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Evaluation of Resistance Spot Weld Interfacial Fractures in Tensile-Shear Tests of TRIP 590 Steels  

Park, Sang-Soon (Dept. of Advanced Material Engineering, Dong-eui University)
Lee, Sang-Min (Dept. of Advanced Material Engineering, Dong-eui University)
Cho, Yongjoon (Fundamental Engineering Development Team, Hyundai Motor Company)
Kang, Nam-Hyun (Division of Materials Science and Engineering, Pusan National University)
Yu, Ji-Hun (Dept. of Powder Materials Research, Korea Institute of Materials Science)
Kim, Young-Seok (Division for Dongnam Area Technology Service, Korea Institute of Industrial Technology)
Park, Yeong-Do (Dept. of Advanced Material Engineering, Dong-eui University)
Publication Information
Korean Journal of Metals and Materials / v.46, no.10, 2008 , pp. 672-682 More about this Journal
Abstract
The resistance spot welding of TRIP590 steels was investigated to enhance understanding of weld fracture during tensile-shear strength (TSS) test. The main failure modes for spot welds of TRIP590 steels were nugget pullout and interfacial fracture. The peak load to cause a weld interfacial failure was found to be related to fracture toughness of the weld and the weld diameter. Although interfacial fracture occurred in the samples, the load carrying capacity of the weld was high and not significantly affected by the fracture mode. Substantial part of the weld exhibits the characteristic dimple (or elongated dimple) fractures on interfacial fractured surface, in spite of the high hardness values associated with the martensite microstructures. The high load-bearing ability of the weld is directly associated with the area of ductile fracture occurred in weld. Therefore, the judgment of the quality of resistance spot welds in TRIP590 steels, the load carrying capacity of the weld should be considered as an important factor than fracture mode.
Keywords
trip steels (TRIP590); resistance spot weld; interfacial fracture; tensile-shear test;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
Times Cited By Web Of Science : 5  (Related Records In Web of Science)
Times Cited By SCOPUS : 5
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