直轧条件下含Nb钢筋中Nb(C, N)的析出强化机理及控冷工艺优化

doi:10.13251/j.issn.0254-6051.2021.08.025

金属热处理 ›› 2021, Vol. 46 ›› Issue (8): 133-138.DOI: 10.13251/j.issn.0254-6051.2021.08.025

直轧条件下含Nb钢筋中Nb(C, N)的析出强化机理及控冷工艺优化

张宏亮, 冯光宏, 王宝山

钢铁研究总院冶金工艺研究所, 北京 100081

收稿日期:2021-04-07 出版日期:2021-08-25 发布日期:2021-12-09
作者简介:张宏亮(1985—),男,高级工程师,博士,主要研究方向为钢铁材料组织和性能控制,E-mail:a154307@163.com
基金资助:
国家科技支撑计划(2013BAE07B04);国家重点研发计划(2017YFB0304000)

Strengthening mechanism of Nb(C, N) precipitation and controlled cooling process optimization of Nb-containing steel bars under direct rolling condition

Zhang Hongliang, Feng Guanghong, Wang Baoshan

Metallurgy Department, Central Iron and Steel Research Institute, Beijing 100081, China

Received:2021-04-07 Online:2021-08-25 Published:2021-12-09

摘要/Abstract

摘要： 为了解决方坯直轧工艺生产含Nb钢筋出现的强化效果不显著问题,通过经典形核理论计算了Nb(C, N)在奥氏体中沉淀析出动力学行为特点,并通过现场控冷工艺试验验证了理论计算的结果。结果表明,加热炉轧制生产含Nb钢筋过程中Nb(C, N)的沉淀析出以晶界形核为主,方坯直轧工艺生产含Nb钢筋过程中Nb(C, N)的沉淀析出以位错形核为主;在含Nb钢筋的成分体系下,Nb(C, N)在奥氏体中沉淀析出过程中的晶界形核和位错形核C曲线鼻尖点温度分别约为1000 ℃和900 ℃;方坯直轧工艺生产含Nb钢筋可以在精轧机架间设置多段预穿水,以保证足够低的终轧温度,来获得Nb(C, N)沉淀析出的最佳强化效果。

关键词: 直轧工艺, Nb(C, N)析出强化, 形核机制, 控冷工艺

Abstract: In order to improve the problem of insignificant strengthening effect of Nb-containing steel bars when produced by billet direct rolling process, the kinetic behavior of Nb(C, N) precipitation in austenite was calculated through classical nucleation theory, then verified through field controlled cooling process experiments. The results show that the main precipitation modes of Nb (C, N) in austenite are grain boundary nucleation for rolling by using heating furnace and dislocation nucleation for billet direct rolling, and for the composition of tested Nb-containing steel bars, the corresponding nose tip temperature of PTT curves for grain boundary nucleation and dislocation nucleation is about 1000 ℃ and 900 ℃, respectively. The optimum strengthening effect of Nb(C, N) precipitation in direct rolling process can be obtained by setting multi-stage pre-penetrating water between finishing stands to ensure low-enough final rolling temperature.

Key words: direct rolling process, Nb(C, N) precipitation strengthening, nucleation mechanism, controlled cooling process

中图分类号:

TG142.1

张宏亮, 冯光宏, 王宝山. 直轧条件下含Nb钢筋中Nb(C, N)的析出强化机理及控冷工艺优化[J]. 金属热处理, 2021, 46(8): 133-138.

Zhang Hongliang, Feng Guanghong, Wang Baoshan. Strengthening mechanism of Nb(C, N) precipitation and controlled cooling process optimization of Nb-containing steel bars under direct rolling condition[J]. Heat Treatment of Metals, 2021, 46(8): 133-138.

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直轧条件下含Nb钢筋中Nb(C, N)的析出强化机理及控冷工艺优化

Strengthening mechanism of Nb(C, N) precipitation and controlled cooling process optimization of Nb-containing steel bars under direct rolling condition

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