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首页> 外文期刊>ISIJ international >Effect of Deformation on Microcrack Depth in Hot Press Formed Part with Galvanized Steel Sheet
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Effect of Deformation on Microcrack Depth in Hot Press Formed Part with Galvanized Steel Sheet

机译：变形对镀锌钢板热压成型件微裂纹深度的影响

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摘要

Surface cracks or microcracks have been reported as one source of fatigue life deterioration. Propagation of microcracks into the steel substrate may appear on a deformed part when zinc-coated steels are used for direct hot press forming. This work investigated crack occurrence in galvanized steel sheets with coupled thermo-mechanical finite element simulations and realistic HPF experiments. This study used a two-dimensional hat-shaped tool called Conventional-Forming to effectively feature a cross-section of hot press formed parts in a vehicle. Microcracks occurred on the product wall-outside when the Conventional-Forming die moved vertically and the tool contacted the material. The depth of microcracks in the deformed zone where compressive-bending and unbending followed by a straightening occur is highly dependent on the magnitude of effective strain. Therefore, it is presumed that smaller magnitudes of effective strain from forming can reduce the microcrack depth on the workpiece. To identify ways to lower the effective strain, the study focused on the tool contact and bending curvature of the workpiece during forming. Consequently, Side-Forming, in which a material undergoes deformation behavior from a die entering from an oblique direction, was proposed. With other conditions unchanged, the numerical calculations and experimental results indicated a lowered effective strain and a subsequent significant reduction in microcrack depth. Moreover, the required qualities for hot formed products such as hardness and shape accuracy could be also achieved.
机译：据报道，表面裂纹或微裂纹是疲劳寿命恶化的一种原因。当镀锌钢用于直接热压成型时，微裂纹向钢基材的传播可能会出现在变形的零件上。这项工作通过热机械有限元模拟和现实的HPF实验研究了镀锌钢板中的裂纹发生情况。这项研究使用了二维帽形工具，称为“传统成型”，可以有效地描绘出车辆中热压成型零件的横截面。当常规成型模具垂直移动且工具接触材料时，产品壁外会发生微裂纹。在发生压缩弯曲和未弯曲然后再拉直的变形区域中的微裂纹深度高度取决于有效应变的大小。因此，可以认为，较小的有效应变形成量可以减小工件上的微裂纹深度。为了确定降低有效应变的方法，该研究集中在成形过程中的工具接触和工件的弯曲曲率上。因此，提出了侧向成型，其中材料从从倾斜方向进入的模具经历变形行为。在其他条件不变的情况下，数值计算和实验结果表明有效应变降低，随后微裂纹深度显着减小。而且，还可以实现热成型产品的所需质量，例如硬度和形状精度。

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  • 来源
    《ISIJ international》 |2019年第7期|1295-1303|共9页
  • 作者

    Jong Won CHOI; Kyung Seok OH; Hong Gee KIM; Dong Jin KIM;

  • 作者单位

    Materials Forming Research Group, POSCO, 100 Songdogwahak-ro, Yeonsu-gu, Incheon, 21985 Republic of Korea;

    Materials Forming Research Group, POSCO, 100 Songdogwahak-ro, Yeonsu-gu, Incheon, 21985 Republic of Korea;

    Materials Forming Research Group, POSCO, 100 Songdogwahak-ro, Yeonsu-gu, Incheon, 21985 Republic of Korea;

    Materials Forming Research Group, POSCO, 100 Songdogwahak-ro, Yeonsu-gu, Incheon, 21985 Republic of Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    microcrack; galvanized steel; Side-Forming; hot press forming;

    机译：微裂纹镀锌钢侧面成型;热压成型;

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