本文研究了高Ti含量高温合金中的一次η相的析出、溶解及其控制。结果表明,一次η相的析出与Ti,Al等元素的含量和合金的凝固结晶速率有密切的关系.它呈大块集中分布时,会显著地降低合金的拉伸强度、塑性和持久寿命.在铸态合金中,一次η相(平均直径20μm)溶解的温度-时间关系符合: T=1370-86.11gt合理地控制Ti,Al含量和冶炼工艺可防上一次η相的生成.采用较大的热变形和均匀化处理,可避免一次η相的不利影响。
The precipitation and dissolution together with their control of the primary η-phase in the high-Ti Ni-Fe-Cr based superalloy have been investigated. The precipitation of primary η-phase is found to be related closely to Ti or Al content and solidificaion rate of the alloy. Collection of block η-phase may remarkably reduce the tensile strength, ductility and rupture life of the alloy. The temperature-time relation of dissolution of the primary η-phase obeys T=1370-86.1 lg t for as-cast superalloy.The formation of primary η-phase may be prevented by reasonable control of Ti or Al content and smelting process. The adoption of treatment under hot deformation and homogenization may be the remedy for unfavourable influence of η-phase.
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