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Journal of Materials Engineering and Performance

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20-03-2019

Characterization of Static Performance and Failure of Resistance Spot Welds of High-Strength and Press-Hardened Steels

Authors: K. Paveebunvipak, V. Uthaisangsuk

Published in: Journal of Materials Engineering and Performance | Issue 4/2019

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Abstract

The static performances and failure characteristics of resistance spot welds (RSW) of steel sheets were studied in this work. Both similar and dissimilar joints of press-hardened steel grade 22MnB5 and as-rolled high-strength steel grade 1000 were examined. From metallographic analyses and micro-hardness measurements, it was shown that the microstructures of base metal (BM), heat affected zone (HAZ) and fusion zone of steel joints were noticeably different. In particular, the HAZ close to BM or subcritical HAZ (SCHAZ) of 22MnB5 steel exhibited greatly decreased hardness due to occurring tempered martensite, in which carbide precipitation was clearly observed. Furthermore, tensile shear test and cross-tension test of the welded steel sheets were carried out. The determined maximum loads, energy absorbability and corresponding failure mechanisms were analyzed and compared. The RSW samples of similar steel grade 1000 provided the highest load-carrying capacity and absorbed energy in both tests. Due to the large hardness difference and soft zone in weldment of dissimilar steel specimen, failure loads and static absorbed energies were deteriorated up to 17 and 68%, respectively. The observed fracture occurrences of all investigated joints were pullout failure mode, in which BM and HAZ were the crack initiation sites of grades 1000 steel and 22MnB5 steel, respectively. The SCHAZ of welded boron steel considerably caused the failure onset in tension shear test, but seemed to have negligible effect on cross-tension test.

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Title: Characterization of Static Performance and Failure of Resistance Spot Welds of High-Strength and Press-Hardened Steels
Authors: K. Paveebunvipak
V. Uthaisangsuk
Publication date: 20-03-2019
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 4/2019
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-019-03988-2

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