【摘要】 研究了强磁场下时效热处理对定向凝固高温合金DZ417G组织和硬度的影响。结果表明,较常规不同时间的时效处理,强磁场能够促进相变的发生,使析出相细小而弥散分布。与无磁场相比,经16h的时效处理后,6 T的强磁场使枝晶干处强化相γ′细化,尺寸小12%左右,显微硬度提高约8.4%;枝晶间处强化相γ′没有发生粗化,共晶组织周围的强化相γ′较无磁场下分布均匀;对碳化物的形貌没有产生明显影响。更多还原

【Abstract】 The influence of high-magnetic-field ageing treatment on the microstructures and hardness of the directionally solidified superalloy DZ417 G was investigated. The results indicate that the high magnetic field induces the strengthened phases γ′ to become fine and distribute more dispersed. The 6T magnetic field decreases γ′ phase in the dendrite core by 12% and increased the microhardness by 8.4% after 16 h ageing treatment. Compared with that of no magnetic field, the γ′ phase in the interdendrite does not coarsen and the γ′ phase around the eutectic distribute more homogeneously. The carbide morphology does not change by the magnetic field.更多还原