利用OM、SEM、XRD、TEM、冲击力学测试和动电位极化研究了3.6 mass％和8.0 mass％两种Mn含量下19 mass％ Cr节Ni型双相不锈钢800℃时效析出相的形成、韧性、耐点蚀性能.结果表明:Mn含量较低时,σ相析出较慢,54 h后呈细小颗粒弥散于铁素体奥氏体相界;由于Mn参与了σ相的形成,Mn含量较高时,σ相析出速度快,54 h后呈层片状覆盖在铁素体上;Mn含量的增加使奥氏体相比例增加,时效初期有助于提高实验钢的冲击性能,但时效后期大量σ相的析出加速了冲击性能的下降;低Mn含量实验钢点蚀电位在时效初期保持350 mV左右,比高Mn含量的电位高出约200 mV,54 h后两者耐点蚀性能均降低.较高的Mn含量在时效初期有助于提高实验钢的再钝化性能,54 h后两者再钝化性能趋于一致.
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