Severe Plastic Deformation of Large‐Scale Nb‐Microalloyed Steel Billet by Multi‐Directional Forging Process

The microstructural and the tensile properties of Nb‐microalloyed steel billet subjected to severe deformation processing were investigated. The steel samples in the form of as‐cast were severely deformed using multi‐directional hot forging process to approximately accumulated strain (∼4). The microstructure and tensile properties of multi‐directional forging samples were compared with those of the unidirectional forging (UDF) samples. Both optical and scanning electron microscopy examinations showed that the grain size is smaller after multi‐directional forging in comparison with UDF. In addition, the microstructure appears to be more homogeneous and generally more equiaxed after multi‐directional forging processing.

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