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首页> 外文期刊>Materials Science and Engineering >Investigation on long-term creep rupture properties and microstructure stability of Fe-Ni based alloy Ni-23Cr-7W at 700 ℃
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Investigation on long-term creep rupture properties and microstructure stability of Fe-Ni based alloy Ni-23Cr-7W at 700 ℃

机译:Fe-Ni基合金Ni-23Cr-7W在700℃下的长期蠕变断裂性能和组织稳定性研究

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摘要

Long-term creep rupture properties and microstructural stability of Fe-Ni based alloy Ni-23Cr-7W (HR6W, ASME Code Case 2684) were experimentally investigated. Crept specimens at 700 ℃ for durations up to 37,667 h were chosen, the microstructure evolution during creep was characterized. Besides the MC and M_(23)C_6 carbides found in the as-received sample, the formation of α-W phase, α-Cr phase and Laves phase in crept samples were confirmed with scanning/transmission electron microscopes. Statistical quantitative image analysis was used to evaluate the precipitation behavior and growth kinetics for the main strengthening precipitate, Laves phase. The alloy was proven to have good microstructural stability without observable coarsening of strengthening precipitates during long-term creep up to around 37,667 h. It was also verified that the growth kinetics of Laves phase can be well described by the Johnson-Mehl-Avrami-Kolmogorov equation.
机译:实验研究了Fe-Ni基合金Ni-23Cr-7W(HR6W,ASME案例号2684)的长期蠕变断裂性能和显微组织稳定性。选择在700℃下持续37,667 h的蠕变试样,表征蠕变过程中的微观结构演变。除了在接收到的样品中发现MC和M_(23)C_6碳化物外,还通过扫描/透射电子显微镜确认了蠕变样品中α-W相,α-Cr相和Laves相的形成。统计定量图像分析用于评估主要强化沉淀物Laves相的沉淀行为和生长动力学。事实证明,该合金具有良好的微观结构稳定性,并且在长达37,667 h的长期蠕变过程中没有观察到强化沉淀的粗化现象。还证实了Laves相的生长动力学可以用Johnson-Mehl-Avrami-Kolmogorov方程很好地描述。

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