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[bhagwantP]

Hello javat33489,

As Ram suggested you need to have experimental data to determine this.

Additional links for your study purpose: Will not give you direct parameters which you are expecting but you can use this for your better understanding,

 

Determination of Johnson–Cook Plasticity Model Parameters for Inconel718 | SpringerLink

Determination of Johnson–Cook parameters from machining simulations - ScienceDirect