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Effect of Ti Content on Creep Properties of Ni-Base Single Crystal Superalloys
최백규,김인수,홍현욱,도정현,정중은,조창용 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.5
The effect of Ti content on the creep properties and microstructures of experimental Ni-base single crystal superalloyshas been investigated. The experimental alloys were designed to provide better high temperature propertiesthan the commercial single crystal alloy CMSX-4. The creep properties of the experimental alloys, Alloy 2 andAlloy 3, were superior to those of CMSX-4. Alloy 3 showed a longer creep life than Alloy 2 at 900 °C and 950 °C,while it has similar creep life with Alloy 2 at 982 °C. Transmission electron microscopy micrographs of the experimentalalloys after the creep test showed distinct deformation features as a function of temperature and Ti content. The dissociation of dislocations into partial dislocations with stacking faults in Alloy 3 was found to improve resistanceto creep deformation at 950 °C. The effect of Ti on the creep deformation mechanism was not evident at 982 °C,which resulted in similar creep properties in both experimental alloys. The transition of the γ′ cutting mechanismfrom dislocations coupled with stacking faults to anti-phase boundary coupled pairs occurred both in Alloy 2 andAlloy 3. However, the transition temperature was higher in Alloy 3 than in Alloy 2 because of the difference in Ticontents.
IN738LC 합금의 열간 노출 및 재생 열처리에 따른 미세조직과 응력 파단 특성의 변화
최백규,주동원,김인수,장중철,조창용,Choe, Baek-Gyu,Ju, Dong-Won,Kim, In-Su,Jang, Jung-Cheol,Jo, Chang-Yong 한국재료학회 2001 한국재료학회지 Vol.11 No.10
Effects of thermal exposure and rejuvenation treatment on the microstructural evolution and the stress-rupture properties of IN738LC have been investigated. The role of precipitates on the stress- rupture properties has been analyzed through microstructural observations. Thermal exposure at $982^{\circ}C$ for 1000 hours gave rise to precipitation of $\sigma$ phase and coarsening of ${\gamma}$'. The microstructural degradation with thermal exposure at $982^{\circ}C$ deteriorated stress rupture properties of the alloy. All the existing phases except MC carbides have completely dissolved into the matrix with homogenization treatment at $1200^{\circ}C$ for 2 hours. Microstructure and stress-rupture properties of the thermal exposed specimens have been successfully rejuvenated by the proposed treatment.
IN738LC 합금의 열간 노출 및 재생 열처리에 따른 미세조직과 응력 파단 특성의 변화
최백규,주동원,김인수,장중철,조창용,Choe, Baek-Gyu,Ju, Dong-Won,Kim, In-Su,Jang, Jung-Cheol,Jo, Chang-Yong 한국재료학회 2001 한국재료학회지 Vol.11 No.11
Effects of thermal exposure and rejuvenation treatment on the microstructural evolution and the stress-rupture properties of IN738LC have been investigated. The role of precipitates on the stress-rupture properties has been analyzed through microstructural observations. Thermal exposure at $982^{\circ}C$ for 1000 hours gave rise to precipitation of $\sigma$ phase and coarsening of r'. The microstructural degradation with thermal exposure at $982^{\circ}C$ deteriorated stress rupture properties of the alloy. All the existing phases except MC carbides have completely dissolved into the matrix with homogenization treatment at $1200^{\circ}C$ for 2 hours. Microstructure and stress-rupture properties of the thermal exposed specimens have been successfully rejuvenated by the proposed treatment.