Hi Tim,
I think you should use the element birth and death technique to simulate this process. Assign the temperature value for alive and then use death for the subsequent steps. Enter the number of steps in the analysis setting as per your requirements and adjust the time for that. I have attached the following link regarding death and birth techniques that might be helpful for you.
Chapter 8: Element Birth and Death (ansys.com)
https://simutechgroup.com/performing-ekill-element-death-in-mechanical/#:~:text=Element%20Birth%20and%20Death%20Techniques%20%7C%20Ansys%20Workbench&text=An%20APDL%20Commands%20Object%20can,step%20number%2C%20or%20other%20criteria.
Regards,
Sampat
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