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Influence of martensite content and morphology on the toughness and fatigue behavior of high-martensite dual-phase steels

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Abstract

A series of high-martensite dual-phase (HMDP) steels exhibiting a 0.3 to 0.8 volume fraction of martensite (V m ), produced by intermediate quenching (IQ) of a vanadium and boron-containing microalloyed steel, have been studied for toughness and fatigue behavior to supplement the contents of a recent report by the present authors on the unusual tensile behavior of these steels. The studies included assessment of the quasi-static and dynamic fracture toughness and fatigue-crack growth (FCG) behavior of the developed steels. The experimental results show that the quasi-static fracturetoughness (K ICV ) increases with increasing V m in the range between V m =0.3 and 0.6 and then decreases, whereas the dynamic fracture-toughness parameters (K ID , K D , and J ID ) exhibit a significant increase in their magnitudes for steels containing 0.45 to 0.60 V m before achieving a saturation plateau. Both the quasi-static and dynamic fracture-toughness values exhibit the best range of toughnesses for specimens containing approximately equal amounts of precipitate-free ferrite and martensite in a refined microstructural state. The magnitudes of the fatigue threshold in HMDP steels, for V m between 0.55 and 0.60, appear to be superior to those of structural steels of a similar strength level. The Paris-law exponents (m) for the developed HMDP steels increase with increasing V m , with an attendant decrease in the pre-exponential factor (C).

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Authors and Affiliations

  1. Materials and Corrosion Assessment and Testing, Det Norske Veritas Pte Ltd., DNV Technology Centre, 118 224, Singapore

    Asim Bag (Senior Materials Engineer)

  2. the Department of Metallurgical and Materials Engineering, Indian Institute of Technology, 721 302, Kharagpur, India

    K. K. Ray (Professor)

  3. the Department of Metallurgy, Indian Institute of Science, 560 012, Bangalore, India

    E. S. Dwarakadasa (Professor)

Authors
  1. Asim Bag
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  2. K. K. Ray
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  3. E. S. Dwarakadasa
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Bag, A., Ray, K.K. & Dwarakadasa, E.S. Influence of martensite content and morphology on the toughness and fatigue behavior of high-martensite dual-phase steels. Metall Mater Trans A 32, 2207–2217 (2001). https://doi.org/10.1007/s11661-001-0196-5

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  • DOI: https://doi.org/10.1007/s11661-001-0196-5

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