Influence of martensite content and morphology on tensile and impact properties of high-martensite dual-phase steels |
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| Authors: | A Bag K K Ray E S Dwarakadasa |
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| Affiliation: | (1) Present address: Materials Science Laboratory, R&D Centre, Bharat Earth Movers Limited, Kolar Gold Fields, 563115, India;(2) the School of Mechanical and Production Engineering, Nanyang Technological University, 639798, Singapore;(3) the Department of Metallurgical and Materials Engineering, Indian Institute of Technology, 721 302 Kharagpur, India;(4) the Department of Metallurgy, Indian Institute of Science, 560 012 Bangalore, India |
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| Abstract: | A series of dual-phase (DP) steels containing finely dispersed martensite with different volume fractions of martensite (V
m) were produced by intermediate quenching of a boron- and vanadium-containing microalloyed steel. The volume fraction of martensite
was varied from 0.3 to 0.8 by changing the intercritical annealing temperature. The tensile and impact properties of these
steels were studied and compared to those of step-quenched steels, which showed banded microstructures. The experimental results
show that DP steels with finely dispersed microstructures have excellent mechanical properties, including high impact toughness
values, with an optimum in properties obtained at ∼0.55 V
m. A further increase in V
m was found to decrease the yield and tensile strengths as well as the impact properties. It was shown that models developed
on the basis of a rule of mixtures are inadequate in capturing the tensile properties of DP steels with V
m>0.55. Jaoul-Crussard analyses of the work-hardening behavior of the high-martensite volume fraction DP steels show three
distinct stages of plastic deformation. |
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