Heat treatments are considered as one of the most important methods used to make signif-icant changes in the microstructure of the metallic materials and their alloys, which makesit possible to change the external behavior and properties of these materials. The effect ofheat treatment at 900◦C on the microstructure, hardness and flexural behavior of bimetalbeams has been studied in the present work. The bimetal beams composed of a high-CrWCI as a wear-resistant part and an AISI4140 steel as a ductile part were fabricated. Thetwo parts of bimetal castings are joined together by means of dovetail joint and/or connec-tor pins. The present experimental and numerical results revealed that all bimetal beamsexhibited flexural strength, toughness and maximum deflection higher than those of high-Cr WI specimen and lower than those of AISI4140 specimen in heat treated conditions. Heattreatment of the bimetal casting beams produced significant improvements in both hard-ness and flexural strength of high-Cr WI and AISI4140 steel. This is due to the formationof secondary carbides in the martensitic matrix surrounded by a network of M7C3carbidesin high-Cr WI, and formation of fine pearlite with proeutectoid _ at grain boundaries forAISI4140 steel as revealed by SEM and an optical metallography. Bimetal beam with 12-connector pins (BI12CONN) as a mechanical joint exhibited the highest flexural strengthand toughness compared with the other bimetal beams after heat treatment.