加热工艺对Nb-Ti微合金化钢晶粒长大行为的影响

doi:10.13251/j.issn.0254-6051.2025.06.035

金属热处理 ›› 2025, Vol. 50 ›› Issue (6): 229-234.DOI: 10.13251/j.issn.0254-6051.2025.06.035

加热工艺对Nb-Ti微合金化钢晶粒长大行为的影响

张建平^1,2, 黄健^1,2, 徐海健³, 庞宗旭^1,2, 王勇^1,2, 李天怡^1,4

1.海洋装备金属材料及其应用全国重点实验室, 辽宁鞍山 114009;
2.鞍钢集团钢铁研究院, 辽宁鞍山 114009;
3.鞍钢股份有限公司, 辽宁鞍山 114009;
4.鞍钢集团北京研究院有限公司, 北京 102200

收稿日期:2024-12-01 修回日期:2025-03-17 出版日期:2025-06-25 发布日期:2025-07-08
作者简介:张建平(1992—),男,工程师,硕士,主要研究方向为专项用钢,E-mail:ansteelzjp@163.com

Effect of heating process on grain growth behavior of Nb-Ti microalloyed steel

Zhang Jianping^1,2, Huang Jian^1,2, Xu Haijian³, Pang Zongxu^1,2, Wang Yong^1,2, Li Tianyi^1,4

1. State Key Laboratory of Metallic Materials for Marine Equipment and Applications, Anshan Liaoning 114009, China;
2. Iron & Steel Research Institute of Ansteel Group, Anshan Liaoning 114009, China;
3. Angang Steel Co., Ltd., Anshan Liaoning 114009, China;
4. Ansteel Beijing Research Institute Co., Ltd., Beijing 102200, China

Received:2024-12-01 Revised:2025-03-17 Online:2025-06-25 Published:2025-07-08

摘要/Abstract

摘要： 对Nb-Ti微合金化钢进行1050~1250 ℃×5~240 min 等温奥氏体化热处理,研究不同加热工艺下奥氏体晶粒长大行为,利用Thermo-calc和TEM分析不同加热工艺下第二相粒子的析出规律,并通过Humphreys模型对晶粒长大方式进行预测。结果表明,随着奥氏体化温度的升高和保温时间的延长,晶粒尺寸逐渐增大。当保温时间为60 min时,各温度下晶粒尺寸不再剧烈变化,长大趋势逐渐减缓;当保温时间为60 min时,随着奥氏体化温度的升高,第二相粒子中Nb和Ti的质量比(Nb/Ti)逐渐减小,1050 ℃保温时晶粒细小且均匀,平均尺寸为41.9 μm;1100 ℃和1150 ℃保温时,晶粒发生异常长大,平均尺寸分别为58.0 μm和64.3 μm;1200 ℃和1250 ℃保温时,晶粒均匀长大,平均尺寸分别达到75.1 μm和81.2 μm;各工艺下的晶粒实际长大方式与Humphreys模型预测结果相同。综合考虑加热过程中奥氏体晶粒尺寸及微合金元素的溶解与析出规律,试验钢的适宜加热温度为1200 ℃左右。

关键词: Nb-Ti微合金化钢, 奥氏体晶粒尺寸, Humphreys模型, 第二相

Abstract: Isothermal austenitizing heat treatment tests were conducted on the Nb-Ti microalloyed steel at temperatures ranging from 1050 ℃ to 1250 ℃ for durations from 5 min to 240 min. The austenite grain growth behavior under different heating processes was investigated. Thermo-calc and TEM were employed to analyze the precipitation rules of the second-phase particles under various heating processes, and the grain growth mode was predicted according to the Humphreys model. The results show that with the increase of the austenitizing temperature and the extension of the heating time, the grain size gradually increases. When the heating time is 60 min, the grain size at each temperature no longer changes significantly, and the growth trend gradually slows down. When the heating time is 60 min, with the rise of the austenitizing temperature, the mass ratio of Nb to Ti (Nb/Ti) in the second-phase particles gradually decreases. When heating at 1050 ℃, the grains are fine and uniform, with an average size of 41.9 μm. When heating at 1100 ℃ and 1150 ℃, abnormal grain growth occurs, with average sizes of 58.0 μm and 64.3 μm respectively. When heating at 1200 ℃ and 1250 ℃, the grains grow uniformly, with average sizes reaching 75.1 μm and 81.2 μm respectively. The actual grain growth modes under each process are consistent with the prediction results of the Humphreys model. Taking into account the austenite grain size during the heating process and the dissolution and precipitation rules of microalloying elements, the appropriate heating temperature of the tested steel is approximately 1200 ℃.

Key words: Nb-Ti microalloyed steel, austenite grain size, Humphreys model, second phase

中图分类号:

TG142

张建平, 黄健, 徐海健, 庞宗旭, 王勇, 李天怡. 加热工艺对Nb-Ti微合金化钢晶粒长大行为的影响[J]. 金属热处理, 2025, 50(6): 229-234.

Zhang Jianping, Huang Jian, Xu Haijian, Pang Zongxu, Wang Yong, Li Tianyi. Effect of heating process on grain growth behavior of Nb-Ti microalloyed steel[J]. Heat Treatment of Metals, 2025, 50(6): 229-234.

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加热工艺对Nb-Ti微合金化钢晶粒长大行为的影响

Effect of heating process on grain growth behavior of Nb-Ti microalloyed steel

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