The prediction of the occurrence of the delamination in cold drawn hyper-eutectoid steel wires

The effects of mechanical properties and microstructural features such as interlamellar spacing on the occurrence of the delamination in cold drawn hyper-eutectoid steel wires were investigated. Since the cementite dissolution occurred during wire drawing would become one of the main reasons to cause the occurrence of the delamination, the dependence of the occurrence of the delamination on mechanical properties was examined using tensile test and scanning electron microscopy. The results showed that tensile strength would become a proper parameter to predict the occurrence of the delamination in hyper-eutectoid pearlitic carbon steels and Cr-added steels. It was found that while the initial interlamellar spacing showed little influence on the occurrence of the delamination, the Cr addition would improve tensile strength of cold drawn pearlitic steel wires without the occurrence of the delamination.