Journal
SCRIPTA MATERIALIA
Volume 169, Issue -, Pages 38-41Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.05.001
Keywords
Grain boundary segregation; Nanoindentation; Ferritic steels; Aging
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Funding
- JSPS KAKENHI [JP15H05768]
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The critical shear stress for dislocation emission at grain boundary was directly measured by nanoindentation technique. The change in the grain boundary strength with low-temperature aging was then discussed. It was found that the critical grain boundary shear stress increased, and the increment was correlated to the amount of carbon segregated at the grain boundary. From the relationship between the lower yield point and the amount of segregated carbon, it was concluded that the Hall-Petch coefficient (k(y)) increased with grain boundary segregation. The validity of the pile-up theory explaining k(y), which depends on the grain boundary strength, was demonstrated. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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