calculations of the α/γ phase equilibrium in Fe-C alloys are calculated by using new Monte Carlo procedures. The parameters include the carbon-carbon interaction energies and standard carbon potentials in the αand γ phases and the relative lattice stability of pure bcc and fcc Fe. Accurate values of the model parameters are determined by a comprehensive analysis of the existing experimental carbon activity data in both the αand γ phases and by utilizing the Fe-C phase diagram. The parameters determined in the present work together with the new Monte Carlo procedures will surely provide more confidence in the low temperature extrapolation of the metastable α/γ phase equilibrium.
소량의 Mn 첨가가 Fe-36.5% Ni 인바합금의 열적변형 및 기계적 성질에 미치는 영향
강일구,김희중,이종현,김학신 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.1
Behaviors of the thermal expansion, high temperature deformation and mechanical properties after vacuum annealing have been studied in Fe-36.5% Ni-(0.2∼0.6)% Mn Invar alloys. Regardless of the difference of Mn content, the thermal expansion coefficients are not changed and those at room temperature are below 10^(-6). The yield stress and the ultimate compressive stress at 1000℃ are not changed with Mn content while the peak strain continuously increases with Mn content. The yield stress at room temperature after annealing is slightly decreased with Mn content, and the lowest yield stress of 205. 8㎫ is obtained an alloy containing 0.48% Mn by annealing at 1200℃. At annealing of 1200℃ the yield stress and the ultimate tensile stress as well as the elongation show the lowest values and these are discussed as the combined effects of the grain growth, the amount of MnS and the development of cube texture.