Abstract Two types of austenite morphologies, equiaxed and Widmanstatten, were produced through different phase transformation routes to evaluate the critical factors affecting the intergranular corrosion susceptibility in a 2205 duplex stainless steel. These distinct austenite morphologies behaved quite differently in secondary phase precipitation on exposure to sensitization temperature. Although the Widmanstatten microstructure was found to have a larger degree of coherent ferrite/austenite interface area compared with the equiaxed one, it showed a higher degree of sensitization. It was clarified that, in addition to the ferrite/austenite interface coherency, the extent of an interface area and presence of un-stable ferrite also play prominent roles in intergranular corrosion susceptibility.

中文翻译：

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相变途径对2205双相不锈钢晶间腐蚀敏感性的作用

摘要 为了评价2205双相不锈钢晶间腐蚀敏感性的关键因素，通过不同的相变途径产生了等轴相和Widmanstatten两种奥氏体形貌。这些不同的奥氏体形态在暴露于敏化温度下的第二相沉淀中表现得非常不同。尽管发现 Widmanstatten 显微组织与等轴显微组织相比具有更大程度的相干铁素体/奥氏体界面区域，但它显示出更高程度的敏化。明确指出，除了铁素体/奥氏体界面相干性外，界面区域的范围和不稳定铁素体的存在也对晶间腐蚀敏感性起着重要作用。