| Abstract: | The phenomenon of double necking during hot tensile tests is discussed in this work. The investigation was carried out on high-carbon steel using a tensile testing machine equipped with an integral heating system. Tensile tests were performed in a large temperature range to obtain the mechanical characteristic of the material. Microstructure evolution was observed by light microscopy and hardness measurements to determine the position of double zones of necking. A significant increase in flow stress of as-transformed austenite was found to be at the origin of the double necking behaviour. |
