Singh, R K and Sahu, J K and Tarafder, S (2016) Strain rate effect on cyclic deformation behaviour of advanced ultra-super critical boiler grade wrought Ni-based superalloy IN740H at 760 °C. Materials Science and Engineering A, 658 (IF-3.094). pp. 272-279.
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In order to understand the simultaneous operation of fatigue and creep mechanisms, strain rate (ε ̇) effect on low cycle fatigue (LCF) behaviour of recently developed power plant grade wrought Ni-based superalloy IN740H was studied. Fatigue experiments were conducted in air, at 760oC at ε ̇ values 10-2, 10-3 and 10-4 s-1. The fatigue life significantly decreased at lower ε ̇ values. Bilinear Coffin-Manson slopes were obtained for all ε ̇ values. Through microstructural studies, it was ascertained that decrease in fatigue life at lower ε ̇ value can be attributed to ingress of oxygen by grain boundary diffusion and intergranular crack initiation and growth.
|Uncontrolled Keywords:||IN740H, Low cycle fatigue, Strain rate, Intergranular fatigue cracks|
|Divisions:||Material Science and Technology|
|Deposited By:||Dr. J K Sahu|
|Deposited On:||09 Mar 2016 14:41|
|Last Modified:||20 Nov 2017 12:59|
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