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Co기 초합금 ECY768에서 응고 조직 및 탄화물 형성 거동
이정석,김현철,이재현,서성문,조창용,Lee, J.S.,Kim, H.C.,Lee, J.H.,Seo, S.M.,Jo, C.Y. 한국재료학회 2003 한국재료학회지 Vol.13 No.6
Directional solidification experiments were carried out at 0.5-150 $\mu\textrm{m}$/s in the Co-base superalloy ECY 768. As increasing solidification rate, the dendrite length increased and it reached the maximum at 150 $\mu\textrm{m}$/s, where the tip temperature is close to the liquidus. The liquidus and eutectic temperatures could be estimated by comparing the dendrite lengths and the temperature gradients at the solid/liquid interface and those were estimated as $1424.6^{\circ}C$ and $1343^{\circ}C$ respectively. Between the dendrites just below final freezing temperature, MC carbide and $M_{23}$$C_{6}$ carbide were found. It was confirmed that the script or blocky shape was Ta or W-rich MC carbide, and the lamellar shape was Cr-rich eutectic carbide. The solid/liquid interface morphology clearly showed that the Cr-rich eutectic carbide formed just after the script type MC carbide.
Ti-6Al-4V 합금의 가공 열처리조건에 따른 기계적 특성의 변화 (1) : 인장및 파괴거동 Tensile and Fracture Behaviors
최승주,김상식,조용성,장우길,서성문 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.12
Tensile and fracture behaviors of double-forged and aged Ti-6Al-4V alloys, with and without solution heat treatment and/or rapid cooling, were examined in the present study. Depending on the forging temperature and heat treatment condition, the microstructures of Ti-6Al-4V alloys varied greatly, including equiaxed α+transformed β. elongated α+equiaxed α, α' or acicular α in the prior β grain, and significantly affected the tensile and fracture properties at 25 and 316℃. Tensile and fracture failure modes of Ti-6Al-4V alloys with different microstructures were discussed based on the detailed fractographic examinations.