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

Abstract

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 degreesC with the deformation rates between 3.3 x 10(-4) and 1.3 x 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 degreesC and in the deformation rate range of 1 x 10(-3) to 1.3 x 10(-2) s(-1) in the specimen with 0.6% Si content and 0.53 at the test temperature of 730 degreesC and the deformation rate range of 1 x 10(-3) to 1.3 x 10(-2) s(-1) in the specimen with 0.15% Al content. (C) 2003 Elsevier Science B.V. All rights reserved.