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中文摘要：
在不同强度的强磁场下对定向凝固高温合金DZ417G试样进行固溶处理和时效处理,利用扫描电镜（SEM）和显微硬度计观察析出相γ＇的微观结构并测定其显微硬度,探讨强磁场对析出相γ＇的大小、形态、分布和硬度的影响,并从热力学原理探讨解释析出相γ＇的变化。结果显示：12 T强磁场下固溶处理后,析出相γ＇尺寸减小,枝晶干和枝晶间区域析出相γ＇体积百分数分别增加达5.3%和5.6%,显微硬度分别增加9.4%和15.8%。12 T强磁场下时效处理后,析出相γ＇尺寸减小,枝晶干和枝晶间区域析出相γ＇体积百分数分别增加达3.9%和4.2%,显微硬度分别增加达6.2%和11%。
英文摘要：
Directionally solidified superalloy DZ417G was studied through solution treatment and aging under different longitudinal magnetic field,their microstructures and micro hardness were characterized by scanning electron microscopy（SEM） and micro hardness tester.The influences of high magnetic field on the morphology and micro hardness of γ′ precipitates were discussed.The variation of γ′ precipitates was explained by thermodynamics.The results showed that the size of γ′ precipitation phases reduced,the volume fraction of γ′ precipitation phases in the dendrite core and in the interdendrite area increased to 5.3% and 5.6% through solution treatment under 12 T magnetic fields respectively,which lead to the fact that the micro hardness increased to 9.4% and 15.8% respectively.After aging under 12 T magnetic fields,the volume fraction of γ′ precipitation phases in the dendrite core and in the interdendrite area increased to 3.9% and 4.2% respectively,the micro hardness increased to 6.2% and 11%.
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