金属热处理 ›› 2024, Vol. 49 ›› Issue (8): 15-21.DOI: 10.13251/j.issn.0254-6051.2024.08.003

• 材料研究 • 上一篇    下一篇

HRB400E钢等温热处理过程中的奥氏体晶粒长大和钒析出物的影响

陈石1, 汪家晗1, 张云祥1, 骆艳萍2, 孙钊洋1, 叶传龙1   

  1. 1.武汉科技大学 材料学部, 湖北 武汉 430081;
    2.中冶南方工程技术有限公司, 湖北 武汉 430223
  • 收稿日期:2024-01-28 修回日期:2024-06-12 出版日期:2024-08-25 发布日期:2024-09-27
  • 通讯作者: 张云祥,副教授,博士,E-mail:zhangyunxiang@wust.edu.cn
  • 作者简介:陈 石(1994—),男,硕士研究生,主要研究方向为金属材料组织与性能控制,E-mail:1479433434@qq.com。
  • 基金资助:
    国家自然科学基金(51774219)

Austenite grain growth of HRB400E steel during isothermal treatment and effect of vanadium precipitates

Chen Shi1, Wang Jiahan1, Zhang Yunxiang1, Luo Yanping2, Sun Zhaoyang1, Ye Chuanlong1   

  1. 1. Materials Department of Wuhan University of Science and Technology, Wuhan Hubei 430081, China;
    2. MCC Southern Engineering Technology Corporation, Wuhan Hubei 430223, China
  • Received:2024-01-28 Revised:2024-06-12 Online:2024-08-25 Published:2024-09-27

摘要: 利用高温激光扫描共聚焦显微镜和透射电镜(TEM)等研究了含钒钢HRB400E在不同等温温度(950~1200 ℃)下保温30 min的加热过程中的奥氏体晶粒长大行为以及钒析出物对奥氏体晶粒长大的影响。结果表明,加热温度对试验钢奥氏体晶粒长大的影响明显大于保温时间,加热温度超过1100 ℃时,奥氏体晶粒等温长大速率明显加大。TEM观察表明钢中奥氏体晶粒长大行为受基体中V(C, N)粒子的影响,当加热温度为950 ℃时,钢中存在大量未溶的V(C, N)粒子,能有效钉扎奥氏体晶界,晶粒长大缓慢;当加热温度升高至1100 ℃时,随保温时间延长,细小的V(C, N)粒子溶解和粗化,钉扎效果下降,此时奥氏体晶粒快速长大。根据实测奥氏体晶粒尺寸结合Sellars模型和Anelli模型建立了试验钢奥氏体晶粒等温长大动力学模型,模型计算值与实测值吻合较好。

关键词: 抗震钢HRB400E, 奥氏体晶粒长大, 动力学模型, V(C, N)析出物

Abstract: Austenite grain growth behavior during the isothermal heating processes at different heating temperatures(950-1200 ℃) holding for 30 min of vanadium containing steel HRB400E and the effect of vanadium precipitates on the austenite grain growth was studied by using high-temperature laser scanning confocal microscope and transmission electron microscope(TEM). The results show that the effect of heating temperature on the austenite grain growth in the tested steel is significantly greater than that of the holding time, and the isothermal growth rate of austenite grains increases significantly when the heating temperature exceeds 1100 ℃. The TEM observation shows that the growth behavior of austenite grains in the steel is influenced by V(C, N) particles in the matrix. When the heating temperature is 950 ℃, there is a large amount of undissolved V(C, N) particles in the steel, which can effectively pin the austenite grain boundaries and slow the grain growth. When the heating temperature rises to 1100 ℃, the fine V(C, N) particles dissolve and coarsen with the prolongation of the holding time, the pinning effect decreases, at this time the austenite grains grow rapidly. A kinetic model for the isothermal growth of austenite grains in the tested steel is established based on the measured austenite grain size and combined with the Sellers model and Anelli model, and it is found that the calculated values of the model are in good agreement with the measured values.

Key words: seismic steel HRB400E, austenite grain growth, kinetic model, V(C,N) precipitate

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