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首页> 外文期刊>Journal of Materials Research >Grain boundary filmlike Fe-Mo-Cr phase in nitrogen-added type 316L stainless steels
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Grain boundary filmlike Fe-Mo-Cr phase in nitrogen-added type 316L stainless steels

机译：氮添加型316L不锈钢中的晶界膜状Fe-Mo-Cr相

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摘要

The precipitates in nitrogen-added type 3l6L stainless steels (SS) were investigated by transmission electron microscopy (TEM) after thermal aging. Besides carbides (M23C6 and M6C) and intermetallic phases, an unknown phase of an Fe-Mo-Cr(-Si) system in a filmlike morphology precipitated at grain boundaries. In spite of the similarity in its chemical composition to that of the Laves phase, the phase of the Fe-Mo-Cr(-Si) system exhibited five-, three-, and twofold symmetries, which are generally observed in quasicrystals having icosahedral symmetry. This phase was formed from the intergrowth of small crystalline clusters of the Laves phase, Decreasing the nitrogen content to that of commercial type 316L grade suppressed the formation of the filmlike fivefold phase. This was attributed to the dissipation of small Laves clusters by M23C6 carbides, which increased as a result of the decreased nitrogen content.
机译：热老化后，通过透射电子显微镜（TEM）研究了添加氮的3l6L不锈钢（SS）中的沉淀。除碳化物（M23C6和M6C）和金属间相外，Fe-Mo-Cr（-Si）系统的未知相以薄膜状形态沉淀在晶界处。尽管其化学成分与拉夫斯相相似，但Fe-Mo-Cr（-Si）体系的相却表现出五，三和两倍的对称性，通常在具有二十面体对称性的准晶体中观察到。该相是由拉夫斯相的小晶体簇的共生形成的，将氮含量降低到商业类型的316L级可抑制膜状五重相的形成。这归因于M23C6碳化物消散了小的Laves团簇，这是由于氮含量降低而增加的结果。

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