Numerical analysis of highly reactive interfaces in processing of nanocrystallised multilayered metallic materials by using duplex technique

•Nanocrystallised multilayered materials were examined.•The behaviour of the highly reactive interfaces was investigated.•Multi-level thermomechanically coupled finite element based model was developed.•Strain, stress and damage evolution around oxidised interface were analysed.•It has been shown that the oxide scale failed during the rolling pass.

The behaviour of the highly reactive interfaces during the processing of nanocrystallised multilayered materials has been investigated in the present work. Conditions leading to the formation of strain localisations around the oxidised interfaces during the thermomechanical stage of the duplex processing route have been investigated using multilevel numerical analysis. The analysis is based on the finite element methodology and involved coupling of the macro level model representing the rolling of the multilayered metallic material at elevated temperatures with the meso level model representing the oxidised interface within the nanocrystallised material. The multilevel thermomechanical model has been applied for the analysis of the strain, stress and damage evolution around the oxidised interfaces for the different technological parameters. The analysis included verification of the modelling results with the available experimental material. The 316L stainless steel is considered in the investigation.