金属热处理 ›› 2021, Vol. 46 ›› Issue (3): 146-152.DOI: 10.13251/j.issn.0254-6051.2021.03.030

• 组织与性能 • 上一篇    下一篇

均热温度对Ti-V复合微合金钢组织演变和硬度的影响

倪玲玲1, 付锡彬1,2, 张可1, 赵时雨1, 任武彬1, 李昭东2, 李景辉1, 张明亚1   

  1. 1.安徽工业大学 冶金工程学院, 安徽 马鞍山 243032;
    2.钢铁研究总院 工程用钢所, 北京 100081
  • 收稿日期:2020-11-15 出版日期:2021-03-25 发布日期:2021-05-08
  • 通讯作者: 张可,讲师,博士,E-mail:huzhude@yeah.net
  • 作者简介:倪玲玲(1999—),女,主要研究方向为先进钢铁材料,E-mail:1523413708@qq.com。
  • 基金资助:
    国家重点研发计划(2017YFB0304700,2017YFB0305100);国家自然科学基金(51704008);钒钛资源综合利用国家重点实验室开放基金(18100009);国家重点基础研究计划(2015CB654803)

Effect of soaking temperature on microstructure evolution and hardness ofTi-V complex microalloyed steel

Ni Lingling1, Fu Xibin1,2, Zhang Ke1, Zhao Shiyu1, Ren Wubin1, Li Zhaodong2, Li Jinghui1, Zhang Mingya1   

  1. 1. School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan Anhui 243032, China;
    2. Institute of Structural Steels, Iron and Steel Research Institute, Beijing 100081, China
  • Received:2020-11-15 Online:2021-03-25 Published:2021-05-08

摘要: 利用OM、SEM、Vickers硬度计等手段研究了均热温度对Ti-V复合微合金钢组织转变及硬度的影响,并阐明了组织演变和硬度变化的原因。结果表明,Ti-V钢不同均热温度淬火后组织均为马氏体。随着均热温度由1000 ℃升至1250 ℃,Ti-V钢的硬度由333 HV降低到212 HV,原始奥氏体晶粒尺寸由52 μm升至209 μm。全固溶温度以上时,仍存在少量TiN粒子,且随温度升高逐渐溶解,其对晶界的钉扎作用是阻止晶粒长大的主要因素。Ti-V钢原始奥氏体尺寸对硬度的影响随其尺寸的增大逐渐减小,均热温度应选择1220 ℃以下,以避免粗大晶粒。

关键词: Ti-V复合微合金钢, 均热温度, 组织, 硬度

Abstract: Effect of soaking temperature on microstructure transformation and hardness of Ti-V microalloyed steel was investigated by means of OM, SEM and Vickers hardness tester. The reasons for microstructure evolution and hardness change were also clarified. The results show that the microstructure of Ti-V steel with different soaking temperatures is all martensite. As the soaking temperature rises from 1000 ℃ to 1250 ℃, the quenchened hardness of Ti-V steel decreases from 333 HV to 212 HV, and the prior austenite grain size increases from 52 μm to 209 μm. Above the total solution temperature, a small amount of TiN particles still exist and gradually dissolve with increasing of temperature. The pinning effect of the TiN on the grain boundaries is the main factor preventing the growth of grains. The influence of prior austenite size on the hardness of Ti-V steel gradually decreases with the increase of its size. Therefore, the soaking temperature should be below 1220 ℃ to avoid coarse grains.

Key words: Ti-V complex microalloyed steel, soaking temperature, microstructure, hardness

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