Nb-V复合微合金化对管线钢再加热奥氏体影响规律研究

马启林; 贾书君; 阴树标; 李拔; 刘清友

doi:10.7513/j.issn.1004-7638.2023.01.025

Nb-V复合微合金化对管线钢再加热奥氏体影响规律研究

doi: 10.7513/j.issn.1004-7638.2023.01.025

马启林^{1, 2,},
贾书君^2, ,,
阴树标¹,
李拔²,
刘清友²

1.
昆明理工大学冶金与能源工程学院, 云南昆明650093
2.
钢铁研究总院工程用钢所, 北京 100065

基金项目: 国家重点研发计划项目（2018YFC0310302）；河北省重点研发计划项目（19211007D）。

详细信息

作者简介:
马启林，1997年出生，男，湖南常德人，硕士研究生，主要研究方向：X80管线钢，E-mail:maqilin0812@163.com

通讯作者:
贾书君，女，教授级高工，主要研究方向：高钢级管线钢，E-mail: jiashujun@cisri.com.cn

中图分类号: TF704.2,TG156
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- 文章访问数: 94
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- 被引次数: 0
出版历程
- 收稿日期: 2021-08-10
- 刊出日期: 2023-02-28

Research on the effect of Nb-V composite microalloying on austenite recrystallization of pipeline steel

Ma Qilin^{1, 2
,},
Jia Shujun^{2
, ,},
Yin Shubiao¹,
Li Ba²,
Liu Qingyou²

1.
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
2.
Engineering Steel Institute, Central Iron and Steel Research Institute, Beijing 100065, China

摘要

摘要: 借助光学显微镜（OM）、高分辨透射电镜（HRTEM）等分析手段，通过热处理试验,热力学模型计算及therme-cacl软件分析等，研究了再加热过程中管线钢奥氏体晶粒尺寸和微合金元素溶解和析出行为之间的耦合关系。结果表明，试验钢在再加热温度1180 ℃、保温1.5 h时，此时奥氏体晶粒尺寸存在以下规律：Nb钢(61.14 μm±5.59 μm)<Nb-V钢(63.84 μm±5.52 μm)<V钢(71.89 μm±6.8 μm)，此时Nb钢奥氏体中Nb元素的固溶量为0.064%，而Nb-V试验钢的固溶量为0.05%，此时两种试验钢在奥氏体中固溶的Nb含量差仅有0.014个百分点。通过建立热力学模型计算发现，在1050~1250 ℃温度区间内奥氏体晶粒长大激活能关系为Q_{Nb_钢}>Q_{Nb-V_钢}>Q_{V_钢}，进一步证实在该阶段奥氏体晶粒的长大主要与Nb元素固溶量成正相关。在再加热温度1180 ℃、保温1.5 h下Nb-V试验钢和Nb钢原奥氏体晶粒尺寸、Nb固溶量都在相近的范围内，从再加热阶段进一步验证了含V管线钢的可行性。
- 管线钢 /
- Nb-V复合微合金化 /
- 奥氏体晶粒尺寸 /
- 第二相析出 /
- 激活能
Abstract: Through heat treatment test, microstructure observation, thermodynamic model calculation and thermo-cacl software, the austenite grain size as well asthe dissolution and precipitation behavior of microalloying elements in pipeline steel during reheating had been investigated.. The results show that when the test steel is reheated at 1180 ℃ and held for 1.5 hours, the austenite grain size order is as follows: Nb steel (61.14 μm±5.59 μm)<Nb-V steel (63.84 μm±5.52 μm)<V steel (71.89 μm ±6.8 μm) . Under this condition, the solid solution Nb content of Nb steel is 0.064%, while the solid solution Nb content of Nb-V test steel is 0.05%. The difference between the solid solution Nb content of the two test steels in austenite is only 0.014%. The predication from established thermodynamic model shows that the activation energy of austenite grain growth in the temperature range of 1050 ℃ to 1250 ℃ exists in QNb steel>QNb-V steel>QV steel, which further confirms that the growth of austenite grains at this stage is mainly positively correlated with the solid solution amount of Nb element. Under investigated reheating condition, the prior austenite grain size and solid solution Nb content in Nb-V test steel is similar to that of Nb steel, which confirms the feasibility of Nb-V microalloying pipeline steel from the prospective of reheating stage.
- pipeline steel /
- Nb-V composite microalloying /
- austenite grain size /
- second phase precipitation /
- activation energy

HTML全文

图 1 试验钢在1180 ℃保温不同时间奥氏体长大情况

Figure 1. Austenite growth in experimental steel reheated at 1180 ℃ for different time

(a) Nb, 0.5 h; (b) Nb, 1 h; (c) Nb, 3 h; (d) Nb-V, 0.5 h; (e) Nb-V, 1 h; (f) Nb-V, 3 h; (g) V, 0.5 h; (h) V, 1 h; (i) V, 3 h

下载: 全尺寸图片幻灯片

图 2 试验钢在保温1.5 h不同待温温度奥氏体长大情况

Figure 2. The austenite growth of experimental steel at different holding temperature for 1.5 h

(a) Nb, 1 050 ℃; (b) Nb, 1 180 ℃; (c) Nb, 1 250 ℃; (d) Nb-V, 1 050 ℃; (e) Nb-V, 1 180 ℃; (f) Nb-V, 1 250 ℃; (g) V, 1 050 ℃; (h) V, 1 180 ℃; (i) V,1 250 ℃

下载: 全尺寸图片幻灯片

图 3 (a)试验钢在1180 ℃不同保温时间下的奥氏体平均晶粒尺寸；(b)试验钢在保温1.5 h不同待温温度奥氏体平均晶粒尺寸

Figure 3. (a)The austenite grain size of the experimental steel reheated at 1180 ℃ for different holding times; (b) The austenite grain size of the experimental steel reheated at different holding temperatures for 1.5 h

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图 4 （a）Nb、Nb-V试验钢中Nb元素在奥氏体中的固溶情况；（b）Nb-V、V试验钢中V元素在奥氏体中的溶解情况

Figure 4. (a) the solid solution of Nb element in austenite in Nb and Nb-V experimental steel; (b) the dissolution of V element in austenite in Nb-V and V experimental steel

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图 5 (a)保温1.5 h再加热不同的温度lnD与T ⁻¹的关系；(b)不同保温时间时lnD与t的关系

Figure 5. (a) The relationship between lnD and T ⁻¹ after holding for 1.5 h and heating at different temperatures; (b) The relationship between lnD and t for different holding time

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图 6 试验钢加热1180 ℃待温1.5 h后第二相的析出情况

(a)、(b)、(c)：Nb钢；(d)、(e)、(f)：Nb-V钢；(g)、(h)、(i)：V钢

Figure 6. The precipitation of the second phase in the experimental steel after heating at 1 180 ℃ for 1.5 h

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表 1 试验钢主要化学成分

Table 1. Main chemical compositions of experimental steel %

钢种 Ac₃/℃ C Mn Si Nb V Ti Cr+Mo+Cu+Ni

Nb 830 0.054 1.73 0.214 0.080 0.012 0.62
Nb-V 833 0.055 1.73 0.221 0.050 0.031 0.010 0.62
V 838 0.043 1.70 0.205 0.073 0.007 0.62

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