Dendrite structure and microhardness of as-cast 4Cr5MoSiV1 steel between different homogenisation processes

Abstract

The dendrite structure and hardness of 4Cr5MoSiV1 ingot at different homogenisation processes were studied in order to identify the most efficient and cost-effective heat treatment for this steel. The microsegregation and microhardness were analysed after different soak-times at 800 or 1200°C for single-stage treatments, and for two-stage treatments of different soaking times at both these temperatures. At the single-stage homogenisation treatment, it would be expected that with the increasing of soaking times, the homogenisation effect becoming better, and the higher temperature soak especially so. However, the two-stage homogenisation treatments could be more effective than single-stage treatment at the higher temperature. The two-stage treatments 800°C/3 h + 1200°C/1 h have better homogenisation effect than 1200°C/4 h.