Kumar, G and Kumar, Ashok and Bar, H N and Sivaprasad, S (2019) A comparative assessment of cyclic deformation behavior of SA333 Gr-6 steel at ambient and elevated temperatures. International Journals of Material Research, 110(11) . pp. 1000-1009.
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The aim of this investigation is to study the comparative cyclic deformation behavior of SA333 Gr-6 steel at two different temperatures. Strain-controlled low cycle fatigue experiments were carried out at 1 × 10–3 s–1 strain rate at room temperature and 300 °C. Cyclic hardening of the steel was observed at both the temperatures. However, greater cyclic hardening was observed at 300 °C for all the strain amplitudes. Non-Masing behavior was observed at both the temperatures. Greater deviation from Masing behavior was observed at 300 °C due to generation of more dislocation activities. Higher dislocation density and sub-cell structure formation is associated with the hardening characteristic of the material. Lower fatigue lives were observed for all strain amplitudes at 300 °C in comparison to room temperature. This is due to the deleterious effect of dynamic strain aging, which is activated at 300 °C. The fracture surface reveals that with an increase in strain amplitude the number of crack initiation sites increases and the region decreases, which leads to a reduction in fatigue life.
|Uncontrolled Keywords:||Low cycle fatigue; Cyclic hardening; Non-Masing behavior; Dynamic strain aging; Cell structure;Stress-strain response; plastic-deformation; fatigue behavior; gr.6 steel|
|Divisions:||Material Science and Technology|
|Deposited By:||Sahu A K|
|Deposited On:||24 Jan 2020 17:30|
|Last Modified:||24 Jan 2020 17:30|
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