Papers by Keyword: Coalesced Bainite

Abstract: Carbide free bainite has achieved the highest strength and toughness combinations to date for bainitic steels in as-rolled conditions. By alloying designing and with the help of phase transformation theory, it was possible to improve simultaneously the strength and toughness because of the ultra-fine grain size of the bainitic ferrite plates. Ultimate tensile strengths ranging from 1600 MPa to 1800 MPa were achieved while keeping a total elongation higher than 10 %. Their toughness at room temperature matches tempered martensitic steels, known to be the best-in-class regarding this property. However, it has been observed that the presence of coalesced bainite leads to a dramatic deterioration in toughness in these novel high strength bainitic steels.

Abstract: The recent investigations about high strength manganese – nickel alloyed weld metals are reviewed. The mechanical properties from different alloying concepts and the associated microstructures are compared. Interesting similarities regarding the tensile and impact strength is noted, while large variations in microstructure is found.