Publications

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

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

SCRIPTA MATERIALIA
Volume: 207 Pages:
DOI: 10.1016/j.scriptamat.2021.114306
Published: 2022

Abstract
The microhardness distribution in the different zones of a friction stir welded reduced activation ferritic/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. © 2021

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