金属热处理 ›› 2022, Vol. 47 ›› Issue (9): 220-226.DOI: 10.13251/j.issn.0254-6051.2022.09.038

• 组织与性能 • 上一篇    下一篇

280VK冷轧高强钢退火过程的组织演变及析出机理

谯德高1, 罗晓阳1, 胡双喜2, 侯园园2, 张志坚2, 唐兴昌3   

  1. 1.酒泉钢铁集团有限责任公司 碳钢薄板厂, 甘肃 嘉峪关 735100;
    2.兰州理工大学 材料科学与工程学院, 甘肃 兰州 730050;
    3.兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室, 甘肃 兰州 730050
  • 收稿日期:2022-04-19 修回日期:2022-08-08 发布日期:2022-10-18
  • 通讯作者: 唐兴昌,副研究员,博士,E-mail:tangxingchanglut@163.com
  • 作者简介:谯德高(1983—),男,高级工程师,学士,主要研究方向为连铸工艺技术及组织性能调控,E-mail:qiaodegao@jiugang.com。
  • 基金资助:
    国家自然科学基金(52061022)

Microstructure evolution of 280VK cold-rolled high-strength steel and precipitation mechanism during annealing process

Qiao Degao1, Luo Xiaoyang1, Hu Shuangxi2, Hou Yuanyuan2, Zhang Zhijian2, Tang Xingchang3   

  1. 1. Carbon Steel Sheet Factory, Jiuquan Iron and steel (Group) Co. , Ltd. , Jiayuguan Gansu, 735100, China;
    2. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou Gansu 730050, China;
    3. Sate Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou Gansu 730050, China
  • Received:2022-04-19 Revised:2022-08-08 Published:2022-10-18

摘要: 对热轧态280VK微合金高强钢经冷轧后取样,在不同温度下进行退火处理。对退火试样组织进行SEM、TEM、EBSD观察,以及析出物含量测定和力学性能测试分析,揭示退火工艺对冷轧高强钢组织结构、织构演变和力学性能的影响。结果表明,试验钢经退火处理后,基体中产生大量TiC析出粒子;随着退火温度升高,基体晶粒度减小,析出粒子尺寸增大但数量减少,屈服强度、抗拉强度降低,伸长率升高。热力学计算表明,试验钢中析出相的优先级顺序为TiN>AlN>TiC,析出相以TiC为主。

关键词: 280VK冷轧高强钢, 退火工艺, 显微组织, 力学性能, 析出机理

Abstract: In order to reveal the effect of annealing process on microstructure, texture evolution and mechanical properties, the hot-rolled microalloyed high-strength steel 280VK was cold-rolled and then annealed at different temperatures, then the microstructure was observed by SEM, TEM and EBSD, meanwhile the content of precipitates and mechanical properties were measured and analyzed. The results show that after annealing, a large number of TiC precipitated particles are generated in the matrix of the tested steel. As the annealing temperature increases, the grain size increases, the average size of precipitated particles increases but the number decreases, the tensile strength and yield strength decrease, while the elongation increases. Thermodynamic calculation shows that the priority order of the precipitates in the tested steel is TiN>AlN>TiC, and TiC is the main one.

Key words: 280VK cold-rolled high-strength steel, annealing process, microstructure, mechanical properties, precipitation mechanism

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