CHANGES IN MICROSTRUCTURE AND PROPERTIES OF AUSTENITIC STEEL AISI 316 DURING HIGH-PRESSURE TORSION
Volokitin A. Naizabekov A. Volokitina I. Kolesnikov A.
2022University of Chemical Technology and Metallurgy
Journal of Chemical Technology and Metallurgy
2022#57Issue 4809 - 815 pp.
The effect of high-pressure torsion process in a new die on the structure and mechanical properties of corrosionresistant steel AISI 316 was studied. Deformation was carried out at room temperature, the number of deformation cycles was 7. In the process of high-pressure torsion, the structure of samples is considerably refined to nanostructured, so steel AISI316 with an average grain size of 30 µm after deformation is refined to 80 - 100 nm. The tensile strength and yield strength values increase in seven passes from 595 to 1590 MPa and from 320 to 870 MPa, respectively. Relative elongation changes from 55 to 25 %>, but remains at a sufficient level for an application. The initial structure of nondeformed steel has good ductility and demonstrates typical signs of ductile fracture. But with increasing HPT cycles the fracture mechanism changes from ductile to brittle, indicating a decrease in ductility of stainless steel AISI 316.
austenitic steel , high-pressure torsion , metal , microstructure , severe plastic deformation
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Karaganda State Industrial University, 101400, Republic av. 30, Temirtau, Kazakhstan
Rudny Industrial Institute, 111500 50 let Oktyabrya str. 38, Rudny, Kazakhstan
M. Auezov South Kazakhstan University, 160009 D. Erimbetov str. 38/32, Shymkent, Kazakhstan
Karaganda State Industrial University
Rudny Industrial Institute
M. Auezov South Kazakhstan University
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