Formation of eutectic (γ′ + α) and α transformation in Ta-bearing high W content cast Ni-base superalloys
Formation of eutectic (γ′ + α) and α transformation in Ta-bearing high W content cast Ni-base superalloys
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DOI：
10.1016/j.scriptamat.2005.06.021
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发表时间：
2005-10
影响因子：
6
通讯作者：
Liangfu Zheng
中科院分区：
文献类型：
--
作者：
Liangfu Zheng
研究了含Ta高W含量铸造镍基高温合金的铸态和热处理试样的显微组织和持久性能。结果表明，Ta促进了凝固后期共晶（γ′+α）的形成。α相在高于1260°C的加热和在1100°C的长期暴露期间是不稳定的，并且可以转变为M6C碳化物。为避免α相的形成，应遵循Ta等原子比替代Al的原则，对合金成分进行调整。
The microstructures of as-cast and heat treated specimens and stress rupture properties for Ta-bearing high W content cast Ni-base superalloys were investigated. The results indicate that Ta promotes the formation of eutectic (γ′+α) in late solidification. The α phase is unstable during heating above 1260°C and long term exposure at 1100°C, and can transform to M6C carbides. To avoid the α phase formation, it is necessary to modify the compositions of alloys by following the principle of substitution of Ta for Al at equal atomic ratio.