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최답천,황금연 ( Dap Chun Choi,Keum Yeon Hwang ) 한국주조공학회 1992 한국주조공학회지 Vol.12 No.2
The effects of B additions, alone or in combination with Si, on the microstructure, DO₃⇔B2 transition temperature(Tc) and corrosion behavior of Fe-25at%Al alloys were investigated. The raw materials were arc-melted in vacuum and then subjected to the following heat treatments to maximize the DO₃order : homogenized at 1000℃ for 48hrs, slowly cooled to 500℃, and held at that temperature for 24hours. Results showed that the B addition to Fe-25at%Al alloys does indeed refine the grain and change from intergranular to transgranular fracture mode at room temperature, indicating a strengthening of grain boundaries. The Fe-25at% Al-1at% B-3at% Si alloy showed the highest Tc(△Tc=150℃) in this work. However, the effectiveness of Si in raising Tc decreased with more than 5at% Si additions combined with B. Since the preferential corrosion occurs at the precipitates, the corrosion resistance decreased due to the increased amount of precipitates with alloying additions.
최답천,황금연,강창석,명태호,Mishima, Yoshinao 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.11
A new class of Co-base superalloy may be developed based on the ternary Co-Al-C system in which two phase alloys could be designed containing E2₁-type intermetallic compound Co₃AlC_x, known as κ-phase, being dispersed in the Co primary solid solution. Strength and ductility of the two phase alloys are evaluated at room to elevated temperatures. It is found that compressive 0.2% flow stress of the two phase alloys at room temperature seems to exhibit a maximum with 30 to 50% volume fraction of the intermetallic phase. Room temperature ductility of the two phase alloys is found to be 5 to 21% varying monotonously with increasing volume fraction of the intermetallic phase. At 1000℃, the 0.2% flow stress of the two phase alloys with κ-phase for more than 30% in volume are about 250 to 280 ㎫ under a strain rate of 1.4 ×10^(-4)s^(-1), which is comparable to that of commercial nickel base superalloy.