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金属学报  2018, Vol. 54 Issue (10): 1368-1376    DOI: 10.11900/0412.1961.2018.00119
  本期目录 | 过刊浏览 |
V-N微合金钢在线快速感应回火工艺中V(C, N)析出强化机制
李晓林1(), 崔阳1, 肖宝亮1, 张大伟1, 金钊2, 程政2
1 首钢集团有限公司技术研究院绿色可循环钢铁流程北京市重点实验室 北京 100043
2 首钢京唐钢铁联合有限责任公司 唐山 063200
Effects of On-Line Rapid Induction Tempering on Pricipitation Strengthening Mechanism of V(C, N) in V-N Microalloyed Steel
Xiaolin LI1(), Yang CUI1, Baoliang XIAO1, Dawei ZHANG1, Zhao JIN2, Zheng CHENG2
1 Beijing Key Laboratory of Green Recyclable Process for Iron & steel Production Technology, Research Institute of Technology, Shougang Group Co. Ltd., Beijing 100043, China;
2 Shougang Jingtang Steel Company, Tangshan 063200, China
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摘要: 

利用SEM、TEM以及三维原子探针(3DAP)等分析方法,研究了V-N微合金钢在线快速感应回火过程中,不同保温时间对力学性能以及析出强化机理的影响。结果表明,未经回火组织为粒状贝氏体;经过600 ℃回火后,组织为粒状贝氏体+铁素体。试样在600 ℃回火,保温300 s,硬度和屈服强度出现峰值,分别为330.45 HV和815 MPa,与未回火试样相比,屈服强度增加了173 MPa。屈服强度的增加主要依靠V或者VN原子团簇,团簇中V、N原子的分布近似单原子层,类似析出相的GP区,其内部总的原子数量在20~100个之间,这些细小的纳米团簇与位错有较强的相互作用,与V(C, N)析出相相比,V或VN团簇具有更佳的强化效果。

关键词 三维原子探针(3DAP)在线快速感应回火V-N微合金钢团簇强化    
Abstract

The low carbon bainite steel with high strength, excellent toughness and plasticity was widely used for pipeline, engineering machinery, ocean station vessel and other fields. The light weight of structure of construction machines puts forward higher requirements for performance of steel, which promotes the development and application of low carbon microalloyed steel. A low carbon bainite steel combined with V-N microalloyed was designed for engineering machinery, to upgrade performance by microstructure control and the refinement and dispersion control of precipitates. This steel was tempered on-line with rapid heating rate after controlled rolling and accelerated cooling process. Effects of different holding time under rapid induction tempering on precipitation strengthening mechanism and mechanical property of V-N microalloyed steel were investigated by using three dimensional atom probe (3DAP), SEM and TEM. The results showed that the main microstructures of tested steel are granular bainite before tempering, and granular bainite and ferrite appears after tempering at 600 ℃. The hardness and yield strength values reached its peak at 600 ℃ tempered for 300 s, which were 330.45 HV and 815 MPa, respectively. Compared with untempered sample, the measured strengthening increment in yield strength was 173 MPa which was due to the V-rich or VN-rich clusters with 20~100 atoms distributing similar to monoatomic layer and resembled the GP zones. These small nanoclusters have strong interaction with dislocation, and compared with V(C, N) particles, V or VN clusters have better strengthening effect.

Key wordsthree dimensional atom probe (3DAP)    on-line rapid induction tempering    V-N microalloyed steel    cluster strengthening
收稿日期: 2018-03-30     
ZTFLH:  TG142. 1  
作者简介:

作者简介 李晓林,男,1985年生,工程师,博士

引用本文:

李晓林, 崔阳, 肖宝亮, 张大伟, 金钊, 程政. V-N微合金钢在线快速感应回火工艺中V(C, N)析出强化机制[J]. 金属学报, 2018, 54(10): 1368-1376.
Xiaolin LI, Yang CUI, Baoliang XIAO, Dawei ZHANG, Zhao JIN, Zheng CHENG. Effects of On-Line Rapid Induction Tempering on Pricipitation Strengthening Mechanism of V(C, N) in V-N Microalloyed Steel. Acta Metall Sin, 2018, 54(10): 1368-1376.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2018.00119      或      https://www.ams.org.cn/CN/Y2018/V54/I10/1368

图1  热轧工艺示意图
图2  试样快速加热回火至600 ℃保温时间对硬度和屈服强度的影响
图3  试样快速加热至600 ℃回火、不同保温时间的SEM像
图4  试样快速加热至 600 ℃回火、不同保温时间薄膜试样的TEM像
图5  600 ℃回火保温300 s时试样中析出相复型HRTEM像、EDS分析、单个V(C, N)析出粒子和析出相反Fourier变换后的晶格像
图6  试样快速加热至600 ℃保温300 s后C、Cr、Mo和V原子、VN团簇和V原子浓度1%时团簇的三维空间分布
图7  试样快速加热至600 ℃保温300和600 s时C、V、VN在团簇中的分布
图8  试样快速加热600 ℃回火保温300 s时试样中团簇的溶质浓度与团簇大小的关系
图9  试样快速加热600 ℃回火保温300和600 s时试样中团簇和析出的V原子数量与团簇大小的关系
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