低温扩散预处理对含<strong>B</strong>超级奥氏体不锈钢<strong>S31254</strong>析出相及耐蚀性的影响

doi:10.11902/1005.4537.2025.073

中国腐蚀与防护学报

2025, Vol. 45

Issue (6): 1773-1778 CSTR: 32134.14.1005.4537.2025.073 DOI: 10.11902/1005.4537.2025.073

研究报告

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低温扩散预处理对含B超级奥氏体不锈钢S31254析出相及耐蚀性的影响

何燕¹^,²(

), 刘燕¹^,², 田华¹^,², 陈晔¹^,²

1 中国机械总院集团山西机电研究院有限公司太原 030009
2 山西省机械产品质量监督检验站有限公司太原 030009

Effect of Low Temperature Diffusion Pretreatment on Precipitation of Phases During Post-aging Treatment for B-containing S31254 Super Austenitic Stainless Steel and its Corrosion Resistance

HE Yan¹^,²(

), LIU Yan¹^,², TIAN Hua¹^,², CHEN Ye¹^,²

1 China Academy of Machinery Shanxi Electromechanical Research Institute Co. Ltd. , Taiyuan 030009, China
2 Shanxi Machinery Products Quality Supervision and Inspection Station Co. Ltd. , Taiyuan 030009, China

引用本文:

何燕, 刘燕, 田华, 陈晔. 低温扩散预处理对含B超级奥氏体不锈钢S31254析出相及耐蚀性的影响[J]. 中国腐蚀与防护学报, 2025, 45(6): 1773-1778.
Yan HE, Yan LIU, Hua TIAN, Ye CHEN. Effect of Low Temperature Diffusion Pretreatment on Precipitation of Phases During Post-aging Treatment for B-containing S31254 Super Austenitic Stainless Steel and its Corrosion Resistance[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(6): 1773-1778.

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摘要:

研究了低温扩散预处理对含B超级奥氏体不锈钢S31254钢高温时效过程中晶界析出相及耐蚀性的影响。结果表明，含B超级奥氏体不锈钢经过低温300 ℃不同时间扩散处理，可改变B在晶界的分布，低温扩散时间越长，对后续高温时效处理中析出相的析出影响越明显，其中300 ℃保温60 min的试样抑制高温时效析出相析出明显。B参与了晶界析出相的析出，含B富Mo析出相相界面具有更好的耐蚀性能。经过300 ℃不同时间扩散处理后，S31254钢高温时效组织中析出相明显减少。

关键词 ：超级奥氏体不锈钢, 析出相, 时效处理, 耐蚀性, 扩散处理

Abstract：

In this paper, hot rolled plate of a B-containing super austenitic stainless steel S31254 was subjected to solid solution treatment at 1180 ^oC for 20 min, and then diffusion pre-treatment at 300 ^oC for different times, and finally aging 900 ^oC for 2 h. Meanwhile the influence on the precipitation of second phases during aging process and the corrosion performance in 10% NaCl solution of the aged steel was assessed. The results show that when the steel is subjected to pre-diffusion treatment at 300 ^oC for different times, it will affect the redistribution of B at grain boundaries after subsequent high-temperature aging treatment. The longer the low temperature diffusion time, the more significant the impact on the formation and distribution of the precipitation phase. Among others, the steel being pre-diffusion treated at 300 ^oC for 60 min may present the most significant inhibition effect on the precipitation of second phases. B is involved in the precipitation of the precipitated phase at grain boundaries, the B-containing Mo-rich precipitate phase interface has better corrosion resistance. After diffusion treatment at 300 ^oC for different times, the precipitates of were significantly reduced in the aging microstructure of S31254 steel.

Key words： super austenitic stainless steel precipitate phase aging treatment corrosion resistance diffusion pretreatment

收稿日期: 2025-02-28 32134.14.1005.4537.2025.073

ZTFLH:

TG174

通讯作者: 何燕，E-mail：heyan2012@163.com，研究方向为金属材料

作者简介: 何燕，女，1988年生，工程师

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https://www.jcscp.org/CN/10.11902/1005.4537.2025.073 或 https://www.jcscp.org/CN/Y2025/V45/I6/1773

图1 热处理工艺流程

图2 S31254钢在300 ℃保温不同时间后在900 ℃时效处理2 h的显微组织

图3 S31254钢在300 ℃保温不同时间后在900 ℃时效处理2 h后的EDS能谱分析

图4 B在奥氏体钢中的溶解度曲线

图5 S31254钢经300 ℃保温处理不同时间后再经900 ℃时效处理2 h，在10%NaCl水溶液中的动电位极化曲线

图6 经300 ℃保温处理不同时间、再经900 ℃时效处理2 h后S31254钢的动电位再活化曲线

表1 图6中S31254钢动电位再活化曲线Ir与Ra拟合值

图7 经300 ℃保温处理不同时间后再经900 ℃时效处理2 h的S31254钢电化学极化腐蚀表面形貌

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