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钙镁复合变质剂对冷轧高强钢组织遗传性及塑性影响

李媛媛 甄维静 李永亮 闫志杰

李媛媛, 甄维静, 李永亮, 闫志杰. 钙镁复合变质剂对冷轧高强钢组织遗传性及塑性影响[J]. 钢铁钒钛, 2021, 42(1): 119-125. doi: 10.7513/j.issn.1004-7638.2021.01.019
引用本文: 李媛媛, 甄维静, 李永亮, 闫志杰. 钙镁复合变质剂对冷轧高强钢组织遗传性及塑性影响[J]. 钢铁钒钛, 2021, 42(1): 119-125. doi: 10.7513/j.issn.1004-7638.2021.01.019
Li Yuanyuan, Zhen Weijing, Li Yongliang, Yan Zhijie. Effect of Ca-Mg compound modifier on microstructure and plasicity in cold-rolled high strength steel[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(1): 119-125. doi: 10.7513/j.issn.1004-7638.2021.01.019
Citation: Li Yuanyuan, Zhen Weijing, Li Yongliang, Yan Zhijie. Effect of Ca-Mg compound modifier on microstructure and plasicity in cold-rolled high strength steel[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(1): 119-125. doi: 10.7513/j.issn.1004-7638.2021.01.019

钙镁复合变质剂对冷轧高强钢组织遗传性及塑性影响

doi: 10.7513/j.issn.1004-7638.2021.01.019
基金项目: 中央引导地方科技发展专项资金项目(YDZX20191400004587)
详细信息
    作者简介:

    李媛媛(1985—),女,河北唐山人,本科,讲师,主要从事材料加工研究,电话:17703253939,E-mail:417171680@qq.com

    通讯作者:

    甄维静(1982—),女,河北唐山人,本科,讲师,主要从事钢的强化机理研究,电话:15369528838,E-mail:672535311@qq.com

  • 中图分类号: TF76

Effect of Ca-Mg compound modifier on microstructure and plasicity in cold-rolled high strength steel

  • 摘要: 利用光学显微镜(OM)、透射电镜(TEM)和电子背散射衍射(EBSD)等设备研究了Ca-Mg复合变质剂对冷轧超高强钢铸坯中TiN粒子析出的影响机制,并对显微组织在各工序的遗传性及塑性改善进行了系统对比。结果发现:添加变质剂以后,铸坯中TiN第二相粒子尺寸明显变小,数量增多,分布更弥散;添加改质剂后钢坯、热轧钢板中沿晶界铁素体减少,冷轧退火后显微组织变细;与未添加变质剂试验钢比,屈服强度和屈强比提高,材料折弯、扩孔率得到改善。变质剂的添加改变了钢液中TiN形核机制。弥散的TiN可以细化铸态组织,并通过遗传效应对热轧、冷轧连退组织产生影响,改善力学性能和成型性能。
  • 图  1  试验钢冷轧后的退火工艺

    Figure  1.  Heat treatment process for as cold-rolled experimental steels

    图  2  铸坯中第二相粒子形貌和化学成分

    Figure  2.  Morphology and chemical compositions of secondary particle in casting ingot

    图  3  变质剂对带钢显微组织的影响

    Figure  3.  Effect of modifier on microstructure of strip steel

    图  4  冷板晶粒取向成像及有效晶粒尺寸

    Figure  4.  Crystal orientation mapping (COM) and effective grain size of cold rolled sheet

    图  5  平衡态TiN析出行为

    Figure  5.  Precipitating behavior of TiN under equilibrium condition

    图  6  TiN析出示意

    Figure  6.  Schematic of TiN precipitation

    表  1  试验钢的主要化学成分

    Table  1.   Main chemical compositions of the experimental steels %

    编号CSiMnSPNb+Ti+CrAltN改质剂
    1#≤0.35≤1.50≤2.500.015≤0.030≤0.200≥0.020≤0.007未添加
    2#≤0.35≤1.50≤2.500.015≤0.030≤0.200≥0.020≤0.007添加
    下载: 导出CSV

    表  2  变质剂对试验钢力学性能和成型性能的影响

    Table  2.   Effect of modifier on the mechanical properties and forming performance

    钢号力学性能成型性能
    抗拉强度/MPa屈服强度/MPa屈强比伸长率/%扩孔率/%180°折弯 d=0a
    1#热轧7234900.681325不开裂
    2#热轧7955640.711631不开裂
    1#冷轧9846830.692035开裂
    2#冷轧10007830.7825.555不开裂
    下载: 导出CSV
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  • 收稿日期:  2020-04-08
  • 刊出日期:  2021-02-10

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