Impact of Friction Stir Welding on the Microstructure and Microtexture of Ferritic-Martensitic HT9 Steel
Ray, L. L.
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Ferritic-martensitic steels are a key material class for structural components in both fission and fusion reactors. Joining components using fusion welding; however, can create problems including material softening, residual stresses, porosity, etc. Friction stir welding (FSW) has been shown as an effective joining mechanism for a host of engineering materials including, more recently, some steels. The processing-microstructure relationships for high chromium, ferritic-martensitic steels have not yet been established. In particular, the effect of varying FSW parameters on the evolution of microstructure has not been addressed. In this research, electron backscatter diffraction (EBSD) and optical microscopy were used to characterize the impact of FSW upon the microstructure of a modified HT9 steel for three different welding conditions of increasing heat input.
The article of record as published may be found at https://doi.org/10.1017/S1431927613005709
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