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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
DETERMINATION OF THE MECHANICAL THRESHOLD STRESS IN RELATION TO AUSTENITIC STAINLESS STEEL 00H21AN16G5M4Nb
Faculty of Marine Engineering, Gdynia Maritime University, 81–87 Morska Str., 81–225 Gdynia, Poland
The article presents the results of investigation of austenitic steel 00H21AN16G5M4Nb aimed at determining the dynamic characteristics after static stretching and after stretching to 40 m·s-1. The knowledge of the dynamic characteristics of materials designed for marine structures is necessary for elucidating the behavior of materials on impact loading. At large strain rates the mechanism of plastic strain changes. The influence of nitrogen on the austenitic stainless steel properties was evaluated on the example of steel 00H21AN16G5M4Nb. Austenitic steels demonstrate low stacking fault energy values (SFE) due to the nitrogen content. More effective blocking of dislocations by nitrogen rather than carbon is significant in the processes of shaping the functional properties of austenitic stainless steels. The line graph presenting the dependence of stress on the temperature and strain rate allows graphical representation of change in the yield strength. On the basis of experimental studies, the mechanical threshold stress for steel 00H21AN16G5M4Nb has been determined.
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