The effect of small amounts of Al and Si on the superplastic behavior of a hypoeutectoid high carbon steel

In this study, the superplasticity of a hypoeutectoid carbon steel with 0.7% C was investigated considering Al and Si contents. The hot-tension experiments (superplasticity experiments) were carried out at 650 and 730 °C with the deformation rates between 3.3×10−4 and 1.3×10−2 s−1. The results showed that the best superplasticity elongation of 290% was achieved with the specimen containing 0.6% Si. The maximum m-values were determined as 0.29 at the test temperature of 650 °C and in the deformation rate range of 1×10−3 to 1.3×10−2 s−1 in the specimen with 0.6% Si content and 0.53 at the test temperature of 730 °C and the deformation rate range of 1×10−3 to 1.3×10−2 s−1 in the specimen with 0.15% Al content.