金属热处理 ›› 2021, Vol. 46 ›› Issue (6): 209-212.DOI: 10.13251/j.issn.0254-6051.2021.06.041

• 组织与性能 • 上一篇    下一篇

高扩孔钢的连续冷却转变

孙岩, 安治国, 宋月   

  1. 河钢集团钢研总院, 河北 石家庄 052165
  • 收稿日期:2021-01-15 出版日期:2021-06-25 发布日期:2021-07-21
  • 通讯作者: 安治国,高级工程师,E-mail:anzhiguo@hbisco.com
  • 作者简介:孙 岩(1991—),女,硕士,主要研究方向为钢的质量控制及性能,E-mail:yanyansun00@163.com。

Continuous cooling transformation of a high grade reaming steel

Sun Yan, An Zhiguo, Song Yue   

  1. Steel Research Institute, Hesteel Group, Shijiazhuang Hebei 052165, China
  • Received:2021-01-15 Online:2021-06-25 Published:2021-07-21

摘要: 将DIL805L淬火相变膨胀仪与金相分析手段相结合,绘制了一种高扩孔钢的连续冷却转变曲线。结果表明,冷速在0.5~1 ℃/s时,室温组织是铁素体+珠光体;冷速超过2 ℃/s,开始出现贝氏体;冷速超过25 ℃/s时,铁素体消失;冷速大于40 ℃/s时,马氏体出现。另外,Si、Mn的配合有助于粒状贝氏体组织的形成,微合金元素Ti与N结合可细化晶粒,间接提高成形性能。

关键词: 高扩孔钢, 微观组织, CCT曲线, 合金元素

Abstract: Continuous cooling transformation curves of a high grade reaming steel were obtained by using a DIL805L thermal dilatometer combining with metallographic analysis. The results show that the microstructure of the steel with the cooling rate of 0.5-1 ℃/s is ferrite and pearlite at room temperature. Bainite appears with cooling rate exceeding 2 ℃/s, ferrite disappears with cooling rate greater than 25 ℃/s and martensite appears with cooling rate greater than 40 ℃/s. Besides, Si and Mn are cooperatively conducive to the formation of granular bainite structure. The combination of microalloy element Ti and N can refine the grains and indirectly improve the forming performance.

Key words: high grade reaming steel, microstructure, CCT curves, alloy element

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