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首页> 外文期刊>ISIJ international >Selection of the Massive-like δ-γ Transformation due to Nucleation of Metastable δ Phase in Fe-18 Mass%Cr-Ni Alloys with Ni Contents of 8, 11, 14 and 20 Mass%
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Selection of the Massive-like δ-γ Transformation due to Nucleation of Metastable δ Phase in Fe-18 Mass%Cr-Ni Alloys with Ni Contents of 8, 11, 14 and 20 Mass%

机译：Ni形成的Fe-18质量％Cr-Ni合金中亚稳δ相的成核作用，选择质量大的δ-γ相变8、11、14和20质量％的含量

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摘要

It has been realized that a massive-like transformation, in which δ phase (ferrite) transformed to γ phase (austenite) in the solid state during and after solidification, was selected in Fe–C steels. X-ray radiography confirmed that the massive-like transformation also occurred in Fe-18 mass%Cr-Ni alloys with Ni contents of 8, 11, 14 and 20 mass%Ni. According to the equilibrium phase diagram, δ phase is the primary phase in 8 and 11 mass%Ni alloys while γ phase in 14 and 20 mass%Ni alloys. Solidification was always initiated by nucleation of δ phase and consequently fine γ grains were formed by the massive-like transformation in 8 and 11 mass%Ni. On the other hand, nucleation of δ phase as a metastable phase was preferably selected at lower undercoolings (<50 K) in 14 and 20 mass%Ni and consequently the massive-like transformation occurred even in 14 and 20 mass%Ni alloys. Solidification of γ phase can be triggered by nucleation of δ phase followed by the massive-like transformation in the Fe–Cr–Ni with lower Cr/Ni values (the primary γ alloys). Moreover, the present study demonstrates that the massive-like transformation will be commonly observed in Fe-based alloys, in which δ and γ phases are competitive each other from a thermodynamic perspective.
机译：已经认识到，在Fe–C钢中选择了块状相变，其中在凝固过程中和凝固后，δ相（铁素体）从固态转变为γ相（奥氏体）。 X射线射线照相证实，在Ni含量为8、11、14和20质量％Ni的Fe-18质量％Cr-Ni合金中也发生块状转变。根据平衡相图，在8和11质量％的Ni合金中，δ相是主要相，而在14和20质量％的Ni合金中，γ相是主要相。总是通过δ相的形核来引发凝固，因此通过在质量百分比为8和11的镍中进行块状相变而形成细小的γ晶粒。另一方面，优选在较低的过冷度（＜50K）下在14质量％和20质量％的Ni中选择作为亚稳相的δ相的成核，因此即使在14质量％和20质量％的Ni中也发生块状相变。合金。 γ相的凝固可以由δ相的成核触发，然后在具有较低Cr / Ni值的Fe-Cr-Ni中发生块状转变（主要的γ合金）。此外，本研究表明，在铁基合金中通常会观察到块状相变，其中从热力学观点来看，δi和γi相具有竞争性。

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