Abstract
The friction-welded structural steel was subjected to severe plastic deformation by equal-channel angular pressing (ECAP) at ambient condition. Mechanical properties have been experimentally determined and correlated with the microstructure. The friction-welded sample strength got improved up to 70% by ECAP process. In ECAP-processed sample, microhardness survey showed almost similar trend of hardness in all the area of the sample. From the microstructural and TEM analysis, it was understood that the grain refinement and dislocation density have contributed to the strengthening. The generated dislocation density by ECAP process was high in base material than the welded zone and the observation was attested by TEM analysis.
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