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2011 №07 (02) 2011 №07 (04)

The Paton Welding Journal 2011 #07
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
 
 
References
1. Goldshtejn, M.I., Farber, V.M. (1979) Dispersion strengthening of steel. Moscow: Metallurgiya.
2. Lagneborg, R., Sivetsky, T., Zayats, S. et al. (2001) Role of vanadium in microalloy steels. Ekaterinburg: Mariya.
3. Khajsterkami, F., Khulka, K., Matrosov, Yu.I. et al. (1999) Niobium-containing low-alloy steels. Moscow: Intermet Engineering.
4. Pokhodnya, I.K., Golovko, V.V., Denisenko, A.V. et al. (1999) Effect of oxygen on formation of acicular ferrite structure in low-alloy metal of welds. Avtomatich. Svarka, 2, 2-10.
5. Ito, G., Nakanishi, M. Study on Charpy impact properties of weld metals with submerged arc welding. IIW Doc. XIA-113-75.
6. Svensson, L.-E., Gretoft, B. (1990) Microstructure and impact toughness of C-Mn weld metals. Welding Res. Supp., Dec., 454-461.
7. Evans, G.M. The effect of carbon on the microstructure and properties of C-Mn all-weld-metal deposits. IIW Doc. II-A-546-81.
8. Cole, W., Colvin, P. (1971) Submerged arc welding of higher tensile steels. Metal Constr. and British Welding J., 3, 131-135.

Suggested Citation

V.V. GOLOVKO, V.A. KOSTIN and G.M. GRIGORENKO (2011) PECULIARITIES OF THE INFLUENCE OF COMPLEX ALLOYING ON STRUCTURE FORMATION AND MECHANICAL PROPERTIES OF WELDS ON LOW-ALLOYED HIGH-STRENGTH STEELS. The Paton Welding J., 07, 11-17.