控冷冷速对高性能桥梁钢组织和力学性能的影响

doi:10.13228/j.boyuan.issn0449-749x.20130633

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Abstract In order to get a lower yield ratio and higher toughness of the high performance bridge steel Q500qE, relationship between microstructure and mechanical properties of the test steel varied with cooling rate was investigated with the Gleeble-3800 simulator. The results indicated that the microstructure of the test steel is primarily acicular ferrite (AF) and granular bainite ferrite (GBF) in all cooling rate, dispersed with M-A constituent under 5-25 ℃/s. Grain size of ferrite and maximum chord of M-A constituents decreased with the increasing of cooling rate, while the strength and yield ratio increased. The proper range of cooling rate for 500 MPa graded high performance bridge steel has been confirmed as 15-20 ℃/s.

Received: 13 November 2013 Published: 05 August 2014

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	Articles by authors
	WU Nian-Chun
	CUI Jiang
	FAN Yi
	LI Heng-Kun
	LI Xiang

Cite this article:

WU Nian-Chun,CUI Jiang,FAN Yi等. Effect of Controlled Cooling Rate on Microstructure and Mechanical Properties of a High Perfomance Steel for Bridge[J]. Iron and Steel, 2014, 49(8): 94-99.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20130633 OR http://www.chinamet.cn/Jweb_gt/EN/Y2014/V49/I8/94

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