Macro-indentation fracture mechanisms in a super-hard hardfacing Fe-based electrode

摘要

A super-hard hardfacing Fe-based electrode with 911 HV30 was applied to st37 substrate using flux-cored arc welding method. Microstructural study was accomplished using X-ray diffraction, scanning electron microscope and microscopic image analysis software. The fracture toughness properties of the phases were examined using the macro-indentation fracture toughness method. In the fracture toughness test, Palmqvist cracking mode was observed and the fracture toughness of the hardfacing steel was calculated to be 23.1 MPa root m. Furthermore, preferential crack growth direction, crack growth steps and the fracture behavior of the phases were determined using scanning electron microscope images.