ICAMS / Interdisciplinary Centre for Advanced Materials Simulation

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Effect of microstructure heterogeneity on the mechanical properties of friction stir welded reduced activation ferritic/martensitic steel

S. Li, N. Vajragupta, A. Biswas, W. Tang, H. Wang, A. Kostka, X. Yang, A. Hartmaier.

Scripta Materialia, Elsevier Ltd., 207, 114306, (2022)

©2021, ActaMaterialiaInc., Published with permission from Elsevier Ltd., All rights reserved.

Abstract
The microhardness distribution in the different zones of a friction stir welded reduced activation fer- ritic/martensitic steel has been investigated and correlated to the hierarchical martensitic microstructure in the respective zones, characterized by electron backscatter diffraction orientation analysis. It is found that the variation of prior austenite grain size, packet size, and block width in different subzones is influenced by the peak temperature and effective strain rate during the friction stir welding process. The distribution of the microhardness correlates directly with the geometrically necessary dislocation density observed in the different zones. ©


Keyword(s): Reduced activation ferritic/martensitic steel; Friction stir welding; Electron backscatter diffraction orientation analysis; Austenite reconstruction; Geometrically necessary dislocations
DOI: 10.1016/j.scriptamat.2021.114306
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