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首页> 外文期刊>Coatings >The Microstructure and Mechanical and Corrosion Behaviors of Thermally Aged Z3CN20-09M Cast Stainless Steel for Primary Coolant Pipes of Nuclear Power Plants
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The Microstructure and Mechanical and Corrosion Behaviors of Thermally Aged Z3CN20-09M Cast Stainless Steel for Primary Coolant Pipes of Nuclear Power Plants

机译：核电站初级冷却剂管铸造不锈钢铸造不锈钢的微观结构和机械和腐蚀行为

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The effects of thermal aging time at 400 °C on the microstructure and mechanical and corrosion behaviors of Z3CN20.09M cast stainless steel were investigated; and the corresponding thermal aging mechanism was studied. It was revealed that the changes in mechanical properties after thermal aging were mainly caused by the iron-rich phase (α) and the chromium-rich phase (α’) produced by the amplitude-modulation decomposition of ferrite. A similar trend of thermoelectric potential during thermal aging was determined in relation to the Charpy impact energy. However, the corrosion resistance of Z3CN20.09M cast stainless steel deteriorates as thermal aging time increases. When the thermal aging is longer than 3000 h, the precipitation of G phase has a great influence on the corrosion resistance. The interfacial matching relationship between G phase and the surrounding ferrite was established by selected area electron diffraction of HRTEM. The relationship is of cube-on-cube phase boundary type. The impact fracture mechanisms in relation to thermal aging time were also studied and compared.
机译：研究了热老化时间在400°C上对Z3CN20.09M铸造不锈钢的微观结构和机械和腐蚀行为的影响;并研究了相应的热老化机理。据透露，热老化后的机械性能变化主要由铁素体的振幅调节分解产生的铁相（α）和富含铬的相（α'）引起。相对于夏比冲击能量确定热老化期间热电电位的类似趋势。然而，Z3CN20.09M铸造不锈钢的耐腐蚀性随着热老化时间的增加而劣化。当热老化长于3000小时时，G相的沉淀对耐腐蚀性有很大影响。通过HRTEM的选定区域电子衍射建立了G相和周围铁氧体之间的界面匹配关系。这种关系是多维数据集相位边界类型。还研究了与热老化时间有关的冲击骨折机制。

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