Difference in warm deformation was investigated for 0.45C, 0.79C and 1.26C steels with martensite starting structure, using the Gleeble 3500 thermal-mechanical simulator. The temperature range was 873-973 K, and the strain rate was varied between 0.1 and 0.001 s-1. The results showed the decrease of deformation resistance with increasing carbon content. The peak stress of 1.26C steel decreased 16.2% compared with 0.45C steel under the same conditions. The effect of increasing carbon content on the activation energy of deformation, the Z value and the deformation resistance was analyzed. The phenomenon might be attributed to the weakening effect of solid solution strengthening outweighing precipitation strengthening.
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