High strength bimetallic composite material fabricated by electroslag casting and characteristics of its composite interface

Abstract

Bimetallic composite material of bainitic steel and PD3 steel was produced with electroslag casting process, and element distribution of its composite interface was investigated by theoretical calculation and energy dispersive spectrometer (EDS). Results show that the tensile strength (1,450 MPa), hardness (HRC 41-47) and impact toughness (94.7J·cm-2) of bainitic steel were comparatively high, while its elongation was slightly low (4.0%). Tensile strength (1,100 MPa), hardness (>HRC 31) and elongation (7.72%) of the interface were also relatively high, but its impact toughness was low at 20.4 J·cm-2. Results of theoretical calculation of the element distribution in the interface region were basically consistent with that of EDS. Therefore, electroslag casting is a practical process to produce bimetallic composite material of bainitic steel and PD3 steel, and theoretical calculation also is a feasible method to study element distribution of their interface.