| Popis: |
High-temperature creep in Ti-5-1 (Grade 5 according to ASTM B265) titanium alloy samples under stepwise heating to temperatures of 1323 K at nominal tensile strains of up to 9.36 MРa in air and hydrogen environments is experimentally studied. The studies have shown that, ceteris paribus, creep rate is lower in hydrogen than in air in most part of the test temperature range. When heating is performed in hydrogen, there is a local zone of increased creep rate. It has been found that heating in hydrogen, as compared to heating in air, decreases conventional creep strength, the nominal stresses being the same in the whole test temperature range. For the studied environments, empirical factors in the Dorn relationship relating short-term creep rate to temperature, nominal stresses, and activation energy have been found, as well as experimental coefficients in the dependence determining creep deformation onset temperature. |
