Scientific journal
Scientific Review. Technical science
ISSN 2500-0799
ПИ №ФС77-57440

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ORIENTATION DEPENDENCE OF DEFORMATION MECHANISM OF HADFIELD STEEL SINGLE CRYSTALS UNDER UNIAXIAL COMPRESSION

Melnikov E.V. 1 Astafurova E.G. 1
1 Institute of Strength Physics and Materials Science
Using single crystalline specimens of austenitic Hadfield steel oriented along crystallographical directions of <001>, <111>, <113>, <123>, <144>, <012>, the investigation of the deformation mechanism (slip or twinning), stages of plastic flow and evolution of deformation traces on surfaces of the specimens under uniaxial compression at room temperature was carried out. The orientation dependence of the critical resolved shear stresses was revealed, which arises because of orientation dependence of dislocation splitting under applied stress field. The strong orientation dependence of the deformation mechanism and a tendency to localization of plastic flow was determined experimentally. The correlation between a formation of macro shear bands, deformation mechanism and number of shear systems was shown. Multiple slip from the very beginning of plastic flow promotes a nucleation of the macro shear bands, but mechanical twinning suppresses their development.