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.
| Original language | English |
|---|---|
| Article number | 114306 |
| Number of pages | 6 |
| Journal | Scripta Materialia |
| Volume | 207 |
| Early online date | 27 Sept 2021 |
| DOIs | |
| Publication status | Published - 15 Jan 2022 |
| MoE publication type | A1 Journal article-refereed |
Funding
This work is funded by the International Thermonuclear Experimental Reactor (ITER) Program Special Project (granted no. 2015GB119001). Shengli Li would like to thank the financial support from the Chinese Scholarship Council (CSC201906250177), and Dr. Cyril Cayron for the assistance in using the computer program ARPGE.
Keywords
- Austenite reconstruction
- Electron backscatter diffraction orientation analysis
- Friction stir welding
- Geometrically necessary dislocations
- Reduced activation ferritic/martensitic steel
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