Inhibition of the second phase precipitation and improvement of intergranular corrosion resistance by boron segregation at the grain boundary of S31254 superaustenitic stainless steel

Corrosion Communications Pub Date : 2024-04-01 DOI:10.1016/j.corcom.2023.08.006

Jian Wang , Zhiqiang Liu , Haiyu Tian , Peide Han , Yaiza Gonzalez-Garcia

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Abstract

The inhibition of Mo segregation and phase precipitation is vital for improving the hot workability and corrosion resistance of superaustentic stainless steels (SASS). The boron non-equilibrium segregation of S31254 SASS was implemented through solid solution, air cooling, and diffusion at low-temperature treatment (SADT). The precipitation process and intergranular corrosion (IGC) of S31254 SASS with various boron distributions were researched at a sensitive temperature. The second phases were observed and identified by SEM and TEM. IGC susceptibility was evaluated by double-loop potentiodynamic reactivation (DL-EPR) measurements. The SADT treatment promoted more segregation of B at the grain boundary, leading to lower amounts of grain boundary precipitation before aging for 6 h. The decrease of σ phases in B-regulated samples enhances the IGC resistance, compared with the samples without B addition specimens.

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通过在 S31254 超奥氏体不锈钢晶界处偏析硼来抑制第二相析出并提高晶间耐腐蚀性能

抑制钼偏析和相析出对提高超奥氏体不锈钢（SASS）的热加工性能和耐腐蚀性至关重要。通过固溶、空冷和低温扩散处理（SADT）实现了 S31254 SASS 的硼非平衡偏析。在敏感温度下研究了不同硼分布的 S31254 SASS 的析出过程和晶间腐蚀（IGC）。通过 SEM 和 TEM 观察和识别了第二相。通过双环电位动力再活化（DL-EPR）测量评估了 IGC 的敏感性。与未添加硼的试样相比，添加硼的试样中 σ 相的减少增强了抗 IGC 性。

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来源期刊

Corrosion Communications

CiteScore

7.30

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0.00%

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