Effect of different heat-treatment processes on corrosion resistance of 17-4PH steel

IF 1.9 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Bulletin of Materials Science Pub Date : 2024-09-18 DOI:10.1007/s12034-024-03300-6

Xiaoqin Chen, Xiaofei Qin, Yue Li, Wenjia Cheng, Haonan Jin, Quan Li

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Abstract

The heat-treatment process exerts a substantial influence on both the quantity and morphology of reversed austenite in 17-4PH stainless steel. In this study, the effects of different ageing treatment methods on the microstructure and corrosion resistance of the steel were investigated. Through the observation of microscopic morphology, it was found that adjustment and ageing treatment and double ageing treatment were more conducive to the migration of elements in the steel than single ageing treatment, and they also improved the microstructure. In addition to improving the uniformity of alloy element distribution, uniformity also controls the reversed austenite content. By controlling the content and distribution of reversed austenite, the stability of the corrosion film formed at the interface can be improved, thereby improving the corrosion resistance of stainless steel. The stainless steel, after adjustment treatment and ageing treatment, has better corrosion resistance. The electrochemical corrosion resistance in a high-temperature and high-pressure underground environment was evaluated based on parameters including passivation current density and passivation potential. The results revealed a significant improvement of 50.5% in electrochemical corrosion resistance and a remarkable increase of 45.96% in pitting corrosion resistance. Furthermore, the FeCl₃ pitting test demonstrated a substantial decrease of 63.16% in pitting density and a reduction of 27.96% in the uniform corrosion rate.

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不同热处理工艺对 17-4PH 钢耐腐蚀性的影响

热处理过程对 17-4PH 不锈钢中反转奥氏体的数量和形态都有很大影响。本研究探讨了不同时效处理方法对钢的微观结构和耐腐蚀性能的影响。通过观察微观形态发现，调整时效处理和双时效处理比单时效处理更有利于钢中元素的迁移，同时也改善了微观结构。除了改善合金元素分布的均匀性，均匀性还能控制反转奥氏体含量。通过控制反转奥氏体的含量和分布，可以提高界面上形成的腐蚀膜的稳定性，从而提高不锈钢的耐腐蚀性。经过调整处理和时效处理的不锈钢具有更好的耐腐蚀性。根据钝化电流密度和钝化电位等参数，对高温高压地下环境中的电化学耐腐蚀性能进行了评估。结果表明，耐电化学腐蚀性能明显提高了 50.5%，耐点蚀性能显著提高了 45.96%。此外，FeCl3 点蚀测试表明，点蚀密度大幅降低了 63.16%，均匀腐蚀速率降低了 27.96%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Bulletin of Materials Science 工程技术-材料科学：综合

CiteScore

3.40

自引率

5.60%

发文量

209

审稿时长

11.5 months

期刊介绍： The Bulletin of Materials Science is a bi-monthly journal being published by the Indian Academy of Sciences in collaboration with the Materials Research Society of India and the Indian National Science Academy. The journal publishes original research articles, review articles and rapid communications in all areas of materials science. The journal also publishes from time to time important Conference Symposia/ Proceedings which are of interest to materials scientists. It has an International Advisory Editorial Board and an Editorial Committee. The Bulletin accords high importance to the quality of articles published and to keep at a minimum the processing time of papers submitted for publication.