발간논문

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Vol.37, No.8, 937 ~ 945, 1999
Title
Microstructural Evolution and Mechanical Behavior of Cast Alloy 718 During Creep - Rupture
오동규Dong Kyu Oh,주동원Dong Won Joo,조창용Chang Yong Jo,서성문Seong Moon Seo,김두현Doo Hyun Kim,최승주Seung Joo Choe,이상래Sang Lae Lee
Abstract
Microstructural evolution and mechanical behavior of cast alloy 718 during creep-rupture were investigated at and above 650℃. It has been found that deformation twin proceeded by the propagation of planar bands at 650℃, 704℃ and 760℃. Cracking was initiated along the interfaces between these twin bands and matrix therefore transgranular fracture observed at the temperature. Creep deformation at and above 704℃ caused precipitation of plate-like δ phase along the band. Precipitation of plate-like δ phase on the band prevented from transgranular crystallographic failure, therefore, intergranular creep failure was observed at and above 816℃. Due to plastic deformation during creep failure at and above 816℃ the δ platelets displayed curved morphology at the failed specimens.
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