本文用示差热分析和金相分析相配合的方法,研究了添加Zr的铸造镍基高温合金中Ni_5Zr相的溶解和转变。Ni_5Zr的存在显著地降低合金的初熔温度并诱发(γ+γ′)共晶的溶解。在850℃以上高温热暴露时Ni_5Zr发生如下转变: Ni_5Zr+γ(C)—→ZrC+γ 试验结果证明示差热分析技术在高温合金相变研究中是一种有用的工具。
Studies were made of the solution and transformation of intermetallic compound Ni_5Zr in Zr-bearing cast Ni-base superalloy and of effect of the Zr addition on the microstructure by DTA together with metallographic observation. The occurrence of Ni_5Zr in the superalloy may markedly decrease the incipient melting temperature and induce the solution of γ+γ′eutectic. Under high temperature exposure above 850℃, Ni_5Zr with γ (C) is transformed into ZrC and γ, which is bound to be reflected in DTA.
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