PECULIARITIES OF THE INFLUENCE OF COMPLEX ALLOYING ON STRUCTURE FORMATION AND MECHANICAL PROPERTIES OF WELDS ON LOW-ALLOYED HIGH-STRENGTH STEELS

摘要

Influence of technological factors (oxygen potential of the flux, welding wire-base metal combination, and cooling rate) on mechanical properties of the studied welds on high-strength low-alloyed 12KhN2MDF and 09G2FB steels was analyzed. Derived results are in agreement with the type of microstructure, composition and distribution of non-metallic inclusions, and features of austenite decomposition in the studied weld metal. It is shown that addition of finely-dispersed refractory inclusions of titanium and zirconium oxides to the weld metal allows achievement of high values of strength (σ_t = 700-710 MPa) and impact toughness (KCV_(20) = 80-100 J/cm~2).