Study on Steady-State Interfacial Heat Transfer Behavior between Copper/Brass and Die Steel
The contact heat transfer coefficient directly determines the temperature distribution of the metal hot working process,which further affects the microstructure and service performance of the parts.Using the self-developed steady-state contact heat transfer equipment and measurement system,the contact heat transfer behavior of pure copper,H62 brass and H13 die steel at the contact surface temperature of 200-600℃and the pressure range of 1.56-12.56 MPa was systematically studied.The results show that the loading history has a great influence on the contact heat transfer coefficient.Compared with loading from a low load to a target pressure,the contact heat transfer coefficient measured from a high load unloading to the same target pressure is higher.Under the same loading history,the contact heat transfer coefficient increases with the increase of the interface temperature difference,and the contact heat transfer coefficient increases rapidly when the interface temperature is higher than 400℃;the contact heat transfer coefficient increases exponentially with the pressure,and the increase of the contact heat transfer coefficient gradually becomes slower as the pressure increases;under the same conditions,the temperature gradient during heat transfer of brass/H13 is larger,resulting in a larger contact heat transfer coefficient of brass/H13.
copperbrasshot working technologyinterfacial heat transfer coefficientinterface temperature differencepressure
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