Nb-Mo微合金高强钢强化机理及其纳米级碳化物析出行为<sup>*</sup>

doi:10.11900/0412.1961.2015.00482

金属学报

2016, Vol. 52

Issue (4): 410-418 DOI: 10.11900/0412.1961.2015.00482

论文

本期目录 | 过刊浏览

Nb-Mo微合金高强钢强化机理及其纳米级碳化物析出行为^*

张正延^1,²,孙新军¹(

),雍岐龙^1,²,李昭东¹,王振强³,王国栋²

1 钢铁研究总院工程用钢研究所, 北京 100081
2 东北大学轧制技术及连轧自动化国家重点实验室, 沈阳 110819
3 哈尔滨工程大学材料与化学工程学院, 哈尔滨 150001

PRECIPITATION BEHAVIOR OF NANOMETER-SIZED CARBIDES IN Nb-Mo MICROALLOYED HIGH STRENGH STEEL AND ITS STRENGTHENING MECHANISM

Zhengyan ZHANG^1,²,Xinjun SUN¹(

),Qilong YONG^1,²,Zhaodong LI¹,Zhenqiang WANG³,Guodong WANG²

1 Department of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China
2 State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
3 College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China

引用本文:

张正延,孙新军,雍岐龙,李昭东,王振强,王国栋. Nb-Mo微合金高强钢强化机理及其纳米级碳化物析出行为^*[J]. 金属学报, 2016, 52(4): 410-418.
Zhengyan ZHANG, Xinjun SUN, Qilong YONG, Zhaodong LI, Zhenqiang WANG, Guodong WANG. PRECIPITATION BEHAVIOR OF NANOMETER-SIZED CARBIDES IN Nb-Mo MICROALLOYED HIGH STRENGH STEEL AND ITS STRENGTHENING MECHANISM[J]. Acta Metall Sin, 2016, 52(4): 410-418.

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摘要:

采用SEM, EBSD, HRTEM和物理化学相分析等技术分别对0.1%Nb和0.1%Nb-0.19%Mo微合金低碳热轧钢进行了微观组织形貌、钢中析出相及强化机理的观测和分析. 结果表明, 与Nb钢相比, Nb-Mo钢的组织较为细小, 组织中小角度晶界密度也较高, 且Mo的添加使得Nb的析出率升高, 尺寸在10 nm以下的纳米级MC型析出相(Nb, Mo)C含量较高, 这种纳米级析出相(Nb, Mo)C具有较低的熟化速率, 不易粗化, 因此具有较高的沉淀强化增量, 这也是Nb-Mo钢强度高于Nb钢的主要原因.

关键词 ： Nb-Mo微合金化, 强化机理, 纳米级碳化物, 析出

Abstract：

Recently, increasing attention has been focused on the high strength low alloy (HSLA) steels mircoalloyed with multiple miroalloying elements, such as Nb-Ti, Nb-V and Ti-Mo, which can form synthetic carbide in steel, such as (Nb, Ti)C, (Nb, V)C and (Ti, Mo)C. Compared with the simplex carbide, such as NbC, TiC, those synthetic carbides with nanometer size exhibiting a superior thermal stability to exert their powerful influence mainly through their precipitation hardening in ferrite. It is reported that the precipitation hardening of approximate 300 MPa which can be obtained in Ti-Mo-bearing steel was developed by JFE steel, attributing to the synthetic (Ti, Mo)C particle precipitated in ferrite. However, as common microalloying elements, Nb and Mo are added synchronously in steel. The strengthening mechanism of Nb-Mo mircoalloyed as-rolled steel and the role of the carbide precipitated in Nb-Mo mircoalloyed as-rolled steel are rarely reported. Therefore, in the present study, the strengthening mechanism, microstructure and the precipitate characteristics of Nb and Nb-Mo microalloyed steels produced by thermo mechanical control process (TMCP) were comparatively investigated by means of SEM, EBSD, HRTEM and physical and chemical phase analysis, in order to systematically study the synergistic effect of Nb-Mo addition on the strength of as-rolled steel. The results shows that the microstructure is finer and the density of low-angle grain boundaries is higher in Nb-Mo microalloyed steel compared with that of in the Nb microalloyed steel. What's more, the Mo addition could increase the precipitation ratio of Nb, and the amount of the MC-type carbide with nanometer size in Nb-Mo microalloyed steel is evidently larger than that of in Nb microalloyed steel. Those MC-type carbide were identified as synthetic carbide (Nb, Mo)C, exhibiting low coarsening rate than that of NbC precipitated in Nb microalloyed steel, which thus contributed to a higher precipitation hardening. This is main reason of the difference in strength between Nb and Nb-Mo microalloyed steel.

Key words： Nb-Mo microalloyed strength mechanism nanometer-sized carbide precipitation

收稿日期: 2015-09-15

基金资助:* 国家重点基础研究发展计划项目2015CB654803和国家高技术研究发展计划项目2015AA034302资助

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https://www.ams.org.cn/CN/10.11900/0412.1961.2015.00482 或 https://www.ams.org.cn/CN/Y2016/V52/I4/410

表1 Nb和Nb-Mo微合金钢的化学成分

图1 Nb和Nb-Mo微合金钢室温拉伸的应力-应变曲线

表2 Nb和Nb-Mo微合金钢的室温横向拉伸性能

图2 Nb和Nb-Mo微合金钢的SEM像

图3 Nb和Nb-Mo微合金钢的EBSD晶界分布图及晶界密度对比图

图4 奥氏体中析出的MC型粒子的HRTEM像及其与铁素体的位向关系

图5 Nb和Nb-Mo微合金钢中在铁素体中析出的纳米级析出相形貌的TEM像及其对应粒子的EDS

图6 Nb和Nb-Mo微合金钢中萃取的析出相的XRD谱

表3 Nb和Nb-Mo微合金钢析出相中各元素的含量

图7 Nb和Nb-Mo微合金钢中MC型析出相的粒度分布

表4 Nb和Nb-Mo微合金钢中各尺寸范围的析出相的体积分数及所产生的沉淀强化增量

图8 Nb和Nb-Mo微合金钢的强化方式叠加分析

图9 Nb和Nb-Mo微合金钢中的析出相在铁素体中的熟化速率随温度的变化曲线

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