| Title |
Pesearch Paper / Mechanical Behavior : Effects of High Temperature Deformation and Thermal Exposure on Precipitation Behavior of cast Alloy 718 |
| Authors |
오동규(Dong Kyu Oh),주동원(Dong Won Joo),조창용(Chang Yong Jo),김두현(Doo Hyun Kim),최승주(Seung Joo Choe),이상래(Sang Lae Lee) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Abstract |
Precipitation behavior of cast alloy 718 during thermal exposure and creep-rupture test was investigated. Coarsening of γ` and γ$quot; was accelerated with raising exposure temperature, but transformation from γ$quot; to δ was dominant at and above 816℃. The applied stress assisted in transformation from γ$quot; to δeven below γ$quot; solvus. The transformation nucleated at the stacking fault in γ$quot; phase. δ phase usually existed in the interdendritic region or at grainboundary in the as-cast condition. Generally δ had plate or needle-like morphology in the as-cast or heat treated conditions, however, the stress induced δ dispalyed curved morphology across dendrite. |