研究了铌含量对直接时效态(DA)和标准热处理态(STD) GH4169合金室温拉伸性能、650℃拉伸性能以及650℃、690 MPa持久性能的影响规律,并进行了显微组织观察和热力学计算分析.结果表明,随着铌的含量从5.2％(质量分数,下同)提高到5.4％,DA态合金强化相的质量分数提高,室温和650℃下强度明显提高,但铌含量达到5.6％后强度有所下降;STD态合金在同一固溶温度下,铌含量的提高会增加δ相的质量分数,但对强化相质量分数的影响不及DA态明显,强度随铌含量提高而增高的幅度不大.DA态合金的持久寿命随铌含量的增加而增长,超过5.6％后基本保持不变;STD态合金持久寿命在铌含量升高到5.6％后明显下降,这可能是由δ相数量及形貌的改变引起的.
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