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双相钢的铁素体晶粒尺寸控制及其对力学性能和氢扩散性能的影响

叶青

叶青. 双相钢的铁素体晶粒尺寸控制及其对力学性能和氢扩散性能的影响[J]. 钢铁钒钛, 2022, 43(5): 166-170. doi: 10.7513/j.issn.1004-7638.2022.05.024
引用本文: 叶青. 双相钢的铁素体晶粒尺寸控制及其对力学性能和氢扩散性能的影响[J]. 钢铁钒钛, 2022, 43(5): 166-170. doi: 10.7513/j.issn.1004-7638.2022.05.024
Ye Qing. Ferrite grain size control of dual phase steel and its effect on mechanical properties and hydrogen diffusion properties[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(5): 166-170. doi: 10.7513/j.issn.1004-7638.2022.05.024
Citation: Ye Qing. Ferrite grain size control of dual phase steel and its effect on mechanical properties and hydrogen diffusion properties[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(5): 166-170. doi: 10.7513/j.issn.1004-7638.2022.05.024

双相钢的铁素体晶粒尺寸控制及其对力学性能和氢扩散性能的影响

doi: 10.7513/j.issn.1004-7638.2022.05.024
详细信息
    作者简介:

    叶青,1981年出生,女,汉族,广西鹿寨人,硕士研究生,讲师,长期从事先进金属材料热处理控轧控冷工艺优化方面的研究,E-mail:leaf-lzzy@qq.com

  • 中图分类号: TG142.1

Ferrite grain size control of dual phase steel and its effect on mechanical properties and hydrogen diffusion properties

  • 摘要: 通过920 ℃两相区奥氏体化3 min+形变热处理的热模拟工艺制备了三种不同马氏体晶粒尺寸的铁素体-马氏体双相钢,利用扫描电子显微镜、透射电子显微镜和拉伸试验对三种不同铁素体晶粒度的铁素体-马氏体双相钢的显微组织和力学性进行了表征,利用氢渗透试验对其氢扩散行为进行研究。结果表明:在同一马氏体含量水平(约30%)下,随着双相钢铁素体晶粒尺寸由11.6 μm下降至2.3 μm和1.1 μm,铁素体-马氏体材料的屈服强度和抗拉强度显著增大,其中抗拉强度由865 MPa增大至965 MPa和1 030 MPa,但三者材料的屈强比和延伸率变化不大。随着铁素体晶粒的细化,马氏体带被铁素体隔离,有效增强马氏体可塑性的同时,减缓了氢在试验钢中的扩散,氢扩散系数由3.91×10−12 m2/s下降为2.71×10−12 m2/s和9.80×10−13 m2/s。
  • 图  1  三种不同的热模拟工艺

    Figure  1.  Three different thermal simulation processes

    图  2  三种不同热模拟工艺对应的显微组织

    Figure  2.  The microstructures of samples by three different thermal simulation processes

    图  3  真应变的应变硬化率与晶粒尺寸之间的关系

    Figure  3.  Relationship between strain hardening rate and grain size of true strain

    图  4  三种热模拟工艺下试验钢的断口形貌

    Figure  4.  Fractography of test steel by three thermal simulation processes

    图  5  断口侧面形貌观察

    Figure  5.  Fracture profile

    图  6  不同晶粒尺寸试样钢的氢渗透曲线

    Figure  6.  Hydrogen permeation curves of the samples with different grain size

    表  1  试样的主要化学成分

    Table  1.   Main chemical components of sample %

    CMnSiAlNPS
    0.161.450.200.030.0030.0010.003
    下载: 导出CSV

    表  2  三种热模拟工艺下的显微组织和力学性能参数

    Table  2.   Microstructure and mechanical properties of samples by three thermal simulation process

    编号马氏体含量/%铁素体晶粒尺寸
    /μm
    抗拉强度/MPa屈服强度/MPa延伸率/%断面收缩率/%屈强比
    工艺131.211.68654357.513.20.502
    工艺230.72.39654848.017.60.501
    工艺329.91.110305157.315.30.500
    下载: 导出CSV

    表  3  电化学氢渗透试验参数

    Table  3.   Parameters of electrochemical hydrogen permeation

    试样编号工艺电流密度/
    (mA·cm−2
    厚度/
    mm
    面积/
    mm2
    JL×1012/
    (mol·cm−1·s−1)
    氢扩散系数/
    (m2·s−1)
    C0×106/
    (mol·cm−3)
    1#工艺110.015×59.323.91×10−1215.77
    2#工艺210.015×58.762.17×10−1218.83
    3#工艺310.015×57.469.80×10−1323.48
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-07-26
  • 刊出日期:  2022-11-01

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