SMAT技术制备梯度纳米孪晶结构及其腐蚀行为研究

doi:10.11902/1005.4537.2021.349

中国腐蚀与防护学报

2022, Vol. 42

Issue (6): 973-978 DOI: 10.11902/1005.4537.2021.349

研究报告

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SMAT技术制备梯度纳米孪晶结构及其腐蚀行为研究

陈婷婷¹^,², 武晓雷²^,³, 韩培德¹(

)

1.太原理工大学材料科学与工程学院太原 030024
2.中国科学院力学研究所非线性力学国家重点实验室北京 100190
3.中国科学院大学工程科学学院北京 100049

Gradient Nanotwin Structure Prepared by SMAT Technology on S31254 Super Austenitic Stainless Steel Surface and Its Corrosion Behavior in 10%NaCl Solution

CHEN Tingting¹^,², WU Xiaolei²^,³, HAN Peide¹(

)

1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2. State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
3. School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China

引用本文:

陈婷婷, 武晓雷, 韩培德. SMAT技术制备梯度纳米孪晶结构及其腐蚀行为研究[J]. 中国腐蚀与防护学报, 2022, 42(6): 973-978.
Tingting CHEN, Xiaolei WU, Peide HAN. Gradient Nanotwin Structure Prepared by SMAT Technology on S31254 Super Austenitic Stainless Steel Surface and Its Corrosion Behavior in 10%NaCl Solution[J]. Journal of Chinese Society for Corrosion and protection, 2022, 42(6): 973-978.

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摘要:

采用表面机械研磨 (SMAT) 技术在S31254超级奥氏体不锈钢表面制备得到了梯度结构,通过微结构分析及电化学实验方法,对梯度结构进行详细表征并研究其不同层深处的腐蚀行为。结果表明：S31254不锈钢经过SMAT处理后获得了由两侧梯度层和中心粗晶层组成的结构,在梯度层中,纳米尺度变形孪晶的密度在厚度方向上呈梯度分布。逐层进行的电化学实验表明,在距样品表面80 μm处耐蚀性最好,原因是较高的孪晶密度和较光滑的表面提高了耐蚀性能。

关键词 ：超级奥氏体不锈钢, 表面机械研磨, 梯度结构, 纳米孪晶, 电化学腐蚀

Abstract：

A kind of gradient structure on the surface of S31254 super austenitic stainless steel was prepared by surface mechanical attrition treatment (SMAT) technology. The gradient structure was characterized by microstructural analysis and electrochemical test, while the variation of corrosion characteristics along the depth of the gradient structure was also studied in 10%NaCl solution. The results show that after SMAT treatment, the surface of S31254 steel emerged a structure composed of two gradient layers, while a coarse-grained layer inserted in between the two layers. In the gradient layer, the density of the nanoscale deformation twins shows a gradient distribution along the depth direction. Through mechanically thinning the gradient structure layer by layer and followed by electrochemical detection in the NaCl solution, it is revealed that nearby the location at depth of 80 μm exhibits the best corrosion resistance, which may be ascribed to that the prepared surface was smoother with higher twin density.

Key words： super austenitic stainless steel surface mechanical attrition treatment (SMAT) gradient structure nanotwin electrochemical corrosion

收稿日期: 2021-12-04

ZTFLH:

TG174

基金资助:国家自然科学基金(51871159);国家自然科学基金(11972350);国家自然科学基金(11890680)

作者简介: 陈婷婷,女,1996年生,硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2021.349 或 https://www.jcscp.org/CN/Y2022/V42/I6/973

图1 CG样品和GS样品横截面的微结构

图2 GS样品横截面的微结构

图3 GS样品的TEM图像

图4 GS样品横截面的显微维氏硬度分布

图5 GS样品的不同层在10%NaCl溶液中的动电位极化曲线

图6 GS样品的不同层在10%NaCl溶液中的电化学阻抗谱

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