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Ni-Fe-Co 합금의 고온 변형 공정 변수와 미세조직 및 열물리적 특성의 상관 관계
이광석(K.S. Lee),정중은(J.E. Jung),장영원(Y.W. Chang),이정환(J.H. Lee) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
High temperature deformation behavior of a Ni30Fe53Co17 alloy was investigated by conducting a series of compression tests. After constructing empirical process map, the appropriate working temperature-strain rate combination for optimum forming was deduced to be~1423 K, 10<SUP>-2</SUP> s<SUP>-1</SUP> region having relatively high power dissipation efficiency greater than 0.36. Furthermore, open die forging for the 100 mm diameter billets was performed to confirm the variation of thermo-physical properties in relation to microstructure. The coefficient of thermal expansion was found to increase considerably with increasing the open die forging temperature and decreasing the cooling rate, which in turn provides a drastic increase of average grain size.
저열팽창 Ni<SUB>x</SUB>Fe<SUB>100-x</SUB> (x=36, 40, 44) 합금의 고온 변형 거동
윤동현(D. H. Yoon),이광석(K. S. Lee),정중은(J. E. Jung),장영원(Y.W. Chang),이정환(J.H. Lee) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.10
In this study, high temperature deformation behavior of low thermal expansion coefficient NixFe100-x (x=36, 40, 44) alloys was investigated at temperature ranging from 600 to 1200 ℃ at the strain rates between 10<SUP>-4</SUP> and 10<SUP>0</SUP> /s by conducting a series of compression tests. Both the temperature and strain rate dependence of the flow stress can be described via the hyperbolic sine function together with microstructural characterization. Based on the results, the empirical deformation map was also constructed, from which the contour conformed to high power dissipation efficiency could be exhibited as the feasible processing combination for each alloy.