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VERSION:2.0
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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 27
SUMMARY:Effective work hardening and incremental plasticity theory for real-time evaluation of the microstructure evolution in rolling process
DESCRIPTION:ABSTRACT
In the present paper is presented a novel physical approach aimed to evaluate the workpiece work hardening during rolling process. The evaluation of the work hardening offers the possibility to build up an incremental plasticity model to be applied for the investigation of microstructure evolution during actual industrial processing. The proposed approach is articulated into two steps: the first step it consists in introducing a new concept: the effective work hardening that includes the sum of two distinct additive contributions: 1) the microscopic work hardening, due to dislocations interaction with forest dislocation and 2) the plastic hardening/softening related to Von Mises plasticity condition under multiaxial stress state. The effective work hardening of the workpiece in the rolling process under plane strain conditions is evaluated on the basis of classic Orowan-Alexander rolling process equation and assuming the normal stress distribution along the roll bite as described by Bland-Ford equations. Following this approach, the equilibrium equation along the contact arc assumes the form of a differential equation (dk/dε)_eff=Ωk relating the effective work hardening with the workpiece yield stress times a factor Ω, named stability function, that is a function of the rolling process parameters and stress-strain path. The second step it consists in the microscopic work hardening evaluation subtracting, from the effective work hardening, the plastic hardening/softening under perfect plastic assumption. 
The novel incremental plasticity approach could be applied to many metallurgical applications such as strip microstructure evolution during hot rolling process, to design optimized rolling schedule, to investigate on strip failure in rolling process by plastic stability/instability analysis and finally to realize a smart rolling sensor. 

  
KEYWORDS: Effective work hardening, incremental plasticity, stress-strain path, plastic stability, smart rolling. 

CLASS:PUBLIC
DTSTART:20230614T155000
DTEND:20230614T161000
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