珠光体组织对重轨钢U71Mn腐蚀行为的影响

doi:10.11896/cldb.20010044

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Abstract The corrosion behaviors of U71Mn heavy rail steel with different perlite lamellar spacing were studied by accelerated corrorsion test in simulated atmopheric environment. The microstructure and corrosion results of heavy rail steel were measured by FESEM, XRD and electrochemical measurement. The pearlite interlaminar spacing of U71Mn heavy rail steel under different cooling way were 155 nm, 241 nm, 340 nm and 446 nm. The corrosion weight loss and corrosion rate decreased significantly with the decrease of pearlite interlaminar spacing. When the pearlite lamellar spacing was 155 nm, the corrosion rate was the lowest, which was 0.001 4 mg·cm^-2·h^-1. There were α-FeOOH, γ-FeOOH and Fe₃O₄ in the rust layer of 4 samples. When the pearlite lamellar spacing was less than 241 nm, the peak value of α-FeOOH was obviously enhanced, and a small amount of α-Fe₂O₃ appeared in the corrosion products, and the rust layer was relatively dense. The formation time of dense rust layer was 120 h earlier than 240 h, and the thickness and compactness of the inner rust layer were obviously improved when the pear-lite lamellar spacing decreased from 446 nm to 155 nm. The corrosion current density was minimun and corrosion potential was maximum when the pearlite interlaminar spacing was 155 nm after 480 hours of corrosion, which had the best resistance to atmospheric corrosion.

Key words： U71Mn heavy rail steel pearlite structure corrosion behavior NaHSO₃ medium atmospheric corrosion

Published: 01 July 2021

CLC number:

TG174

Fund:National Natural Science Foundation of China (51664046,51874186).

About author:: Shijie Wu,studying for a master's degree at Inner Mongolia University of Science and Technology from 2018 to 2020. His currently research content the impact of heavy rail steel structure on atmospheric corrosion.Participa-ting in research projects include the influence of high-speed heavy rail steel organization on the atmospheric corrosion performance of the heavy rail.
Jun Peng, professor, Inner Mongolia University of Science and Technology, graduated from School of Me-tallurgy and Ecology Engineering, University of Science and Technology Beijing, and worked in the School of Materials and Metallurgy, Inner Mongolia University of Science and Technology in 2009. The research field are the second phase in steel and comprehensive utilization of secondary resources.More than 30 academic papers have been published in domestic and foreign journals, 3 papers have been searched by SCI and 7 papers have been retrieved by EI.At present, he has presided over the research on the influence of rare earth cerium on the precipitation behavior of titanium compounds in titanium microalloyed steel (NSFC), and participated the research on the influence of pearlite structure on atmospheric corrosion resistance of heavy rail steel (NSFC).

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	WU Shijie
	LIU Lixia
	PENG Jun
	WANG Xiaoli
	JIAO Haidong
	HUO Qinan

Cite this article:

WU Shijie,LIU Lixia,PENG Jun, et al. Effect of Pearlite Structure on Corrosion Behavior of U71Mn Heavy Rail Steel[J]. Materials Reports, 2021, 35(12): 12147-12155.

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http://www.mater-rep.com/EN/10.11896/cldb.20010044 OR http://www.mater-rep.com/EN/Y2021/V35/I12/12147

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