| 2011 №07 (02) | 2011 №07 (04) |
The Paton Welding Journal, 2011, #7, 11-17 pages
PECULIARITIES OF THE INFLUENCE OF COMPLEX ALLOYING ON STRUCTURE FORMATION AND MECHANICAL PROPERTIES OF WELDS ON LOW-ALLOYED HIGH-STRENGTH STEELS
V.V. GOLOVKO, V.A. KOSTIN and G.M. GRIGORENKO
E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
Abstract
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 (st == 700-710 MPa) and impact toughness (KCV-20 = 80-100 J/cm2).
Keywords: arc welding, high-strength low-alloyed steels, ceramic flux, microstructure, austenite decomposition, acicular ferrite, nonmetallic inclusions, mechanical properties
Received: ??.??.??
Published: 28.07.11
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