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The assessment of second pulse effects on the microstructure and fracture behavior of the resistance spot welding in advanced ultrahigh-strength steel TRIP1100
Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran.
Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran.
Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran.
Department of Materials Science and Engineering, Dezful Branch, Islamic Azad University, Iran.
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2019 (English)In: Iranian Journal of Materials Science and Engineering, ISSN 1735-0808, Vol. 16, no 2, p. 79-88Article in journal (Refereed) Published
Abstract [en]

In this study, the effects of the second pulse resistance spot welding on the microstructure and mechanical properties of transformation induced plasticity 1100 steel were evaluated. The thermal process after welding was designed to improve metallurgical properties with pulse currents of 6 kA, 9 kA, and 12 kA after initial welding with 10 kA current. The effect of the second pulse on mechanical and microstructural properties was investigated. The fracture of the welds was for pulsed samples of 6 kA and 9 kA pull out with mechanical test. Due to the existence of the microstructure including the equiaxial dendritic and finer in fusin zone in the pulsed current of 9 kA, the maximum fracture energy, and maximum force were observed. A significant decrease in the FZ hardness in 6 kA current was observed in the nano-hardness results, which was attributed to the existence of martensitic and ferrite temper. The highest ratio of CTS/TSS was obtained for 6 kA and 9 kA, respectively, and force-displacement evaluation was maximum in 9 kA. The fracture surfaces included dendrites and dimples. The results of partial fracture revealed separation in the coherent boundaries of the coarse grain of the annealed region.

Place, publisher, year, edition, pages
Iran University of Science and Technology , 2019. Vol. 16, no 2, p. 79-88
Keywords [en]
Dendritic microstructure, Fracture surface, Resistance spot welding, Second pulse current, Shear tensile
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:hj:diva-45390DOI: 10.22068/ijmse.16.2.79ISI: 000472646400008Scopus ID: 2-s2.0-85068678947Local ID: POA JTH 2019;JTHMaterialISOAI: oai:DiVA.org:hj-45390DiVA, id: diva2:1338525
Available from: 2019-07-23 Created: 2019-07-23 Last updated: 2019-07-23Bibliographically approved

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Ghassemali, Ehsan

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  • apa
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