I went to the ANSYS Help system, and found the equation for Norton so that I understood the creep model in another discussion.
ANSYS Help > Home > Mechancial APDL > Material Reference > Nonlinear Material Properties > Rate Dependent Plasticity > Creep
The Combined Time Hardening entry says only C1 > 0 and C5 > 0.
Where did you obtain the creep constants? What units of stress are required to use those constants?
It seems your solution begins, so you have some results.
Please reply with a snapshot of the graph of maximum displacement vs. time.
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