Properties of High Strength Low Alloy Steel after Welding (CROSBI ID 675473)
Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Kosec, Gorazd ; Gojić, Mirko ; Kožuh, Stjepan ; Kosec, Borut ; Ivanić, Ivana
engleski
Properties of High Strength Low Alloy Steel after Welding
Niomol 490 K steel belongs to the group of High Strength Low Alloy Steel (HSLA). The aim of this study was to determine the transition temperature of the Charpy impact toughness of welded Niomol 490 K steel. The samples for testing of the Charpy impact toughness were heat treated in order to obtain different microstructures. Metallographic samples were prepared according to the classical procedure. For microstructure analysis an optical microscope and scanning electron microscope were used. Heating that appears at the deposition of the next welding layer was simulated by short heating into the two-phase region (austenite and ferrite). It is found that impact toughness is highly dependent on steels microstructure. The transition temperature of the Niomol 490 K steel in the initial state was about -67 ° C. After water quenching from 920 °C, the Charpy impact toughness of the upper level was reduced to about a half of the value than that of the steel in the initial state. After reheating to 750 °C, the toughness was reduced by approximately half of the value that in water quenched sample. The fracture surface in the region of a completely ductile fracture shows the areas of shear decohesion. The transition from the brittle to the ductile fracture shows that the crack propagation path expands with the plane slip to the first tiny dimples.
High Strength Low Alloy Steel, welding, microstructure
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Podaci o prilogu
55-63.
2019.
objavljeno
Podaci o matičnoj publikaciji
Contemporary materials 2018
Kuzmanović, Rajko ; Mirjanić, Dragoljub
Banja Luka: ANURS Banja Luka
Podaci o skupu
Nepoznat skup
poster
29.02.1904-29.02.2096