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B1500HS热成形钢与DP钢的点焊接头拉剪性能

孙浩, 刘成杰, 毕文珍, 郭亚洲, 王武荣, 韦习成

孙浩, 刘成杰, 毕文珍, 郭亚洲, 王武荣, 韦习成. B1500HS热成形钢与DP钢的点焊接头拉剪性能[J]. 焊接, 2022, (5). DOI: 10.12073/j.hj.20210624002
引用本文: 孙浩, 刘成杰, 毕文珍, 郭亚洲, 王武荣, 韦习成. B1500HS热成形钢与DP钢的点焊接头拉剪性能[J]. 焊接, 2022, (5). DOI: 10.12073/j.hj.20210624002
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Sun Hao, Liu Chengjie, Bi Wenzheng, Guo Yazhou, Wang Wurong, Wei Xicheng. Tensile-shear properties of resistance spot welded joints of B1500HS hot forming steel[J]. WELDING & JOINING, 2022, (5). DOI: 10.12073/j.hj.20210624002
Citation: Sun Hao, Liu Chengjie, Bi Wenzheng, Guo Yazhou, Wang Wurong, Wei Xicheng. Tensile-shear properties of resistance spot welded joints of B1500HS hot forming steel[J]. WELDING & JOINING, 2022, (5). DOI: 10.12073/j.hj.20210624002
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B1500HS热成形钢与DP钢的点焊接头拉剪性能

Tensile-shear properties of resistance spot welded joints of B1500HS hot forming steel

摘要

    摘要
  • 摘要: 文中以3种强度级别的双相钢(DP780,DP980,DP1180)和B1500HS热成形钢的电阻点焊接头为研究对象，研究了DP钢强度对点焊接头拉剪性能的影响，分别观察和分析了接头宏观形貌和微观组织，测试和分析了接头的硬度分布及接头的断裂模式。结果表明，DP钢强度对接头的拉剪强度影响很小，但会影响其断裂模式。B1500HS/DP780的断裂是焊核从DP钢侧拔出，另2种的则是焊核从B1500HS侧拔出，但它们的初始起裂位置均位于亚临界热影响区。B1500HS侧亚临界热影响区软化严重，较基体硬度下降约29%～36%，而DP780无明显软化现象，DP980和DP1180侧的亚临界热影响区软化率分别为17%和25%。说明在异种材料电阻点焊过程中其热影响区的软化程度会影响点焊接头的断裂模式。创新点： 对B1500HS分别与DP780，DP980，DP1180组成的RSW接头展开对比研究。
    Abstract: Three strength levels of DP steel (DP780, DP980,DP1180) and B1500HS resistance spot welded (RSW) joints were prepared and investigated in present paper. The influence of DP steel’s strength on tensile-shear properties of RSW joints were studied. The macroscopic morphology and microstructure of RSW joints were observed and analyzed by ultra-depth microscopy and scanning electron microscope (SEM). The hardness profile of welded joints were measured by Vickers microhardness tester. The results showed that strength of DP steel had negligible impact on tensile-shear strength of RSW joints but its fracture mode. The nugget was pulled out from DP steel side for B1500HS/DP780 RSW joint. The other two nuggets were pulled out from the B1500HS side. Their initial fracture locations were all located in subcritical HAZ (SCHAZ). The SCHAZ on the B1500HS side was seriously softened with 29%～36% hardness loss compared with its matrix. However, there was no obvious softening phenomenon for the SCHAZ on the DP780 side. The softening rates of the SCHAZ on the DP980 and DP1180 sides were 17% and 25%, respectively.Highlights: RSW joints composed of B1500HS and DP780, DP980, DP1180 were comparatively studied.
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    • 参考文献(16)
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出版历程
  • 收稿日期:  2021-06-23
  • 修回日期:  2022-01-16
  • 发布日期:  2022-05-24

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