Influence of deep cryogenic treatment on internal friction behavior in the process of tempering

This paper investigated the influence of deep cryogenic treatment on the internal friction behaviors in the process of tempering. The internal friction indicates the carbon atoms segregated to nearby dislocations and produced strong interactions, including interstitial carbon atoms themselves and between the interstitial carbon atoms with time-dependent strain field of dislocations. It is made clear that the cluster of carbon atoms nearby the dislocations in the DCT either acts as or grows into nuclei for the formation of carbide on subsequent during tempering. Thus the improvement of wear resistance due to more carbides precipitation after DCT treating has been observed indirectly by using internal friction.