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Effect of susceptibility to interfacial fracture on fatigue properties of spot-welded high strength sheet steel

journal contribution
posted on 2007-01-01, 00:00 authored by Tim HilditchTim Hilditch, J Speer, D Matlock
While advanced high strength steels (AHSS) have numerous advantages for the automotive industry, they can be susceptible to interfacial fracture when spot-welded. In this study, the susceptibility of interfacial fracture to spot-weld microstructure and hardness is examined, as well as the corresponding relationships between fatigue, overload performance, and interfacial fracture for a TRIP (transformation induced plasticity) steel. Simple post-weld heat-treatments were used to alter the weld microstructure. The effect on interfacial fracture of diluting the weld pool by welding the TRIP material to non-TRIP steel was examined, along with the effect of altering the base material microstructure. Results show that weld hardness is not a good indicator of either the susceptibility to interfacial fracture, or the strength of the joint, and that interfacial fracture does not necessarily lead to a decrease in strength compared to conventional weld-failure mechanisms, i.e. button pullout. It was also found that while interfacial fracture does affect low cycle to failure behavior, there was no effect on high cycle fatigue.

History

Journal

Materials and design

Volume

28

Issue

10

Pagination

2566 - 2576

Publisher

Scientific and Technical Press

Location

Reigate, England

ISSN

0264-1275

eISSN

1873-4197

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2006, Elsevier Ltd