钛微合金化HRB400E钢筋组织性能及强化机理

doi:10.13228/j.boyuan.issn1006-9356.20190306

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Abstract

Continues cooling phase transformation behavior and strengthening mechanisms of the Ti-containing steel were systematically studied by thermal simulation testing machine, high-resolution transmission electron microscope and metallographic microscope. The result showed that the microstructure was mainly composed of ferrite and pearlite at the low cooling rate (0.5-1 ℃/s). When the cooling rate was gradually increased (1-5 ℃/s), the bainite structure appeared and the ratio of bainite increased. And the microstructure mainly consisted of bainite at the high cooling rate (5-10 ℃/s). The strengthening mechanisms of the Ti-containing steel were precipitation strengthening and fine-grain strengthening. TiN mainly precipitated as fine particles dispersing and its size was 10-20 nm. The optimized cooling rate was (1.5±0.5) ℃/s for the 20 mm HRB400E steel industry trial production, the yield strength was above 430 MPa, the elongation after fracture was above 20%, the maximum gross elongation was above 15%, and the ratio of tensile strength and yield strength was above 1.4.

Key words： HRB400E rebar continuous cooling phase transformation strengthening mechanism microstructure mechanical property

Received: 24 June 2019

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	Articles by authors
	YANG Xiao-wei
	ZHOU Yun
	CHEN Huan-de
	ZHANG Yu

Cite this article:

YANG Xiao-wei,ZHOU Yun,CHEN Huan-de等. Microstructure and strengthening mechanisms of Ti microalloyed HRB400E rebar[J]. China Metallurgy, 2020, 30(1): 68-72.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20190306 OR http://www.zgyj.ac.cn/EN/Y2020/V30/I1/68

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