Investigation on microstructural features and tensile shear fracture properties of resistance spot welded advanced high strength dual phase steel sheets in lap joint configuration for automotive frame applications

IF 1.7 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of the Mechanical Behavior of Materials Pub Date : 2022-01-01 DOI:10.1515/jmbm-2022-0006

C. Rajarajan, P. Sivaraj, Tushar Sonar, S. Raja, N. Mathiazhagan

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引用次数: 5

Abstract

Abstract The main objective of this research paper is to study the microstructural features and mechanical properties of resistance spot welded advanced high-strength steel of dual phase grade in lap joint configuration which is mainly employed in sheet form for fabrication of the automotive structure. Resistance spot welding (RSW) being a solid-state welding (SSW) process is used to overcome the problems in fusion welding of AHSS-DP steel such as heat affected zone (HAZ) softening, solidification cracking and distortion which significantly deteriorates the mechanical properties of AHSS-DP800 steel joints. The straight lap (SL-TSFL) and cross lap tensile shear fracture load (CL-TSFL) of spot joints were evaluated. Optical microscopy (OM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques were used to characterize the weld nugget. The X-ray diffraction (XRD) results are also presented for phase identification in the weld nugget. The fracture surface of failed TSFL specimens was analyzed using SEM. The lap joints made using RSW disclosed superior SL-TSFL, CL-TSFL, and WNZH of 21.7 kN, 17.65 kN, and 589 HV0.5 The superior joint strength and hardness of the weld nugget zone are correlated to the evolution of lath martensite in the nugget zone.

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汽车车架搭接结构高级高强度双相钢电阻点焊微结构特征及拉伸剪切断裂性能研究

摘要本论文的主要目的是研究主要用于汽车结构件薄板制造的双相级高级高强度钢搭接电阻点焊的显微组织特征和力学性能。电阻点焊(RSW)是一种固态焊接(SSW)工艺，用于克服AHSS-DP800钢在熔焊中存在的热影响区(HAZ)软化、凝固开裂和变形等问题，这些问题严重影响了AHSS-DP800钢接头的力学性能。对点节点的直搭接(SL-TSFL)和交叉搭接拉伸剪切断裂载荷(CL-TSFL)进行了评价。采用光学显微镜(OM)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)技术对焊缝熔核进行了表征。给出了焊缝熔核的x射线衍射(XRD)结果。利用扫描电镜对失效TSFL试样的断口形貌进行了分析。RSW搭接接头的SL-TSFL、CL-TSFL和WNZH分别为21.7 kN、17.65 kN和589 HV0.5，接头强度和硬度的提高与焊核区板条马氏体的演化有关。

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来源期刊

Journal of the Mechanical Behavior of Materials Materials Science-Materials Science (miscellaneous)

CiteScore

3.00

自引率

11.10%

发文量

审稿时长

30 weeks

期刊介绍： The journal focuses on the micromechanics and nanomechanics of materials, the relationship between structure and mechanical properties, material instabilities and fracture, as well as size effects and length/time scale transitions. Articles on cutting edge theory, simulations and experiments – used as tools for revealing novel material properties and designing new devices for structural, thermo-chemo-mechanical, and opto-electro-mechanical applications – are encouraged. Synthesis/processing and related traditional mechanics/materials science themes are not within the scope of JMBM. The Editorial Board also organizes topical issues on emerging areas by invitation. Topics Metals and Alloys Ceramics and Glasses Soils and Geomaterials Concrete and Cementitious Materials Polymers and Composites Wood and Paper Elastomers and Biomaterials Liquid Crystals and Suspensions Electromagnetic and Optoelectronic Materials High-energy Density Storage Materials Monument Restoration and Cultural Heritage Preservation Materials Nanomaterials Complex and Emerging Materials.