Journal
NUCLEAR MATERIALS AND ENERGY
Volume 27, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nme.2021.100944
Keywords
Hastelloy C-276; Annealing treatment; Incoherent Sigma 3 grain boundary; Grain boundary character distribution; EBSD
Categories
Funding
- National Natural Science Foundation of China [50834008, 11972348, U1738108]
- PhD Research Foundation Project of North China Institute of Aerospace Engineering [BKY201702]
- Colleges and Universities in Hebei Province Science and Technology Research Project [ZD2018239]
- Hebei Provincial Key Laboratory of Thermal Protection Materials, China [SZX2020038]
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Reasonable deformation and annealing treatment parameters lead to more incoherent Sigma 3 boundaries playing an important role in the optimization of GBE.
Hastelloy C-276 samples were cold-rolled with their thickness reduction of 7.5% and 15%, and then annealed at 1100 degrees C for 5-60 min in solid solution. The grain boundary character distributions (GBCDs) were characterized by a technique of electron back scatter diffraction (EBSD). Results indicated that, more convoluted Sigma 3 boundaries (i.e. incoherent 13 boundaries) are generated by reasonable annealing time in low strain (7.5%) sample during strain-induced boundary migration (SIBM) processing. They can induce higher Sigma 3(n) fraction and activate more interactions between special boundaries for GBE. Instead, more coherent Sigma 3 boundaries were produced by moderate strain (15%) and annealing treatment with the occurrence of static recrystallization (SRX). The recrystallized fine grains possess fewer incoherent Sigma 3 boundaries cannot promote to get more multiple twinning for optimization of GBCD. Therefore, reasonable deformation and annealing treatment parameters lead to more incoherent Sigma 3 boundaries would play an important role in the optimization of GBE.
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