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

doi:10.13251/j.issn.0254-6051.2022.10.024

Abstract

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

CLC Number:

TG142.1

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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