The thermostatic compression experiment of centrifugal casting 40 Cr/Q345 B bimetal was conducted under deformation temperature of 1 223～1 473 K

strain rate of 0.005～1 s

-1

and deformation rate of 60% based on Gleeble-3500 thermal simulation testing machine. The thermal deformation behavior of 40 Cr/Q345 B bimetal bonding layer by centrifugal casting was investigated and the thermal processing diagram was established.The results indicate that the rheological stress of 40 Cr/Q345 B bimetal is decreased with the increase of temperature and the decrease of strain rate

and the thermal deformation activation energy is 241.589 kJ·mol

-1

. Based on the hot working map and microstructure

the parameters of hot working were determined as follows: deformation temperature of 1 293～1 373 K

strain rate of 0.5～1 s

-1

.