Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1573471 | Materials Science and Engineering: A | 2016 | 12 Pages |
Abstract
Low cycle fatigue behavior of titanium alloy Timetal 834 has been studied at 300 °C, 450 °C and 600 °C under fully reversed constant total strain amplitudes (Îεt/2) ranging from 0.4% to 1.2%. The alloy exhibited initial cyclic softening followed by cyclic hardening at 450 °C for Îεt/2â¥0.4% while at 300 °C and 600 °C, cyclic softening followed by cyclic stability was noticed in the cyclic stress response curves for Îεt/2>0.4%. Precipitate shearing was observed to be the micro-mechanism responsible for cyclic softening at all test temperatures. However, dislocation-dislocation and dislocation - solute interaction was observed to be the micro-mechanism responsible for cyclic hardening only at 450 °C. TEM observations revealed that the severity of planar slip is found to peak at 450 °C.
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Authors
Kartik Prasad, Rajdeep Sarkar, Vikas Kumar, K. Bhanu Sankara Rao, M. Sundararaman,