Effect of Short Term Aging on Microstructure Evolution, Pitting and Intergranular Corrosion Behaviour of UNS31254

Yipeng Liu; Ning Zhong; YangTing Sun; Yiming Jiang

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Effect of Short Term Aging on Microstructure Evolution, Pitting and Intergranular Corrosion Behaviour of UNS31254

机译：短期时效对UNS31254组织演变，点蚀和晶间腐蚀行为的影响

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Here the intergranular and pitting corrosion resistance of super austenitic stainless steel TypeUNS31254 was investigated, whose performance declined obviously after aging at 900 C for shortterms. Test methods including the nitric acid immersion test and the potentiostatic pulse technique(PPT) were applied respectively, and the results showed that the samples were highly sensitive to thosetwo types of localized corrosion after aging within 180 minutes. Then the segregation between theinterior and boundaries of grains eased while the general corrosion became dominated. Thetransmission electron microscope (TEM) further revealed molybdenum-rich Laves-related phasesformed along the boundaries for only 10 minutes and they were the main culprit for the degradation.Finally, to offer guidance for the process of UNS31254, the welding joints were also checked and theevaluation method of pitting corrosion was discussed.

机译：在此，研究了UNS31254型超级奥氏体不锈钢的耐晶间腐蚀和点蚀腐蚀性能，其性能在900°C短期老化后性能明显下降。分别采用硝酸浸泡试验和恒电位脉冲技术（PPT）等测试方法，结果表明，样品在180分钟内老化后对这两种类型的局部腐蚀高度敏感。然后，晶粒的内部和边界之间的偏析得到缓解，而一般腐蚀开始占主导地位。透射电子显微镜（TEM）进一步揭示了沿边界仅10分钟形成的富钼Laves相关相，它们是降解的罪魁祸首。最后，为指导UNS31254的生产工艺，还检查了焊接接头并讨论了点蚀的评价方法。

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《International Journal of Electrochemical Science》 |2016年第5期|共13页
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Yipeng Liu; Ning Zhong; YangTing Sun; Yiming Jiang;
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Effect of Short Term Aging on Microstructure Evolution, Pitting and Intergranular Corrosion Behaviour of UNS31254

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