Ti-V-Mo复合微合金钢中(Ti, V, Mo)C在<i>γ</i> /<i>α</i>中沉淀析出的动力学

doi:10.11900/0412.1961.2018.00011

金属学报

2018, Vol. 54

Issue (8): 1122-1130 DOI: 10.11900/0412.1961.2018.00011

本期目录 | 过刊浏览

Ti-V-Mo复合微合金钢中(Ti, V, Mo)C在γ /α中沉淀析出的动力学

张可^1,²(

), 孙新军³, 张明亚^1,², 李昭东³, 叶晓瑜⁴, 朱正海^1,², 黄贞益^1,², 雍岐龙³

1 安徽工业大学冶金工程学院马鞍山 243032
2 安徽工业大学冶金减排与资源综合利用教育部重点实验室马鞍山 243032
3 钢铁研究总院工程用钢所北京 100081
4 攀钢集团有限公司钒钛资源综合利用国家重点实验室攀枝花 617000

Kinetics of (Ti, V, Mo)C Precipitated in γ /α Matrix of Ti-V-Mo Complex Microalloyed Steel

Ke ZHANG^1,²(

), Xinjun SUN³, Mingya ZHANG^1,², Zhaodong LI³, Xiaoyu YE⁴, Zhenghai ZHU^1,², Zhenyi HUANG^1,², Qilong YONG³

1 School of Metallurgical Engineering, Anhui University of Technology, Maanshan 243032, China
2 Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Ministry of Education, Anhui University of Technology, Maanshan 243032, China;
3 Institute of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China
4 State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua Group Co., Ltd., Panzhihua 617000, China

引用本文:

张可, 孙新军, 张明亚, 李昭东, 叶晓瑜, 朱正海, 黄贞益, 雍岐龙. Ti-V-Mo复合微合金钢中(Ti, V, Mo)C在γ /α中沉淀析出的动力学[J]. 金属学报, 2018, 54(8): 1122-1130.
Ke ZHANG, Xinjun SUN, Mingya ZHANG, Zhaodong LI, Xiaoyu YE, Zhenghai ZHU, Zhenyi HUANG, Qilong YONG. Kinetics of (Ti, V, Mo)C Precipitated in γ /α Matrix of Ti-V-Mo Complex Microalloyed Steel[J]. Acta Metall Sin, 2018, 54(8): 1122-1130.

全文: PDF(852 KB) HTML

摘要:

根据多元复合析出相的固溶析出理论和经典形核长大动力学理论,计算了Ti-V-Mo复合微合金钢中(Ti, V, Mo)C在奥氏体(γ)和铁素体(α)中沉淀析出的形核参量、析出-时间-温度(PTT)曲线、形核率-温度(NrT)曲线,并探讨了奥氏体中形变储能和形变诱导析出量对(Ti, V, Mo)C在γ /α中沉淀析出动力学的影响。结果表明,复合析出相(Ti, V, Mo)C在γ /α中沉淀析出的PTT曲线呈典型的“C”曲线形状,而NrT曲线表现为典型的反“C”曲线形状,(Ti, V, Mo)C在γ中的最快析出温度为1020~1050 ℃。增加γ的形变储能,使(Ti, V, Mo)C在γ中沉淀析出的PTT曲线向左上方移动。增加γ中(Ti, V, Mo)C沉淀析出的形变诱导析出量,使(Ti, V, Mo)C在α中沉淀析出的NrT曲线向右下方移动,经计算可知,(Ti, V, Mo)C在α中的最大形核率温度在630~650 ℃,理论计算结果和实验结果吻合较好。

关键词 ： (Ti,V,Mo)C, PTT曲线, NrT曲线, 动力学, 理论计算

Abstract：

In recent years, in order to develop the higher strength steel, the idea of increasing the strength of the hot rolled ferritic steel via complex Ti microalloyed technology has been widely accepted and applied, such as Ti-Nb, Ti-Mo, Ti-Nb-Mo and Ti-V-Mo. It is important to know the thermodynamics and kinetics of complex Ti contained precipitates for controlling the precipitation behavior of carbides and improving the mechanical properties of complex Ti microalloyed steels. In this work, according to the classical nulceation and growth kinetics theory and the solubility products of various carbides in austenite/ferrite (γ /α) matrix, the precipitation-time-temperature (PTT) curve, nucleation-time (NrT) curve and the nucleation parameters of (Ti, V, Mo)C carbides in γ /α matrix of Ti-V-Mo complex microalloyed steel were obtained through the theoretical calculation. Moreover, the effects of deformation stored energy and the amount of strain-induced precipitation in γ matrix on the precipitation kinetics of (Ti, V, Mo)C were discussed. The results showed that the PTT diagrams of (Ti, V, Mo)C in γ /α matrix showed "C" shape curve, while the NrT curves showed inverse "C" shape curve. The nose temperature of (Ti, V, Mo)C in γ matrix is about 1020~1050 ℃. Increasing the deformation stored energy of γ matrix moves the PPT curve to the upper left. In addition, the NrT curve of (Ti, V, Mo)C precipitated in α matrix moves towards to the lower right by properly increasing the amount of strain-induced precipitation in γ matrix. The maximum nucleation rate temperature of (Ti, V, Mo)C in ferrite is around 630~650 ℃ from the theoretical calculation, which agrees well with the result of experimental observation.

Key words： (Ti,V,Mo)C PTT curve NrT curve kinetics theoretical calculation

收稿日期: 2018-01-10

ZTFLH:

TG142.1

基金资助:国家自然科学基金项目Nos.51704008和51674004,国家重点研发计划项目Nos.2017YFB0305100和2017YFB0304700,国家重点基础研究计划项目No.2015CB654803,中国钢研科技集团有限公司科技基金项目No.15G60530A,安徽工业大学青年科研基金项目No.QZ201603及钒钛资源综合利用国家重点实验室开放基金项目No.18100009

作者简介:

作者简介张可,男,1983年生,博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2018.00011 或 https://www.ams.org.cn/CN/Y2018/V54/I8/1122

表1 Ti、V和Mo元素在γ和α中的扩散激活能[15]

表2 TiC、VC和MoC在室温下的点阵常数及线膨胀系数[21,23,24]

图1 Ti-V-Mo钢中微合金元素平衡固溶量[Ti]、[V]、[Mo]和[C]随温度的变化

Temperature	0 Jmol^-1			1360 Jmol^-1			3820 Jmol^-1
℃	$d d *$ / nm	lg(I/K)_d	lg(t_0.05/t₀)	$d d *$ / nm	lg(I/K)_d	lg(t_0.05/t₀)	$d d *$ / nm	lg(I/K)_d	lg(t_0.05/t₀)
800	0.46	-15.180	20.83	0.41	-15.07	20.72	0.30	-15.13	20.78
850	0.55	-15.125	20.18	0.49	-14.86	19.91	0.39	-14.65	19.71
900	0.62	-15.135	19.62	0.55	-14.72	19.20	0.45	-14.34	18.82
950	0.67	-15.041	18.98	0.59	-14.53	18.47	0.48	-14.04	17.98
1000	0.73	-15.043	18.49	0.64	-14.40	17.84	0.51	-13.78	17.23
1050	0.83	-15.519	18.53	0.72	-14.56	17.57	0.57	-13.66	16.67
1100	1.02	-17.024	19.64	0.87	-15.30	17.92	0.66	-13.77	16.39
1150	1.37	-21.270	23.54	1.11	-17.38	19.65	0.80	-14.31	16.58
1200	2.17	-36.908	38.85	1.58	-23.73	25.68	1.04	-15.89	17.84

表3 不同形变储能下(Ti, V, Mo)C在奥氏体中形核参量的计算结果

图2 (Ti, V, Mo)C在奥氏体中析出的NrT和PTT曲线

表4 不同Ti微合金钢中碳化物在奥氏体中的最快析出温度

表5 形变诱导析出量为10%、30%和50%时(Ti, V, Mo)C在铁素体中形核参量的计算结果

图3 形变诱导析出量对(Ti, V, Mo)C在铁素体中沉淀析出的NrT和PTT曲线的影响

图4 Ti-V-Mo钢、Ti-Mo钢和Ti钢在不同卷取温度下的硬度

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