abaqus——AM-Modeler

AM-Modeler Abaqus CAE 

Hello, everyone. I just started using abaqus.
I am using AM-Modeler to simulate a coaxial powder feeding additive manufacturing. The initial temperature of the substrate is 25°C and the initial temperature of the powder is 518°C. However, I set the initial condition to 518°C for the powder, which resulted in the temperature being 518°C only in the initial stage and then becoming very low.
I think I made a mistake by setting 518C for initial during the initial condition setting, but I couldn't find a way to keep the powder temperature at 518C.