形变强化和逆相变细晶强化对<strong>Fe-18Cr-8Ni</strong>钢耐腐蚀性能的影响

doi:10.11902/1005.4537.2023.093

中国腐蚀与防护学报

2024, Vol. 44

Issue (2): 429-436 CSTR: 32134.14.1005.4537.2023.093 DOI: 10.11902/1005.4537.2023.093

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形变强化和逆相变细晶强化对Fe-18Cr-8Ni钢耐腐蚀性能的影响

王智慧¹, 吴雷¹, 姜懿珊²(

), 张弦¹, 万响亮¹, 李光强¹, 吴开明¹^,³

^1.武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室武汉 430081
^2.武汉科技大学绿色制造工程研究院武汉 430081
^3.武汉科技大学高性能钢铁材料及其应用省部共建协同创新中心武汉 430081

Effect of Deformation Strengthening and Phase Reversion Grain Refinement Strengthening on Corrosion Resistance of Fe-18Cr-8Ni Steel

WANG Zhihui¹, WU Lei¹, JIANG Yishan²(

), ZHANG Xian¹, WAN Xiangliang¹, LI Guangqiang¹, WU Kaiming¹^,³

^1.Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
^2.Academy of Green Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
^3.Collaborative Innovation Center for Advanced Steels, Wuhan University of Science and Technology, Wuhan 430081, China

引用本文:

王智慧, 吴雷, 姜懿珊, 张弦, 万响亮, 李光强, 吴开明. 形变强化和逆相变细晶强化对Fe-18Cr-8Ni钢耐腐蚀性能的影响[J]. 中国腐蚀与防护学报, 2024, 44(2): 429-436.
Zhihui WANG, Lei WU, Yishan JIANG, Xian ZHANG, Xiangliang WAN, Guangqiang LI, Kaiming WU. Effect of Deformation Strengthening and Phase Reversion Grain Refinement Strengthening on Corrosion Resistance of Fe-18Cr-8Ni Steel[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(2): 429-436.

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摘要:

利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、电子背散射衍射(EBSD)和电化学工作站等对奥氏体不锈钢的微观组织及电化学腐蚀行为进行了分析。结果表明，形变强化和逆相变细晶强化提高了奥氏体不锈钢在3.5%NaCl溶液中的耐点蚀性能，晶粒细化导致晶界密度的增加，提高了Cr在晶界中的扩散速率，从而提高钝化膜的稳定性与致密性。经过敏化处理后形变强化和逆相变细晶强化提高了奥氏体不锈钢的耐晶间腐蚀能力。碳化铬析出物周围形成的贫铬区降低了耐晶间腐蚀性能，而在超细晶/细晶组织中Cr的快速扩散促进了贫铬区的快速愈合，提高了耐晶间腐蚀性能。

关键词 ：奥氏体不锈钢, 形变强化, 细晶强化, 晶间腐蚀

Abstract：

Cold rolling and reverse phase transformation are the main methods to enhance the yield strength of austenitic stainless steel. Therefore, the effect of deformation strengthening and grain refinement strengthening on the microstructure and corrosion behavior of Fe-18Cr-8Ni austenitic stainless steel was characterized by SEM, TEM, EBSD, electrochemical workstation and other technical characterization means. The results show that the deformation strengthening and the inverse phase transformation induced grain refinement strengthening could enhance the pitting resistance of austenitic stainless steel in 3.5%NaCl solution, grain refinement led to an increase in grain boundary density, which promote the diffusion rate of Cr at grain boundaries, thereby improving the stability and compactness of the passivation film. After sensitization treatment, deformation strengthening and inverse phase transformation induced grain refinement strengthening could enhance the intergranular corrosion resistance of austenitic stainless steel. The appearance of Cr-depletion zone around chromium carbide precipitates will deteriorate the intergranular corrosion resistance of the steel, while the rapid diffusion of Cr in ultrafine grain/fine grain structure will promoted the rapid healing of the passivation film on the Cr-depletion zone, thus the intergranular corrosion resistance of the steel may be improved.

Key words： austenitic stainless steel deformation strengthening fine grained strengthening intergranular corrosion

收稿日期: 2023-03-27 32134.14.1005.4537.2023.093

ZTFLH:

TG174

基金资助:国家自然科学基金(U20A20277);广西科技重大专项(AA22068080)

通讯作者: 姜懿珊，E-mail：jiangyishan@wust.edu.cn，研究方向为金属腐蚀与防护

Corresponding author: JIANG Yishan, E-mail: jiangyishan@wust.edu.cn

作者简介: 王智慧，女，1997年生，博士生

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图1 3种钢试样的显微组织形貌

图2 3种钢试样的TEM形貌

图3 3种钢试样的EBSD图和晶粒尺寸分布图

图4 3种钢试样在3.5%NaCl溶液中的动电位极化曲线

表1 3种钢试样在3.5%NaCl溶液中的点蚀电位、腐蚀电位和腐蚀电流密度

图5 3种钢试样经敏化处理后的SEM显微组织

图6 3种钢试样在饱和CuSO4溶液中的动电位极化曲线和再活化曲线

表2 3种钢试样晶粒尺寸和耐腐蚀性能

图7 3种钢试样的点蚀电位-晶粒尺寸曲线和再活化率-晶粒尺寸曲线

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