两阶段冷却工艺对基于应变设计X70管线钢组织的影响

doi:10.13228/j.boyuan.issn0449-749x.20130713

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Abstract Steel with ferrite-bainite dual phase has been extensively researched for the strain-based designed pipeline applications owing to the high deformation resistance through successively yielding of the two phases. In order to explore the relationships of processes and dual-phase microstructure, the influences of two-stage controlled cooling processes on the microstructure transformation of deformed austenite in strain-based designed X70 pipeline steel are investigated through compression experiments conducted by Gleeble-3800. The results indicates that holding temperature for a short time after slow cooling stage could effectively promote ferrite precipitation, thereby refine ferrite grain. In addition, with the accelerated cooling start temperature lowering, the ferrite fraction increased. During the accelerated cooling stage, either increasing the cooling rate or lowering the cooling finish temperature could decrease the lath width and the sizes of carbides in the bainite structure and then improve the microhardness.

Received: 19 December 2013 Published: 10 September 2014

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	Articles by authors
	XUN Lei-Lei
	BO Meng-Zhuo
	ZHENG Lei

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XUN Lei-Lei,BO Meng-Zhuo,ZHENG Lei. Influences of Two-Stage Cooling Processes on Microstructure of Strain-Based Designed X70 Pipeline Steel[J]. Iron and Steel, 2014, 49(9): 81-86.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20130713 OR http://www.chinamet.cn/Jweb_gt/EN/Y2014/V49/I9/81

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