通过中频感应炉熔炼制备了经济节Ni型铸造双相不锈钢Cr25Mn10Mo4Ni2N,利用OM、XRD、SEM和电化学工作站研究了1000～1150℃温度区间对其显微组织及固溶处理后在人工海水中耐蚀性能的影响.结果表明,固溶温度处于1000 ～1100℃区间时,材料的组织由α、γ及σ相组成.随着固溶温度升高,σ相的形貌由细小岛状向粗大岛状变化,且数量不断减少.当固溶温度升高至1120℃时,σ相完全消失,组织仅由α和γ两相组成.节Ni型双相不锈钢Cr25Mn10Mo4Ni2N经1120固溶时,其腐蚀电流密度最小,电荷转移电阻最大,耐蚀性能最佳;1150℃固溶时,耐蚀性能次之;在1020 ～1100℃温度区间固溶时,随着温度的升高σ相含量减少,材料耐蚀性能越好.
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