| Summary: | 碩士 === 國立屏東科技大學 === 機械工程系所 === 105 === The microstructure of present alloy is essential austenite phase with high density dislocation and/or along {111} plane. The UTS, YS and elongation of as-rolled plate is 188.8ksi, 179.2ksi and 16.88%, respectively. After being heated at 1050~1150℃, the recovery and recrystallization are finishing in 1~4 minutes. Prolonged heating time, grain growth is observed. The relationship between grain size and time is D=43.805×t^0.11±10.31(μm). The UTS, YS and elongation of as-rolled plate are in range of 143.0~111.5ksi, 86.7~78.1ksi and 41.6~57.7%, respectively. And, σYS=76.63+46.81D^-1/2. Meanwhile, the activity energy is Q=305.01(kcal/mol). When heated at 500~600℃, the time of the recovery and recrystallization is in range of 30~120 minutes, and the temperature of recrystallization being in range of 550~575℃。Additionally, some κ’-phase carbides observed within matrix and/or on grain boundaries resulting to be not significant of grain growth.
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