Effect of Solid Solution Treatment on Corrosion Performance of As-cast 2101 Duplex Steel

Abstract

Abstract: The effect of solid solution treatment at 900 ~ 1 190 °C on the corrosion performance of as-cast 2101 duplex steel (/%：0.02C，0.69Si,5.00Mn，0.001 5S，0. 022P，21.42Cr, 1.66Ni，0. 31Mo，0. 48Cu，0. 25N) has been investigated by electrochemical corrosion experiments. EIS impedance spectra, equivalent circuit polarization resistance values, and Tafel curves show that at the saine solid solution temperature, the longer the solid solution time, the better the corrosion resistance of steel. From the electron micrographs of structure morphology and the determination of the [-phase area ratio and grain size in the steel, it is obtained that the [-phase area ratio and the number of y grains per unit area increase early and then decrease with increasing solid solution temperature for 30 min and 2 h, and the structure is the densest at 970 °C , and the structure is denser after 2 h of solid solution than that after 30 min of solid solution. 2101 duplex stainless steel corrosion resistance is better as higher dense of structure and less precipitated nitrides. The optimum solid-solution of the steel is at 970 °C for 2 h.

Key words: 2101 Duplex Stainless Steel, Solution Treatment, Microstructure, Electrochemical Corrosion

摘要： 通过电化腐蚀学实验研究了900～1190℃固溶处理对铸态2101双相钢(/%:0.02C,0.69Si, 5.00Mn, 0.0015S,0.022P,21.42Cr, 1.66Ni, 0.31Mo, 0.48Cu, 0.25N)腐蚀性能的影响。EIS阻抗谱图、等效电路极化电阻值和Tafel曲线均表明，同一固溶温度下，固溶时间越长钢的耐蚀性越好。通过组织形貌电镜图及测定组织中γ相面积比和晶粒度得到，固溶处理30 min和2 h后γ相面积比和单位面积γ晶粒个数随着固溶温度的增加都呈先升高后降低的趋势，在970℃时组织最为细密，固溶2 h后组织比固溶30 min的更为细密。组织致密度高，析出氮化物少，则2101双相不锈钢的耐蚀性好，该钢最佳固溶工艺为970℃和2 h。

关键词: 2101双相不锈钢, 固溶处理, 组织, 电化学腐蚀

Li Xin , Wu Huajie , Liu Yinghui , Liu Wei. Effect of Solid Solution Treatment on Corrosion Performance of As-cast 2101 Duplex Steel[J]. Special Steel, 2022, 43(5): 86-91.

李欣, 吴华杰, 刘颖辉, 刘维. 固溶处理对铸态2101双相钢腐蚀性能的影响[J]. 特殊钢, 2022, 43(5): 86-91.

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