CRACK INITIATION AND GROWTH UNDER CYCLIC LOADING IN STEEL, HARDFACING WITH ALUMINUM BRONZE BY TIG WELDING METHOD

Nikolay VALCHEV, Yaroslav ARGIROV, Diyan DIMITROV, Tatyana MECHKAROVA

Abstract


The article presents a study of fatigue properties and microstructure of steel, hardfacing with CuAl8Ni2 (aluminum bronze). The TIG welding method is used. The coated specimens are made of structural steel C45. Some structural transformations were found in the zone of the added metal, the fusion zone and the heat affected zone (HAZ). The research includes determination of microhardness and macrostructural changes in individual zones. Axial resonance fatigue tests under symmetrical loading cycle (R=-1) were carried out, on ultrasonic fatigue machine at 20kHz, observing the crack initiation and growth in the specimen body. Micro and macro structural studies were carried out in the crack initiation zone.

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