回火温度对EH890海洋工程用钢耐蚀性能的影响

doi:10.13251/j.issn.0254-6051.2022.10.024

金属热处理 ›› 2022, Vol. 47 ›› Issue (10): 147-153.DOI: 10.13251/j.issn.0254-6051.2022.10.024

回火温度对EH890海洋工程用钢耐蚀性能的影响

车马俊^1,2,3, 周生璇¹, 杜晓洁¹, 赵晋斌^2,3, 何宜柱¹, 徐震霖¹

1.安徽工业大学材料科学与工程学院, 安徽马鞍山 243002;
2.南京钢铁股份有限公司, 江苏南京 210035;
3.江苏省高端钢铁材料重点实验室, 江苏南京 210035

收稿日期:2022-04-28 修回日期:2022-08-03 出版日期:2022-10-25 发布日期:2022-12-15
通讯作者: 徐震霖,博士,E-mail: xzl2015@ahut.edu.cn
作者简介:车马俊(1983—),男,高级工程师,博士研究生,主要研究方向为低碳高强钢的研究与开发,E-mail: Che_1983@126.com。
基金资助:
南京钢铁股份有限公司与安徽工业大学重点合作研发项目(IGAB19050011);山西省科技重大专项(20181101016)

Influence of tempering temperature on corrosion resistance of EH890 marine engineering steel

Che Majun^1,2,3, Zhou Shengxuan¹, Du Xiaojie¹, Zhao Jinbin^2,3, He Yizhu¹, Xu Zhenlin¹

1. School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan Anhui 243002, China;
2. Nanjing Iron & Steel Co., Ltd., Nanjing Jiangsu 210035, China;
3. Jiangsu Key Laboratory for Premium Steel Material, Nanjing Jiangsu 210035, China

Received:2022-04-28 Revised:2022-08-03 Online:2022-10-25 Published:2022-12-15

摘要/Abstract

摘要： 为探究回火温度对EH890海洋工程用钢耐蚀性能的影响,采用X射线衍射仪、场发射扫描电镜分析了原始淬火态和不同回火温度下EH890钢的物相及微观组织,通过电化学试验研究了不同热处理状态下的腐蚀行为,并结合显微硬度、位错密度计算分析了回火温度对其腐蚀的影响规律。结果表明,EH890钢原始淬火态组织为板条贝氏体,少量粒状贝氏体及准多边形铁素体和薄膜状残留奥氏体,随着回火温度的提高,贝氏体板条不断粗化,铁素体与残留奥氏体分解转化,回火温度达到350 ℃时,贝氏体边界处开始析出弥散细小的碳化物及第二相。随回火温度的升高,试样钢的耐蚀性能呈现先上升后下降的趋势。一方面,回火处理降低了因淬火产生的高位错密度,减轻试样的腐蚀倾向;另一方面,随着回火温度的升高,弥散第二相不断从基体析出,与基体形成局部电偶作用,破坏钝化膜的完整性,降低钝化膜对基体的保护作用,降低腐蚀抗力。在两种因素的综合作用下,经350 ℃回火试样表面形成了更具保护性的钝化膜,表现出最佳的耐蚀性能。

关键词: 海洋工程用钢, 回火温度, 耐蚀性能, 位错密度

Abstract: In order to investigate the influence of different tempering temperatures on the corrosion resistance of the EH890 marine engineering steel, the phase and microstructure of the steel originally quenched and tempered at different temperatures were analyzed by X-ray diffrotometry and field emission scanning electron microscopy. The corrosion behavior under different heat treatment conditions was studied by electrochemical experiments. The influence of tempering temperature on corrosion was calculated and analyzed in combination with microhardness and dislocation density. The results show that the original quenched microstructure of the EH890 steel consists of lath bainite, and a small amount of granular bainite and quasi-polygon ferrite with thin film retained austenite. With the increase of tempering temperature, the bainite lath is coarsened continuously, and the ferrite and retained austenite are decomposed and transformed. When the tempering temperature reaches 350 ℃, the fine dispersed carbides and the second phase begin to precipitate at the boundary of bainite. With the increase of the tempering temperature, the corrosion resistance of the steel shows a trend of increasing first and then decreasing. On the one hand, tempering can eliminate the high dislocation density caused by quenching and reduce the corrosion tendency of the specimen. On the other hand, with the increase of the tempering temperature, the dispersed second phase continuously precipitates from the matrix and forms local galvanic interaction with the matrix, which destroys the integrity of passivation film and reduces its protective effect on the matrix. Under the combined action of the two factors, a more protective passivation film is formed on the surface of the specimen tempered at 350 ℃, which shows optimized pitting resistance.

Key words: marine engineering steel, tempering temperature, corrosion resistance, dislocation density

中图分类号:

TG142.1

车马俊, 周生璇, 杜晓洁, 赵晋斌, 何宜柱, 徐震霖. 回火温度对EH890海洋工程用钢耐蚀性能的影响[J]. 金属热处理, 2022, 47(10): 147-153.

Che Majun, Zhou Shengxuan, Du Xiaojie, Zhao Jinbin, He Yizhu, Xu Zhenlin. Influence of tempering temperature on corrosion resistance of EH890 marine engineering steel[J]. Heat Treatment of Metals, 2022, 47(10): 147-153.

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回火温度对EH890海洋工程用钢耐蚀性能的影响

Influence of tempering temperature on corrosion resistance of EH890 marine engineering steel

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