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Understanding bake-hardening in modern high strength steels for the automotive industry using advanced analytical techniques

Conference Paper


Abstract


  • The bake-hardening behaviour of intercritically annealed, dual-phase (DP) and transformation induced plasticity (TRIP) steels was studied using X-ray diffraction, transmission electron microscopy (TEM) and three-dimensional atom probe tomography (APT). The DP steel showed an increase in the yield strength and the appearance of the upper and lower yield points after a single bake-hardening treatment compared with the as-received condition, while the mechanical properties of the TRIP steel remained unchanged. This appears to be due to the formation of plastic deformation zones with high dislocation density around the "as-quenched" martensite and segregation of carbon along these dislocations in the DP steel. Moreover, APT showed that the carbon content of polygonal ferrite in the DP steel was higher than in the TRIP steel. The carbon atom map of the DP steel after bakehardening treatment also revealed the formation of Fe3C carbides within the martensite crystal. APT of the TRIP steel showed the segregation of carbon around the dislocations in the retained austenite crystals.

Publication Date


  • 2008

Citation


  • Timokhina, I. B., Hodgson, P. D., Ringer, S. P., Zheng, R. K., & Pereloma, E. V. (2008). Understanding bake-hardening in modern high strength steels for the automotive industry using advanced analytical techniques. In New Developments on Metallurgy and Applications of High Strength Steels, Buenos Aires 2008 - Proc. Int. Conf. New Developments on Metallurgy and Applications of High Strength Steels Vol. 1 Plenary Lectures Automotive Applications High Temperature Applications Oils and Gas Applications (pp. 185-192).

Scopus Eid


  • 2-s2.0-62949236562

Web Of Science Accession Number


Start Page


  • 185

End Page


  • 192

Volume


  • 1 Plenary Lectures Automotive Applications High Temperature Applications Oils and Gas Applications

Abstract


  • The bake-hardening behaviour of intercritically annealed, dual-phase (DP) and transformation induced plasticity (TRIP) steels was studied using X-ray diffraction, transmission electron microscopy (TEM) and three-dimensional atom probe tomography (APT). The DP steel showed an increase in the yield strength and the appearance of the upper and lower yield points after a single bake-hardening treatment compared with the as-received condition, while the mechanical properties of the TRIP steel remained unchanged. This appears to be due to the formation of plastic deformation zones with high dislocation density around the "as-quenched" martensite and segregation of carbon along these dislocations in the DP steel. Moreover, APT showed that the carbon content of polygonal ferrite in the DP steel was higher than in the TRIP steel. The carbon atom map of the DP steel after bakehardening treatment also revealed the formation of Fe3C carbides within the martensite crystal. APT of the TRIP steel showed the segregation of carbon around the dislocations in the retained austenite crystals.

Publication Date


  • 2008

Citation


  • Timokhina, I. B., Hodgson, P. D., Ringer, S. P., Zheng, R. K., & Pereloma, E. V. (2008). Understanding bake-hardening in modern high strength steels for the automotive industry using advanced analytical techniques. In New Developments on Metallurgy and Applications of High Strength Steels, Buenos Aires 2008 - Proc. Int. Conf. New Developments on Metallurgy and Applications of High Strength Steels Vol. 1 Plenary Lectures Automotive Applications High Temperature Applications Oils and Gas Applications (pp. 185-192).

Scopus Eid


  • 2-s2.0-62949236562

Web Of Science Accession Number


Start Page


  • 185

End Page


  • 192

Volume


  • 1 Plenary Lectures Automotive Applications High Temperature Applications Oils and Gas Applications