重载铁路用贝氏体钢轨显微组织定量表征

doi:10.11896/cldb.19090081

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Abstract Recently, bainitic rail steel attracts a lot of attention because of its excellent combination of strength and toughness, good weldability and high resistance of wear and fatigue. In general, the multiphase microstructure of bainitic rail steel contains bainitic ferrite, martensite and retained austenite. Bainitic ferrite and martensite have similar body-centered cubic crystal structure, so how to distinguish bainitic ferrite and martensite and quantitatively characterize the microstructure of bainitic rail steel becomes a difficult problem. In this paper, four kinds of experimental metallographic methods, namely, color metallography, electron backscatter diffraction (EBSD), nano indentation and dilatometer methods accompanied with XRD analysis, were employed to distinguish the martensite and bainitic ferrite and to measure their fractions in bainitic rail steel. The results show that the fractions of bainitic ferrite and martensite analyzed by the four methods are similar, with 47.3vol%—53.5vol% of bainitic ferrite, 40.3vol%—46.5vol% of martensite and 6.2vol% of retained austenite (obtained by XRD), respectively. Among the four methods, color metallography is the most convenient and economical method, while EBSD and nano indentation could distinguish more refined microstructural details in multiphase.

Key words： bainite martensite rail multiphase microstructure quantitative characterization

Published: 02 December 2020

CLC number:

TG142.1

Fund:This work was financially supported by the National Key R&D Program of China (2017YFB0304501).

About author:: Xiaolu Guireceived her M.S. degrees in materials from University of Science and technology Beijing in 2013. She is currently an Experimentalist in Beijing Jiaotong University, focusing on the research of microstructure in steels.Guhui Gaoreceived his Ph.D degree in Materials Science and Engineering from Tsinghua Univeristy in 2013. He is currently an associate professor in Beijing Jiaotong University. His research interests are bainitic transformation and bainitic steels.

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	GUI Xiaolu
	WANG Kun
	SU Hao
	GAO Guhui
	BAI Bingzhe

Cite this article:

GUI Xiaolu,WANG Kun,SU Hao, et al. Quantitative Characterization of Microstructure of Bainitic Rail for Heavy Haul Railway[J]. Materials Reports, 2020, 34(22): 22136-22141.

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http://www.mater-rep.com/EN/10.11896/cldb.19090081 OR http://www.mater-rep.com/EN/Y2020/V34/I22/22136

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