ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2019, Vol. 40 ›› Issue (3): 46-48.

• 组织和性能 • 上一篇    下一篇

淬火温度对780 MPa级Ti-Nb-B微合金化水电用钢组织和力学性能的影响

赵燕青1,孙 力1, 梁爱国1,田志强1,陈振业1,罗应明2,杨 浩1   

  1. 1河钢集团钢研总院,石家庄050023;
    2河钢集团舞钢公司,平顶山462500
  • 收稿日期:2018-11-16 出版日期:2019-06-01 发布日期:2022-05-17
  • 作者简介:赵燕青(1984-),男,硕士(2011年北京科技大学),工程师, 2008年河北工业大学(本科)毕业,轧钢工艺及金属热处理 研究。

Effect of Quenching Temperature on Microstructure and Mechanical Properties of 780 MPa Grade Ti-Nb-B Microalloying Hydroelectric Steel

Zhao Yanqing1, Sun Li1, Liang Aiguo1, Tian Zhiqiang1, Chen Zhenye1, Luo Yingming2 , Yang Hao1   

  1. 1 Hesteel Group Technology Research Institute, Shijiazhuang 050023 ;
    2 Hesteel Group Wusteel Company, Pingdingshan 462500
  • Received:2018-11-16 Published:2019-06-01 Online:2022-05-17

摘要: 研究了淬火温度对780 MPa级水电用钢(/%:0.09C,0.10Si,1.50Mn,0.009P,0.002S,0.90Cr,0.20Ni,0.023Ti,0.004Nb,0.001 0B)组织和力学性能的影响。结果表明,试验钢不同温度淬火后均得到了板条贝氏体组织,随着淬火温度910℃升高至950℃,奥氏体平均晶粒从9.1μm长大到16.6μm,试验钢回火后基本保持了淬火态的板条结构。淬火温度在910~950℃试验钢的强度随着淬火温度的升高先增大后减小,并在930℃时达到最大,试验钢冲击韧性和断后延伸率与强度有着相同的变化规律。在930℃淬火,610℃回火的工艺参数条件下,获得最佳的力学性能:屈服强度为802 MPa,抗拉强度为858 MPa,伸长率为19%,-40℃冲击功为238 J。

关键词: Ti-Nb-B微合金化, 淬火温度, 水电用钢, 组织, 力学性能

Abstract: The effect of quenching temperatures on microstructure and mechanical properties of 780 MPa grade hydroelectric steel(/% :0. 09C,0. 10Si,l.50Mn,0.009P,0.002S,0. 90Cr,0.20Ni,0.023Ti,0.004Nb,0.0010B) was investigated. The results showed that the tested steel can transform into lath bainite microstructure when the steel was quenched at different temperatures, and the average grain size of prior austenite grows from 9.1 μm to 16.6 μm with increasing quenching temperature from 910 °C to 950°C , the microstructure of the tested steel after tempering is basically maintained a lath structure after quenching. When the quenching temperature is between 910 °C and 950°C ,with increasing quenching temperature ,the strength of the tested steel increases firstly then decreases and the maximum value reaches at 930 °C ,and variation of the impact toughness and elongation of tested steel are identical compared with the strength. The optimum mechanical properties are obtained when quenching at 930°C. and tempering at 610 °C , the yield strength is 802 MPa, tensile strength 858 MPa and elongation 19% with the Charpy impact energy 238 J at -40 °C .