含<strong>3%Cu</strong>低碳马氏体不锈钢<strong>0Cr13Ni4Mo</strong>的显微组织及耐腐蚀性能

doi:10.11900/0412.1961.2022.00541

金属学报

2024, Vol. 60

Issue (12): 1656-1666 DOI: 10.11900/0412.1961.2022.00541

研究论文

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含3%Cu低碳马氏体不锈钢0Cr13Ni4Mo的显微组织及耐腐蚀性能

杨彬彬¹^,², 宋元元¹(

), 郝龙¹, 姜海昌¹, 戎利建¹

1 中国科学院金属研究所中国科学院核用材料与安全评价重点实验室沈阳 110016
2 太原科技大学材料科学与工程学院太原 030024

Microstructure and Corrosion Resistance of Low-Carbon Martensitic Stainless Steel 0Cr13Ni4Mo with 3%Cu Addition

YANG Binbin¹^,², SONG Yuanyuan¹(

), HAO Long¹, JIANG Haichang¹, RONG Lijian¹

1 CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China

引用本文:

杨彬彬, 宋元元, 郝龙, 姜海昌, 戎利建. 含3%Cu低碳马氏体不锈钢0Cr13Ni4Mo的显微组织及耐腐蚀性能[J]. 金属学报, 2024, 60(12): 1656-1666.
Binbin YANG, Yuanyuan SONG, Long HAO, Haichang JIANG, Lijian RONG. Microstructure and Corrosion Resistance of Low-Carbon Martensitic Stainless Steel 0Cr13Ni4Mo with 3%Cu Addition[J]. Acta Metall Sin, 2024, 60(12): 1656-1666.

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摘要:

Cu元素合金化可以提高低碳马氏体不锈钢的力学性能，但其对该材料耐腐蚀性能的影响尚没有一致的认识。本工作采用SEM、XRD、TEM、APT以及电化学测试等手段研究了添加3%Cu (3Cu)对低碳马氏体不锈钢0Cr13Ni4Mo显微组织及耐腐蚀性能的影响，并与不含Cu不锈钢进行了对比分析。结果表明，经过1050℃固溶处理后，Cu均匀地分布在板条马氏体基体上；400℃回火后，Cu形成了极小的纳米团簇，其中偏聚了大量的Fe原子等；500℃回火后，Cu纳米团簇长大为尺寸为5~10 nm的富Cu析出相，核心处主要偏聚Cu原子，且与基体处于共格关系，而碳化物则由富Fe的纳米团簇生长成富Cr的析出相。3Cu低碳马氏体不锈钢经过500℃回火后表现出优异的耐腐蚀性能，这是因为富Cu析出相的长大过程中伴随着向周边基体排出Cr原子，减少了由富Cr碳化物造成的贫Cr区，从而降低了3Cu低碳马氏体不锈钢的腐蚀敏感性。

关键词 ： 0Cr13Ni4Mo, 富Cu析出相, 耐腐蚀性能, 原子探针层析技术

Abstract：

Low-carbon martensitic stainless steel 0Cr13Ni4Mo is widely used in hydraulic turbine runners, oil and gas storage, high-pressure pipes in power generation, and other fields owing to its high strength, good corrosion resistance, and good welding properties. However, to enhance its performance under different environments, there is a need to improve its strength and corrosion resistance. Previous studies have found that adding Cu to 0Cr13Ni4Mo steel enhances its strength through the formation of Cu-rich precipitation. However, the impact of Cu on the corrosion behavior of the 0Cr13Ni4Mo steel is not yet well understood. This study aims to investigate the effect of adding 3%Cu (mass fraction) on the microstructure and corrosion resistance of low-carbon martensitic stainless steel 0Cr13Ni4Mo using various techniques such as SEM, XRD, TEM, APT, and electrochemical testing. The results show that after solution treatment at 1050^oC, Cu is uniformly distributed on the lath martensite matrix. After tempering at 400^oC, Cu forms minute nanoclusters with a large number of Fe atoms segregated. On the other hand, tempering at 500^oC leads to the growth of Cu-rich precipitates with a size of 5-10 nm, where Cu atoms are mainly segregated at the core of the precipitates and are in a coherent relationship with the martensitic matrix. Carbides grow from Fe-rich nanoclusters to Cr-rich precipitates during the tempering process. The addition of 3%Cu to low-carbon martensitic stainless steel shows excellent corrosion resistance after tempering at 500^oC. This may be due to the emission of Cr atoms to the surrounding matrix during the growth of Cu-rich precipitates, which reduces the Cr-depleted zone caused by Cr-rich carbides in the matrix, thus reducing the corrosion sensitivity of 0Cr13Ni4Mo martensitic stainless steel with 3%Cu addition. These findings provide a better understanding of the role of Cu-rich precipitates on the corrosion performance of low-carbon martensitic stainless steels and provide guidance for the design of corrosion resistant steels.

Key words： 0Cr13Ni4Mo Cu-rich precipitation corrosion resistance atomic probe tomography

收稿日期: 2022-10-24

ZTFLH:

TG142

基金资助:吉林省与中国科学院科技合作高新技术产业化专项项目(2024SYHZ0004);辽宁省自然科学基金项目(2020-MS-08)

通讯作者: 宋元元，songyuanyuan@imr.ac.cn，主要从事金属材料微观组织结构研究

Corresponding author: SONG Yuanyuan, assistant professor, Tel: (024)23971976, E-mail: songyuanyuan@imr.ac.cn

作者简介: 杨彬彬，男，1998年生，博士生

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表1 2种低碳马氏体不锈钢的化学成分 (mass fraction / %)

图1 不同热处理工艺下0Cu钢和3Cu钢基体组织的SEM像

图2 0Cu钢和3Cu钢经不同热处理后的XRD谱

图3 3Cu不锈钢经过500℃回火2 h后的TEM分析

图4 不同热处理工艺下0Cu钢和3Cu钢在3.5%NaCl溶液中的动电位极化曲线

表2 不同热处理工艺下0Cu钢和3Cu钢在3.5%NaCl溶液中的动电位极化曲线特征值

图5 不同热处理工艺下0Cu钢和3Cu钢在3.5%NaCl溶液中的EIS

图6 不同热处理工艺下0Cu钢和3Cu钢在3.5%NaCl溶液中的等效电路图

表3 不同热处理工艺下0Cu钢和3Cu钢在3.5%NaCl溶液中EIS的等效电路拟合参数

图7 3Cu钢经过1050℃固溶2 h后Fe、Cr、Ni、Mn、Mo、C和Cu原子的三维空间分布图及Cu原子最近邻分布曲线

图8 3Cu钢经过400℃保温2 h回火后Fe、Cr、Ni、Mn、Mo、C和Cu原子的三维空间分布图，1.3%C和4%Cu原子的等浓度面分布图以及相应团簇的成分分布

图9 3Cu钢经过500℃保温2 h回火后Fe、Cr、Ni、Mn、Mo、C和Cu原子的三维空间分布图，3%C原子和15%Cu原子的等浓度面分布图以及相应团簇的成分分布

图10 经500℃回火处理后0Cu钢与3Cu钢的腐蚀机制示意图

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