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退火温度对钒微合金化780 MPa级冷轧双相钢组织性能的影响

余灿生 张龙超 郑之旺 龚慧 张达富

余灿生, 张龙超, 郑之旺, 龚慧, 张达富. 退火温度对钒微合金化780 MPa级冷轧双相钢组织性能的影响[J]. 钢铁钒钛, 2021, 42(5): 158-163. doi: 10.7513/j.issn.1004-7638.2021.05.024
引用本文: 余灿生, 张龙超, 郑之旺, 龚慧, 张达富. 退火温度对钒微合金化780 MPa级冷轧双相钢组织性能的影响[J]. 钢铁钒钛, 2021, 42(5): 158-163. doi: 10.7513/j.issn.1004-7638.2021.05.024
Yu Cansheng, Zhang Longchao, Zheng Zhiwang, Gong Hui, Zhang Dafu. Effect of annealing temperature on microstructure and mechanical properties of vanadium microalloyed 780 MPa cold rolled dual phase steel[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(5): 158-163. doi: 10.7513/j.issn.1004-7638.2021.05.024
Citation: Yu Cansheng, Zhang Longchao, Zheng Zhiwang, Gong Hui, Zhang Dafu. Effect of annealing temperature on microstructure and mechanical properties of vanadium microalloyed 780 MPa cold rolled dual phase steel[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(5): 158-163. doi: 10.7513/j.issn.1004-7638.2021.05.024

退火温度对钒微合金化780 MPa级冷轧双相钢组织性能的影响

doi: 10.7513/j.issn.1004-7638.2021.05.024
基金项目: 四川省凉山州政府基金项目(20ZDYF0125)
详细信息
    作者简介:

    余灿生(1985—),男,云南大理人,硕士,高级工程师,主要研究方向:金属材料、冷轧高强汽车板,E-mail:yucansheng1985@163.com。

  • 中图分类号: TF841.3,TG142

Effect of annealing temperature on microstructure and mechanical properties of vanadium microalloyed 780 MPa cold rolled dual phase steel

  • 摘要: 将钒微合金化试验钢分别加热至780、800、820 ℃和840 ℃保温一段时间后,依次经过缓慢冷却、快速冷却、模拟镀锌后,空冷至室温。研究结果表明,780 ℃退火时微观组织均匀性较差且发现未溶解的碳化物,导致强度和塑性均不佳。随着退火温度的升高,铁素体尺寸及分数逐渐降低,中低温转变产物含量逐步增加且其尺寸有所粗化。当退火温度为800 ℃时,马氏体含量达到最大,当退火温度进一步升高时,马氏体含量有所降低,而贝氏体含量则有所增加,导致抗拉强度在800~840 ℃范围内变化不大,而延伸率先升高后降低。当退火温度为820 ℃ 时,带钢获得较佳的力学性能,屈服强度、抗拉强度、屈强比、断后伸长率A80和扩孔率分别为486 MPa、835 MPa、0.58、16.0%和27%。
  • 图  1  冷轧双相钢退火工艺

    Figure  1.  Annealing process of cold rolled dual-phase steel

    图  2  不同退火温度下试验钢的微观组织形貌

    Figure  2.  Microstructure of tested steel after simulated annealing process at different soaking temperatures

    (a)(e) 780 ℃; (b)(f) 800 ℃; (c)(g) 820 ℃; (d)(h) 840 ℃

    图  3  试验钢退火工艺及相变过程示意

    Figure  3.  Schematic diagram of phase transformation process during annealing of tested steel

    图  4  力学性能随退火温度的变化情况

    Figure  4.  Changes of mechanical properties of tested steel with annealing temperature

    表  1  试验钢主要化学成分

    Table  1.   Main chemical compositions of experimental steel %

    CSiMnPSAlsCrMoV
    0.0870.251.820.00650.00200.047添加添加添加
    下载: 导出CSV

    表  2  不同退火温度下试验钢的微观组织及相比例

    Table  2.   Microstructure and phase ratio of tested steel after simulated annealing process at soaking temperature comparison

    退火温度/℃微观组织铁素体平均晶粒尺寸/μmM分数/%B分数/%
    780F+M+碳化物6300
    800F+M+B微量4.537微量(≤3)
    820F+M+B4358
    840F+M+B33312
    下载: 导出CSV

    表  3  固溶C原子在铁素体中的扩散系数和质量分数

    Table  3.   Diffusion coefficient and mass fraction of solid solution C atom in ferrite

    退火温度/ ℃扩散系数×107 /(cm2·s−1w(C)/%
    铁素体中奥氏体中
    7804.520.030.89
    8005.720.040.96
    8207.360.051.00
    8408.490.061.37
    下载: 导出CSV

    表  4  扩孔试验孔径测试及扩孔率

    Table  4.   Test of the hole diameter of the hole expansion experiment and the hole expansion rate

    退火温度/℃扩孔前直径
    /mm
    破裂后圆孔直径/mm扩孔率/%
    测试值均值
    78010.0012.2812.3012.2812.2923
    80010.0012.5012.5212.512.5125
    82010.0012.7012.6912.7112.7027
    84010.0012.9012.9012.9212.9129
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-08-11
  • 刊出日期:  2021-10-30

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