终轧温度对Ti-V-Mo复合微合金钢组织演变和硬度的影响

doi:10.11901/1005.3093.2018.522

材料研究学报

2019, Vol. 33

Issue (3): 191-198 DOI: 10.11901/1005.3093.2018.522

本期目录 | 过刊浏览

终轧温度对Ti-V-Mo复合微合金钢组织演变和硬度的影响

张可¹(

),赵时雨¹,隋凤利¹,李昭东²,叶晓瑜³,孙新军²,黄贞益¹,雍岐龙²

1. 安徽工业大学冶金工程学院马鞍山 243032
2. 钢铁研究总院工程用钢所北京 100081
3. 钒钛资源综合利用国家重点实验室(攀钢集团有限公司) 攀枝花 617000

Effect of Finish Rolling Temperature on Microstructure Evolution and Hardness of Ti-V-Mo Complex Microalloyed Steel

Ke ZHANG¹(

),Shiyu ZHAO¹,Fengli SUI¹,Zhaodong LI²,Xiaoyu YE³,Xinjun SUN²,Zhenyi HUANG¹,Qilong YONG²

1. School of Metallurgical Engineering, Anhui University of Technology, Maanshan 243002, China
2. Institute of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China
3. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua Group Co., Ltd., Panzhihua 617000, China

引用本文:

张可,赵时雨,隋凤利,李昭东,叶晓瑜,孙新军,黄贞益,雍岐龙. 终轧温度对Ti-V-Mo复合微合金钢组织演变和硬度的影响[J]. 材料研究学报, 2019, 33(3): 191-198.
Ke ZHANG, Shiyu ZHAO, Fengli SUI, Zhaodong LI, Xiaoyu YE, Xinjun SUN, Zhenyi HUANG, Qilong YONG. Effect of Finish Rolling Temperature on Microstructure Evolution and Hardness of Ti-V-Mo Complex Microalloyed Steel[J]. Chinese Journal of Materials Research, 2019, 33(3): 191-198.

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摘要:

采用Gleeble3800热模拟试验机、OM、EBSD、TEM及Vickers硬度计等研究终轧温度对Ti-V-Mo复合微合金钢的组织转变、析出相和硬度的影响，并阐明了组织演变和硬度变化的原因。结果表明，不同终轧温度的Ti-V-Mo钢其组织均为多边形铁素体；随着终轧温度由1000℃降低到800℃，Ti-V-Mo钢的硬度由400HV提高到427HV；铁素体晶粒的平均尺寸由3.44 μm减小到3.05 μm；(Ti, V, Mo)C粒子的析出数量增加，其平均尺寸由8.38 nm减小到6.25 nm。随着终轧温度的降低，铁素体平均晶粒尺寸的减小和纳米级(Ti, V, Mo)C粒子的增多及细化是硬度增大的主要因素。在980℃以下，降低终轧温度(Ti, V, Mo)C在奥氏体中的形核率不断减小，使得其在铁素体中析出的10 nm以下的(Ti, V, Mo)C粒子不断增多，促进了硬度的提高。

关键词 ：金属材料, Ti-V-Mo复合微合金钢, 终轧温度, 硬度, 铁素体, (Ti，V，Mo)C

Abstract：

The effect of finish rolling temperature on microstructure, precipitates, hardness of Ti-V-Mo microalloyed steel was investigated by means of Gleeble3800 thermal-mechanical simulator, OM, SEM, TEM and Vickers-hardness tester. The results show that the microstructures of Ti-V-Mo microalloyed steel, which was finish-rolled at different temperatures, consist of all polygonal ferrite, and the finish rolling temperature has a major impact on the precipitates and hardness. When the finish rolling temperature decreases from 1000^oC to 800^oC, the hardness increases from 400 HV to 427 HV. Meanwhile, the average grain size of ferrite in Ti-V-Mo microalloyed steel decreases gradually from 3.44 μm to 3.05 μm and the amount of (Ti, V, Mo)C particles increase monotonously, while their mean size reduces from 8.38 nm to 6.25 nm. The main factors responsible to the enhancement of hardness are the refinement of average ferrite grain size as well as the increasing amount and further refinement of nano-sized (Ti, V, Mo)C particles as the finish rolling temperature decreases. The nucleation rate of (Ti, V, Mo)C carbides in austenite decreased when the finish rolling temperature below 980^oC, while more tiny particles precipitated from ferrite matrix, which promotes the increase of hardness.

Key words： metallic materials Ti-V-Mo complex microalloyed steel finish rolling temperature hardness ferrite (Tim,V,Mo)C

收稿日期: 2018-08-27

ZTFLH:

TG142.1

基金资助:国家重点研发计划(2017YFB0305100);国家重点研发计划(2017YFB0304700);国家自然科学基金(1704008);国家自然科学基金(51574001);国家自然科学基金(1674004);钒钛资源综合利用国家重点实验室开放基金(8100009);安徽工业大学青年科研基金(QZ201603)

作者简介: 张可，男，1983年生，博士

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	张可
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	孙新军
	黄贞益
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链接本文:

https://www.cjmr.org/CN/10.11901/1005.3093.2018.522 或 https://www.cjmr.org/CN/Y2019/V33/I3/191

图1 Ti-V-Mo钢的热模拟工艺示意图

图2 Ti-V-Mo钢不同终轧温度下的OM像

图3 Ti-V-Mo钢中各相的含量随温度的变化

图4 不同终轧温度Ti-V-Mo钢的EBSD像

图5 不同终轧温度Ti-V-Mo钢的晶界取向差分布

图6 不同终轧温度试样的TEM像

图7 终轧温度不同的试样中(Ti, V, Mo)C的尺寸分布

图8 不同形变储能条件下(Ti, V, Mo)C在奥氏体中的形核率温度曲线[24]

图9 在800℃和1000℃终轧试样的TEM像

图10 不同终轧温度试样的硬度

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