【摘要】 利用真空定向凝固法制备Re含量分别为5%、6%和7%的新型四代单晶高温合金，研究Re含量对合金铸态组织、热处理组织及高温拉伸性能的影响。结果表明，随Re含量增加，合金铸态组织的一次枝晶间距和二次枝晶间距增加，共晶组织含量增加，热处理后γ′相尺寸先减小后增大；屈服强度随着拉伸温度升高先下降达到600℃后升高，到达900℃后下降；延伸率随拉伸温度升高先基本保持不变，到达600℃下降，到达760℃后继续升高；随Re含量升高，合金的屈服强度先下降后升高，室温到760℃延伸率下降，900℃至980℃延伸率升高。更多还原

【Abstract】 The new fourth-generation single crystal superalloys with Re content of 5%, 6%, and 7% were prepared using vacuum directional solidification. The effects of Re content on as-cast microstructure, heat treatment microstructure and high temperature tensile properties of the alloys were investigated. The results showed that with the increase of Re content, the primary spacing and secondary dendrite spacing of as-cast microstructure increase,and the eutectic microstructure content increases. After heat treatment, the size of the γ’ phase first decreases and then increases and with the increase of tensile temperature, the yield strength of the alloy first decreases to 600℃and then increases, and then decreases to 900℃. The elongation remains basically unchanged with the increase of tensile temperature, decreases when reaching 600℃ and continues to increase when reaching 760°C. As the Re content increases, the yield strength of the alloy decreases first and then increases. The elongation decreases from room temperature to 760℃, and increases from 900℃ to 980℃.更多还原