Ti微合金化对25Cr3Mo3NiNbZr钢碳化物析出行为和高温强度的影响

doi:10.13251/j.issn.0254-6051.2023.11.005

金属热处理 ›› 2023, Vol. 48 ›› Issue (11): 29-37.DOI: 10.13251/j.issn.0254-6051.2023.11.005

Ti微合金化对25Cr3Mo3NiNbZr钢碳化物析出行为和高温强度的影响

卢茂勇^1,2, 徐乐², 李浩³, 梁恩溥², 李若浩², 吴润¹

1.武汉科技大学材料与冶金学院, 湖北武汉 430081;
2.钢铁研究总院有限公司特殊钢研究院, 北京 100081;
3.重庆长安望江工业集团有限公司, 重庆 400020

收稿日期:2023-06-20 修回日期:2023-08-31 出版日期:2023-11-25 发布日期:2023-12-27
通讯作者: 徐乐,正高级工程师,博士,E-mail:xule@nercast.com
作者简介:卢茂勇(1996—),男,硕士,主要研究方向为高强马氏体钢强韧化,E-mail:lumaoyong7@163.com。
基金资助:
农机装备材料生产应用示范平台项目(TC200H01X/05)

Effect of Ti microalloying on carbide precipitation behavior and high temperature strength of 25Cr3Mo3NiNbZr steel

Lu Maoyong^1,2, Xu Le², Li Hao³, Liang Enpu², Li Ruohao², Wu Run¹

1. School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan Hubei 430081, China;
2. Research Institute of Special Steels, Central Iron and Steel Research Institute Company Limited, Beijing 100081, China;
3. Chongqing Chang'an Wangjiang Industrial Group Co., Ltd., Chongqing 400020, China

Received:2023-06-20 Revised:2023-08-31 Online:2023-11-25 Published:2023-12-27

摘要/Abstract

摘要： 利用光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)、Thermo-Calc热力学计算、物理化学相分析和高温(700 ℃)拉伸试验,研究了Ti微合金化对25Cr3Mo3NiNbZr钢碳化物析出行为、微观组织和高温强度的影响。结果表明,由于添加了微合金化元素Ti,试验钢的原奥氏体晶粒由50 μm细化至20 μm,高温(700 ℃)抗拉强度提升176 MPa,高温屈服强度提升54 MPa。钢中MC型碳化物析出量明显增多,数密度由4.36×10¹⁵ m^-3提升至5.34×10¹⁹ m^-3,且5~10 nm的MC型碳化物占比由81.8%提升至90.1%,同时增加了1~5 nm的MC析出相。此外,Ti元素的添加提高了MC型碳化物的热稳定性,粗化速率由0.301 978 nm·s^-1/3降低到0.169 049 nm·s^-1/3。添加Ti元素后,试验钢中的MC型碳化物更细小,分布更密集,热稳定性更好,是试验钢高温强度提高的主要原因。

关键词: Ti微合金化, 高温强度, 碳化物, 析出行为, 热稳定性

Abstract: Effect of Ti microalloying on carbide precipitation behavior, microstructure and high temperature strength of the 25Cr3Mo3NiNbZr steel was investigated by means of optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM), Thermo-Calc thermodynamic calculation, physicochemical phase analysis and high temperature (700 ℃) tensile test. The results show that due to the micro-addition of Ti, the prior austenite grain size of the tested steel is refined from 50 μm to 20 μm, the high temperature (700 ℃) tensile strength and yield strength are increased by 176 MPa and 54 MPa. After the addition of Ti, the number density of MC-type carbide in the steel increases from 4.36×10¹⁵ m^-3 to 5.34×10¹⁹ m^-3, and the proportion of MC-type carbide in the size of 5-10 nm increases from 81.8% to 90.1%, and the MC-type carbide in the size range of 1-5 nm also increases. In addition, due to the addition of Ti, the thermal stability of MC carbides is improved, and the coarsening rate is reduced from 0.301 978 nm·s^-1/3 to 0.169 049 nm·s^-1/3. The addition of Ti makes the MC-type carbide in the tested steel smaller in size, denser and more stable, which is the main reason for the improvement of the high temperature strength of the tested steel.

Key words: Ti microalloying, high temperature strength, carbide, precipitation behavior, thermal stability

中图分类号:

TG142

卢茂勇, 徐乐, 李浩, 梁恩溥, 李若浩, 吴润. Ti微合金化对25Cr3Mo3NiNbZr钢碳化物析出行为和高温强度的影响[J]. 金属热处理, 2023, 48(11): 29-37.

Lu Maoyong, Xu Le, Li Hao, Liang Enpu, Li Ruohao, Wu Run. Effect of Ti microalloying on carbide precipitation behavior and high temperature strength of 25Cr3Mo3NiNbZr steel[J]. Heat Treatment of Metals, 2023, 48(11): 29-37.

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Ti微合金化对25Cr3Mo3NiNbZr钢碳化物析出行为和高温强度的影响

Effect of Ti microalloying on carbide precipitation behavior and high temperature strength of 25Cr3Mo3NiNbZr steel

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