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Influence of Vanadium on Microstrain Partitioning and Evolution of Microstructural Damage in DP1300 Steel

25 Pages Posted: 31 Oct 2018 First Look: Under Review

See all articles by Linfeng Zhou

Linfeng Zhou

McMaster University - Department of Materials Science and Engineering

Javad Samei

McMaster University - Department of Materials Science and Engineering

Jidong Kang

Government of Canada - CanmetMATERIALS

David S. Wilkinson

McMaster University - Department of Materials Science and Engineering

Abstract

We have investigated the effect of vanadium addition on a DP1300 ferrite-martensite steel, particularly in terms of microstructure, deformation, and damage behavior at the microscopic level. DP steels with and without vanadium addition were given slightly altered heat treatments to produce similar martensite content and ultimate tensile strength in both steels. The addition of 0.14wt% vanadium to the reference alloy yields a dispersion of nano-scale vanadium carbonitrides throughout the microstructure along with a pronounced grain refinement. Microscopic digital image correlation (╬╝DIC) was employed to analyze the local strain partitioning between ferrite and martensite at the grain level. It was found that the addition of V increases the mechanical compatibility between ferrite and martensite. The consequent enhanced mechanical homogeneity and reduced strain gradients at the ferrite-martensite interface suppresses damage, thus enhancing ductility of the V-added alloy. Interrupted tensile tests coupled with X-ray computed tomography confirm that microstructural damage growth is slower in the V-added steel during post-uniform elongation prior to fracture.

Keywords: microstrain partitioning, digital image correlation, dual phase steels, Vanadium, X-ray computed tomography

Suggested Citation

Zhou, Linfeng and Samei, Javad and Kang, Jidong and Wilkinson, David S., Influence of Vanadium on Microstrain Partitioning and Evolution of Microstructural Damage in DP1300 Steel (October 30, 2018). Available at SSRN: https://ssrn.com/abstract=3275443

Linfeng Zhou (Contact Author)

McMaster University - Department of Materials Science and Engineering

1280 Main Street West
Hamilton, Ontario L8S 4M4
Canada

Javad Samei

McMaster University - Department of Materials Science and Engineering ( email )

1280 Main Street West
Hamilton, Ontario L8S 4M4
Canada

Jidong Kang

Government of Canada - CanmetMATERIALS

Ottawa, Ontario K1A 0E9
Canada

David S. Wilkinson

McMaster University - Department of Materials Science and Engineering

1280 Main Street West
Hamilton, Ontario L8S 4M4
Canada

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