Investigations Into the Influence of Weld Zone on Formability of Fiber Laser-Welded Advanced High Strength Steel

K. Bandyopadhyay; S. K. Panda; P. Saha

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Investigations Into the Influence of Weld Zone on Formability of Fiber Laser-Welded Advanced High Strength Steel

机译：焊接区对纤维激光焊接高级高强度钢成形性影响的研究

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In this study, two different dual phase steel grades DP980 and DP600, and IFHS steel sheets were laser welded by a 2-kW fiber laser. The weld quality of these three different LWBs was assessed with the help of microstructure, micro-hardness and transverse tensile tests. Tensile testing of longitudinal and miniature samples was performed to evaluate the mechanical properties of the weld zone. Formability of parent materials and LWBs were assessed in bi-axial stretch forming condition by Erichsen cupping test. To validate the weld zone properties, 3-D finite element models of Erichsen cupping test of LWBs was developed, and the failures in the deformed cups were predicted using two theoretical forming limit diagrams. It was observed that hardness of the fusion zone and HAZ in laser welded DP600 and IFHS steels was more compared to the respective parent metal. However, 29% reduction in hardness was observed at the outer HAZ of DP980 steel weldments due to tempering of martensite. Reduction of formability was observed for all the LWBs with two distinct failure patterns, and the maximum reduction in formability was observed in the case of DP980 LWBs. The presence of the soft zone is detrimental in forming of welded DP steels.

机译：在这项研究中，两种不同的双相钢牌号DP980和DP600，以及IFHS钢板通过2 kW光纤激光器进行激光焊接。借助显微组织，显微硬度和横向拉伸试验，对这三种不同的轻薄板的焊接质量进行了评估。对纵向和微型样品进行拉伸测试以评估焊接区的机械性能。通过Erichsen拔罐测试在双轴拉伸成型条件下评估母体材料和LWB的可成型性。为了验证焊接区的性能，建立了LWBs的Erichsen拔罐试验的3-D有限元模型，并使用两个理论的成形极限图预测了变形杯的失效。可以看出，与相应的母材相比，激光焊接的DP600和IFHS钢中的熔合区和HAZ的硬度更高。但是，由于马氏体回火，在DP980钢焊件的外部热影响区发现硬度降低了29％。对于具有两种不同失效模式的所有LWB，观察到可成形性降低，而在DP980 LWB的情况下，可成形性最大降低。软区的存在对DP焊接钢的成型有害。

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来源
《Journal of Materials Engineering and Performance》 |2014年第4期|共15页
作者
K. Bandyopadhyay; S. K. Panda; P. Saha;
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正文语种 eng
中图分类金属学与金属工艺;工程材料学;
关键词
Mechanical testing; Stamping; Welding;

机译：机械测试;冲压;焊接;

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专利

1. Investigations Into the Influence of Weld Zone on Formability of Fiber Laser-Welded Advanced High Strength Steel [J] . K. Bandyopadhyay, S. K. Panda, P. Saha Journal of Materials Engineering and Performance . 2014,第4期

机译：焊接区对纤维激光焊接高级高强度钢成形性影响的研究
2. Influence of fusion zone size and failure mode on mechanical performance of dissimilar resistance spot welds of AISI 1008 low carbon steel and DP600 advanced high strength steel [J] . M. Pouranvari, S.M. Mousavizadeh, S.P.H. Marashi, Materials & design . 2011,第3期

机译：熔合区尺寸和破坏方式对AISI 1008低碳钢和DP600高强度高强度钢异种电阻点焊机械性能的影响
3. Influence of surface oxide on mechanical properties of laser-welded hot-press-forming steel with strength of 1.8 GPa [J] . Kang Minjung, Kim Cheolhee Journal of Laser Applications . 2018,第3期

机译：表面氧化物对强度为1.8 GPa的激光焊接热压成型钢的力学性能的影响
4. INFLUENCE OF SURFACE OXIDE ON MECHANICAL PROPERTIES OF LASER-WELDED HOT-PRESS-FORMING STEEL WITH STRENGTH OF 1.8 GPa [C] . Minjung Kang, Cheolhee Kim International Congress on Applications of Lasers Electro-Optics . 2017

机译：表面氧化物对激光焊接热压成形钢力学性能的影响，强度为1.8GPa
5. Expulsion investigation and fracture characteristics in spot welded advanced high strength auto steels. [D] . Ma, Chao. 2006

机译：点焊高级高强度汽车钢的排屑研究和断裂特性。
6. Investigation of Welds and Heat Affected Zones in Weld Surfacing Steel Plates Taking into Account the Bead Sequence [O] . Miloš Mičian, Jerzy Winczek, Marek Gucwa, 2020

机译：考虑珠子序列的焊缝焊接钢板焊缝和热影响区的研究
7. Mechanical properties of various concrete after high temperature exposure Mechanical property of various types of concrete after high temperature exposure is investigated. Considering compressive strength requirement for a vertical element in high rise building, concrete specimens with various design strengths of 35, 80, 100, and 150 MPa were tested. Particularly, the influence of incorporated steel fiber on fire resistance is of interest in this study. Experimental results show that the fire resistance depends on the design strength and steel fiber content. Normal strength concrete (NSC) of a design strength of 35 MPa or high performance concrete (HPC) of 80-100 MPa does not spall when exposed to 100-400 °C of temperature. However, an explosive spalling occurs at 300 °C when the HPCs contain 1 vol. of steel fiber. Ultra-high performance concrete (UHPC) of a design strength of 150 MPa and 1.5 vol. of steel fiber also shows dramatic spalling at 300 °C. The experimental results found in this study can contribute to a better understanding of the behaviors of HPC and UHPC under fire and the role of steel fiber on the fire resistance. [O] . 2017

机译：研究了高温暴露后各种混凝土高温曝光机械性能各种混凝土的机械性能。考虑到高层建筑中垂直元件的抗压强度要求，测试了35,80,100和150MPa各种设计强度的混凝土试样。特别是，在这项研究中，掺入钢纤维对耐火性的影响。实验结果表明，耐火性取决于设计强度和钢纤维含量。在暴露于100-400°C的温度时，80-100MPa的设计强度为35MPa或高性能混凝土（HPC）的正常强度混凝土（NSC）不会击落。然而，当HPC含有1体积的钢纤维的百分比时，爆炸性剥落发生在300℃。超高性能混凝土（UHPC）的设计强度为150 MPa和1.5 Vol。钢纤维的百分比也显示出300℃的剧烈剥落。本研究中发现的实验结果可以有助于更好地了解在火灾中的HPC和UHPC的行为以及钢纤维对耐火性的作用。

Investigations Into the Influence of Weld Zone on Formability of Fiber Laser-Welded Advanced High Strength Steel

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