Microstructure and mechanical properties of high-strength steel welding consumables with a minimum yield strength of 1100 MPa

Phillip Haslberger, Sylvia Holly, Wolfgang Ernst, Ronald Schnitzer

    Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

    20 Zitate (Scopus)


    Welded high-strength steel components have great potential for use in lightweight constructions or highly loaded structures. Welding of steels with a yield strength of more than 1100 MPa is particularly challenging because of the toughness requirements for the weld metal. Currently, a new generation of welding consumables with a minimum yield strength of 1100 MPa has been developed. Based on electron backscatter diffraction and atom probe tomography, a concept for toughening and strengthening of all-weld metal samples was deployed. Starting from a martensitic all-weld metal sample with an approximate yield strength of 1000 MPa, a reduction in manganese and silicon content resulted in a refined microstructure with a lower prior austenite grain size and effective grain size. Furthermore, a higher average grain boundary misorientation was measured, which influences the toughness positively. An addition of vanadium caused the formation of vanadium-rich clusters, which increased the strength of the all-weld metal significantly. With a combination of these two mechanisms, it was possible to produce an all-weld metal sample with the required yield strength of more than 1100 MPa and an acceptable toughness.
    Seiten (von - bis)6968-6979
    FachzeitschriftJournal of materials science
    PublikationsstatusVeröffentlicht - 24 Jan. 2018

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