Shear band formation at the fusion boundary and failure behaviour of resistance spot welds in ultra-high-strength hot-stamped steel

The failure of resistance spot welds in ultra-high-strength press-hardened steels often occurs due to martensite tempering in the heat-affected zone. In the present work, however, it is shown that the failure occurs by local shear band formation at the fusion boundary (FB) in spot welds in press-har...

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Bibliographic Details
Published inScience and technology of welding and joining Vol. 25; no. 7; pp. 556 - 563
Main Authors Mohamadizadeh, Alireza, Biro, Elliot, Worswick, Michael
Format Journal Article
LanguageEnglish
Published London, England Taylor & Francis 02.10.2020
SAGE Publications
Subjects
Failure
Halo ring
HAZ softening
Hot stamping
Microstructure
Numerical modelling
Shear band
Spot weld
Spot weld
Halo ring
HAZ softening
Hot stamping
Microstructure
Shear band
Numerical modelling
Failure
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Summary:The failure of resistance spot welds in ultra-high-strength press-hardened steels often occurs due to martensite tempering in the heat-affected zone. In the present work, however, it is shown that the failure occurs by local shear band formation at the fusion boundary (FB) in spot welds in press-hardened 22MnB5 (Al-Si coated). The failure behaviour of spot welds was investigated to understand failure mechanisms with respect to microstructural features. The results showed that a 104 μm wide shear band is located in a local area of softening adjacent to the FB. A fine-meshed model was developed using hardness-based local properties to simulate the softened zone which was able to capture the observed failure at the FB interface.
ISSN:1362-1718
1743-2936
DOI:10.1080/13621718.2020.1773057