Formability Evaluation of EN-10149-2 (S700mc) Steel Under In-Plane Plane Stretching Condition

Abstract

The current effort is intended to evaluate the forming behavior of the EN-10149-2 (S700mc) steel of 2.42 mm thickness under in-plane plane-stretching (IPPS) condition at ambient conditions. EN-10149-2 (S700mc) steel has good mechanical properties and lightweight that increase the application in automotive, aerospace, and industrial structural design compared to other metals. For which, the tensile and plain stretching test samples were prepared in three rolling directions 0°, 45°, and 90°. The mechanical properties such as the yield strength, tensile strength, uniform elongation, total elongation, hardening exponent (n-value), material strength coefficient (K) and plastic strain ratio (R-value) of EN-10149-2 (S700mc) steel are evaluated from the tensile testing. The microstructure and hardness of the material were also evaluated. IPPS evaluation test has been carried out by stamping circular grids at the middle of the specimen by which measured the manor and major strain using thickness gradient necking criterion (TGNC). The obtained results from experiments found that the maximum limit strain is appeared for the rolling direction of 45° and followed by 90° and 0°. This indicates that the maximum formability is in 45° rolling direction during the IPPS test.