In order to gain a better understanding of the detrimental effects of grain boundaries on the creep and fatigue life of a nickel based directionally solidified super alloys, the effect of the grain mis-orientation and temperature changes on the internal stresses were investigated. The changes of cooling rate, nuclei count and stress level and components in different parts of the casting were considered during solidification process in a Bridgeman furnace. During solidification, constriction of grain growth in one direction, which is due to the heat transfer direction, eliminates grains with large mis-orientations. The remaining grains are close to [001] direction. Temperature profile of the modeled carrot samples demonstrated a significant variation in the cooling rate along the axis of the sample. The mis-orientation of the grains was also characterized. Stress components and effective stress were calculated and it was shown that the effective stress is lower than the yield stress of the alloy.
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ASME 2018 Pressure Vessels and Piping Conference
July 15–20, 2018
Prague, Czech Republic
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-5163-0
PROCEEDINGS PAPER
Evolution of Temperature, Microstructure and Inter-Granular Stresses During Directionally Solidification Process of a Ni-Based Superalloy
Maryam Torfeh,
Maryam Torfeh
Amirkabir University of Technology, Tehran, Iran
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Jamshid Aghazadeh,
Jamshid Aghazadeh
Amirkabir University of Technology, Tehran, Iran
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Soheil Nakhodchi
Soheil Nakhodchi
K. N. Toosi University of Technology, Tehran, Iran
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Maryam Torfeh
Amirkabir University of Technology, Tehran, Iran
Jamshid Aghazadeh
Amirkabir University of Technology, Tehran, Iran
Soheil Nakhodchi
K. N. Toosi University of Technology, Tehran, Iran
Paper No:
PVP2018-85046, V03BT03A054; 6 pages
Published Online:
October 26, 2018
Citation
Torfeh, M, Aghazadeh, J, & Nakhodchi, S. "Evolution of Temperature, Microstructure and Inter-Granular Stresses During Directionally Solidification Process of a Ni-Based Superalloy." Proceedings of the ASME 2018 Pressure Vessels and Piping Conference. Volume 3B: Design and Analysis. Prague, Czech Republic. July 15–20, 2018. V03BT03A054. ASME. https://doi.org/10.1115/PVP2018-85046
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