Journal
METALS
Volume 9, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/met9070798
Keywords
hot-stamped steel; hydrogen induced delay cracking; inclusion; strain rate; hydrogen content; fractography
Funding
- National Nature Science Foundation of China [U1760203, 51571029]
- National Key Research and Development Program of China [2017YFB0304401]
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Hot-stamped steel has been widely used in automobile bumper and other safety components due to its high strength. Therefore, this paper investigates the e ff ect of hydrogen content and strain rate on hydrogen-induced delay cracking (HIDC) behavior. The results showed that the plasticity of the steel significantly decreased with an increase in hydrogen content or a decrease in the strain rate. Fractography was analyzed after tensile tests. It was found that all of the pre-charged specimens cracked at large-sized inclusions when stretched at a strain rate of 1 x 10(-3) s(-1), which indicates that, in this case, the defect itself in the material had great influence on the extend properties. No inclusions were found at the main fracture origin area for hydrogen steady-state specimens, when stretched at a strain rate of 1 x 10(-6) s(-1), which demonstrated that a slower strain rate causes greater influence by hydrogen. However, for the non-pre-charged samples, the fractures surface showed that cracking originated from the defect near the sample surface, which was independent of strain rates.
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