|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Mechanical and Creep Behavior of Advanced Materials: A SMD Symposium Honoring Prof. K. Linga Murty
||L-115: Understanding of Microstructure and Mechanical Properties of Friction Stir Processed Aluminum-bearing High-Chromium Ferritic Stainless Steel
||Anumat Sittiho, Vedavyas Tungala, Indrajit Charit, Rajiv S. Mishra
|On-Site Speaker (Planned)
There are many issues that affect performance of fusion welds in high-Cr ferritic steels. Friction stir welding (FSW) can be developed as a promising solid state welding technique. Here FSW is applied to a Kanthal APMT steel (Fe-22Cr-5Al-3Mo) plate in a bead-on-plate configuration using a tool rotation rate of 600 rpm and traverse speed of 25.4 mm/min. Vickers microhardness testing across the weld zone did not reveal any significant change. Optical microscopy and transmission electron microscopy are conducted to characterize the microstructure in different regions of the weld (base material, HAZ, TMAZ). The stir zone contains an equiaxed grain structure with a mean grain size of 21 μm. Dispersed particles in the stir zone are found to have coarsened compared to the base material. Furthermore, tensile testing across the weld is performed. Correlations between the microstructure and mechanical properties are established by elucidating the underlying strengthening mechanisms.
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