金属热处理 ›› 2021, Vol. 46 ›› Issue (4): 122-125.DOI: 10.13251/j.issn.0254-6051.2021.04.021

• 工艺研究 • 上一篇    下一篇

亚温淬火对09MnNiDR容器钢板组织及断裂性能的影响

张丙军1, 谢章龙1, 席连云1, 李志超2, 宁博2   

  1. 1.南京钢铁股份有限公司 板材事业部技术研发处, 江苏 南京 210035;
    2.北京科技大学 钢铁共性技术协同创新中心, 北京 100083
  • 收稿日期:2020-10-12 出版日期:2021-04-25 发布日期:2021-05-08
  • 作者简介:张丙军(1982—),男,工程师,学士,主要研究方向为锅炉和压力容器用钢的生产工艺,E-mail:zhangbingjun@njsteel.com.cn

Effect of intercritical hardening on microstructure and fracture properties of 09MnNiDR vessel steel plate

Zhang Bingjun1, Xie Zhanglong1, Xi Lianyun1, Li Zhichao2, Ning Bo2   

  1. 1. Plate Business Departement, Nanjing Iron & Steel Co.,Ltd., Nanjing Jiangsu 210035, China;
    2. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2020-10-12 Online:2021-04-25 Published:2021-05-08

摘要: 利用光学显微镜、扫描电镜、热膨胀分析仪等对连铸-轧制方式生产的60 mm厚09MnNiDR容器钢板经不同亚温淬火+回火工艺处理后的组织和低温冲击性能进行了分析。结果表明:相比两次亚温淬火+回火工艺,采用淬火+亚温淬火+回火工艺的试验钢1/2厚度处冲击吸收能量大大提高,这与组织中小尺寸晶粒的占比提高有关;前者冲击断口形貌表现为准解理断裂,后者则为韧性断裂。

关键词: 09MnNiDR钢板, 亚温淬火, 贝氏体, 晶粒尺寸, 冲击吸收能量

Abstract: Microstructure and low temperature impact properties of the 09MnNiDR vessel steel plate with the thickness of 60 mm were analyzed by means of metallographic microscope, scanning electron microscope and thermosdilatometer. The results show that the impact absorbed energy at 1/2 thickness of the steel plate under quenching+intercritical hardening+tempering process is greatly improved comparing with that under twice intercritical hardening+tempering process, which is related to the increase of the proportion of small and medium-sized grains in the steel. The impact fracture morphology of the former process is quasi-cleavage fracture, while that of the latter process is ductile fracture.

Key words: 09MnNiDR steel plate, intercritical hardening, bainite, grain size, impact absorbed energy

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