时效处理对马氏体时效硬化不锈钢显微组织和局部腐蚀性能的影响

doi:10.11902/1005.4537.2023.365

中国腐蚀与防护学报

2024, Vol. 44

Issue (5): 1285-1294 CSTR: 32134.14.1005.4537.2023.365 DOI: 10.11902/1005.4537.2023.365

研究报告

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时效处理对马氏体时效硬化不锈钢显微组织和局部腐蚀性能的影响

洪孝木¹, 王永强¹(

), 李娜², 田凯¹, 杜娟¹

1 安徽工业大学材料科学与工程学院马鞍山 243002
2 安徽工业大学冶金工程学院马鞍山 243002

Effect of Aging on Microstructures and Localized Corrosion of Custom455 Martensitic Age-hardening Stainless Steel

HONG Xiaomu¹, WANG Yongqiang¹(

), LI Na², TIAN Kai¹, DU Juan¹

1 School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan 243002, China
2 School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan 243002, China

引用本文:

洪孝木, 王永强, 李娜, 田凯, 杜娟. 时效处理对马氏体时效硬化不锈钢显微组织和局部腐蚀性能的影响[J]. 中国腐蚀与防护学报, 2024, 44(5): 1285-1294.
Xiaomu HONG, Yongqiang WANG, Na LI, Kai TIAN, Juan DU. Effect of Aging on Microstructures and Localized Corrosion of Custom455 Martensitic Age-hardening Stainless Steel[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(5): 1285-1294.

全文: PDF(15043 KB) HTML

摘要:

利用OM、XRD、TEM、电化学等方法研究了时效处理对Custom455马氏体时效硬化不锈钢显微组织和抗点蚀性能的影响。结果表明，经过时效处理后试样的基体组织为板条马氏体和逆转变奥氏体，并有富铜相、Ni₃Ti等第二相粒子析出。当时效时间一定、时效温度在400~550℃时，逆转变奥氏体的含量随时效温度的上升而上升，因此试样的抗点蚀性能上升；时效温度升至600℃时，试样中大量析出的第二相粒子导致试样抗点蚀性能降低。在时效温度不变时，时效时间由1 h延长至3 h，由于逆转变奥氏体含量变化不明显，且析出相的数量增多、尺寸变大，导致试样抗点蚀性能下降。

关键词 ：马氏体时效不锈钢, 时效处理, 点蚀, 逆转变奥氏体, 富铜析出相

Abstract：

The effect of aging treatment at 400-500^oC for different times on the microstructure and pitting resistance of Custom455 martensitic age-hardening stainless steel was investigated using OM, XRD, TEM and electrochemical methods. The results show that the microstructure of the ageing-treated steels consists of lath martensite and reversed austenite, and with the change of aging temperature and time, the second phase particles such as Cu-rich phases and Ni₃Ti with varying amount and size will be precipitated. For a given aging time, while the aging temperature increased, the amount of reversed austenite will also gradually increase, however the amount and size of Ni₃Ti, ε-Cu and other second-phase particles will not change obviously, so that the pitting corrosion resistance of the steel increased; when the aging temperature rises to 600^oC, a large number of the second-phase particles of Ni₃Ti, ε-Cu and others precipitate out, which leads to a decrease in the pitting corrosion resistance of the steel. When the aging temperature is consistent while the aging time rises to 3 h, the amount of reversed austenite in the steel does not change significantly, but the amount and size of Ni₃Ti, ε-Cu and other second-phase particles change significantly with the increasing aging time, which also leads to a decrease in the pitting corrosion resistance of the steel.

Key words： Martensitic aging stainless steel aging treatment pitting reversed austenite copper-rich precipitation phase

收稿日期: 2023-11-20 32134.14.1005.4537.2023.365

ZTFLH:

TG142.1

基金资助:国家自然科学基金(52171059, 51971003)

通讯作者: 王永强，E-mail: yqwang@ahut.edu.cn，研究方向为金属材料的腐蚀与防护

Corresponding author: WANG Yongqiang, E-mail: yqwang@ahut.edu.cn

作者简介: 洪孝木，男，1997年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2023.365 或 https://www.jcscp.org/CN/Y2024/V44/I5/1285

图1 Custom455不锈钢相图计算结果

图2 经不同条件热处理的Custom455钢金相组织

图3 经不同温度时效处理的Custom455钢的XRD谱

图4 经不同温度时效处理的Custom455钢中逆转变奥氏体含量

图5 不同参数时效处理后Custom455钢的TEM像

表1 经600℃/3 h时效处理试样不同位置(见图5f中标记点)EDS分析结果 (mass fraction / %)

图6 不同时效处理后试样的TEM像

图7 经500℃/3 h时效处理后试样的析出相

图8 不同温度时效处理1和3 h试样的极化曲线

图9 不同温度时效处理后试样的极化曲线

图10 不同温度时效处理1和3 h试样点蚀电位的变化

图11 电化学阻抗拟合的等效电路图

图12 试样经过不同温度时效处理后的Nyquist图

图13 经不同温度时效处理1和3 h试样的Nyquist图

图14 经不同温度时效处理1和3 h试样的Bode图

表2 Custom455不锈钢时效处理1 h在3.5%NaCl溶液中的EIS拟合参数值

表3 Custom455不锈钢时效处理3 h在3.5%NaCl溶液中的EIS拟合参数值

图15 试样的点蚀形貌

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