Activation of a hybrid twinning mechanism in a Cr-Ni-Si-V-N medium manganese austenitic steel containing precipitates. (February 2021)

• Record Type: Journal Article
• Authors: Shyamal, S.; Farahani, M. Ghiasabadi; Allam, T.; Hamada, A.S.; Haase, C.; Kömi, J.I.; Chakraborti, P.C.; Sahu, P.
• Is Part Of: Scripta materialia. Number 192(2021)
• Page Start: 83
• Page End: 88
• Publication Date: 2021-02
• Subjects: medium Mn steels -- precipitates -- transmission electron microscopy -- deformation twinning -- stacking fault energy; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.10.011
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Twinning nucleation in a medium Mn austenitic steel containing precipitates is studied at low strain ~ 0.02, using transmission electron microscopy. In the near vicinity of the precipitates, unfaulting dislocation reaction is favored, while twinning is activated farther from the precipitates. Twin nucleation follows a hybrid mechanism, involving creation of stacking faults through classical dislocation dissociation, while those stacking faults subsequently overlapped following a non-classical alternated stacking fault pair mechanism to create a three-layer twin nucleus. The observed twinning behavior is interpreted from an energy barrier variation viewpoint within the matrix. Graphical abstract: Image, graphical abstract