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  • Prediction of creep behavior of Ni- base Directionally Solidified CM247 superalloy based on continuum damage mechanics approach
Prediction of creep behavior of Ni- base Directionally Solidified CM247 superalloy  based on continuum damage mechanics approach

Prediction of creep behavior of Ni- base Directionally Solidified CM247 superalloy based on continuum damage mechanics approach

Date6th Jul 2020

Time03:00 PM

Venue Online mode Google Meet

PAST EVENT

Details

Creep behaviour of Directionally Solidified (DS) CM 247 nickel base super alloy has been studied at three temperatures viz. 850, 950 and 1050°C and over a range of stresses for both smooth and notched samples of R2, R4, R6 and R8 geometries. Creep curve predictions at unknown stress conditions and three-dimensional (3D) maps of creep curves (creep strain-time-stress) were generated by using the in-house developed code based on theta-projection methodology. These 3D maps with overlaid experimental creep curves show a very good agreement with the predicted creep behavior at different stresses and at a given temperature. Also, the ability of the method in deducing the Stress-relaxation curves at different strains derived from 3D maps of creep curves has been demonstrated. Further, the relative performance of the LMP approach and the theta-projection approach in prediction of time to rupture has been addressed. The second aspect of this study involves establishing methodology for measurement of creep strain/damage evolution using a low frequency alternate current potential drop (ACPD) technique for both smooth and notch specimens, thereby overcoming the limitation of conventional methods of monitoring creep strain/damage accumulation in localized-notched regions. Further, a continuum damage mechanics (CDM) approach using Bonoras damage evolution model based on the principle of strain equivalence along with the damage curves generated using ACPD signatures was adopted for prediction of creep behavior of the superalloy at unknown stress conditions.

Speakers

Mr. C.M. OMPRAKASH, Roll No: MM12D016 (Ph.D Ext)

Department of Metallurgical and Materials Engineering