Effect of carburising on geometrical control during quenching of martensitic sheet steel channels

The impact of component orientation and selective carburising is examined on the distortion during quenching of post-forming heat-treated (PFHT) channels using three different strength martensitic steel grades. The results show that the minimal, though unpredictable distortion that occurred during quenching of uncarburised channels was confined to either an opening or closing of the channel wall angle. It is also shown that selective carburising on a given surface of the channel will cause a significant change in the shape of the channel during quenching, which is related to the depth of carburising.