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首页> 外文期刊>Journal of Materials Engineering and Performance >Influence of Sigma-Phase Formation on the Localized Corrosion Behavior of a Duplex Stainless Steel
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Influence of Sigma-Phase Formation on the Localized Corrosion Behavior of a Duplex Stainless Steel

机译：Sigma相形成对双面不锈钢局部腐蚀行为的影响

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摘要

Because of their austenitic-ferritic microstructures, duplex stainless steels offer a good combination of mechanical and corrosion resistance properties. However, heat treatments can lower the mechanical strength of these stainless steels as well as render them susceptible to intergranular corrosion (IGC) and pitting corrosion. In this study, a low-carbon (0.02 percent) duplex stainless steel is subjected to various heat treatments at 450 to 959 deg C for 30 nain to 10 h. The heat-treated samples then undergo ASTM IGC and pitting corrosion tests, and the results are correlated with the microstructures obtained after each heat treatment. In the absence of Cr_(23)C_6 precipitation, ff-phase precipitates render this duplex stainless steel susceptible to IGC and pitting corrosion. Even submicroscopic sigma-phase precipitates are deleterious for IGC resistance. Longer-duration heat treatments (at 75ft to 850 deg C) induce chromium diffusion to replenish the chromium-depleted regions around the sigma-phase precipitates and improve IGC resistance; pitting resistance, however, is not fully restored. Various mechanisms of sigma-phase formation are discussed to show that regions adjacent to sigma-phase are depleted of chromium and molybdenum. The effect of chemical composition (pitting resistance equivalent) on the pitting resistance of various stainless steels Is also noted.
机译：由于它们的奥氏体 - 铁素体微结构，双相不锈钢钢提供机械和耐腐蚀性的良好组合。然而，热处理可以降低这些不锈钢的机械强度，并使其易于骨间腐蚀（IGC）和蚀腐蚀。在该研究中，低碳（0.02％）双链不锈钢在450至959℃下进行各种热处理30℃至10小时。然后经过热处理的样品进行ASTM IGC和点蚀腐蚀试验，结果与每个热处理后获得的微观结构相关。在没有Cr_（23）的C_6沉淀的情况下，FF相沉淀使得这种双相不锈钢易受IGC和蚀腐蚀的影响。甚至亚微米σ相沉淀物对于IGC抗性有害。更长持续时间的热处理（在75英尺至850℃）诱导铬扩散以补充Sigma相沉淀物周围的铬耗尽区域并提高IGC抗性;然而，蚀性抗性未完全恢复。讨论了各种σ相形成的机制，表明邻近Sigma相的区域耗尽了铬和钼。还注意到化学成分（蚀抗性等同物）对各种不锈钢的蚀性电阻的影响。

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