Temperature Distribution in the As-Cast Steel Specimen During Gleeble Hot-Tensile Test and Its Effect on High-Temperature Mechanical Properties

The intrinsic factor of crack defect in continuous casting slab is determined by the high-temperature mechanical properties of slab itself. At present, the measurement for the thermal mechanical properties is mostly achieved by Gleeble Hot-Tensile test. However, the uneven temperature distribution in the specimen during the test will definitely affect the accuracy of the measured mechanical properties. To acquire accurate high-temperature mechanical properties, studies of the temperature distribution in the tensile specimen and its effect on mechanical properties is significant. In this paper, A three-dimensional electromagnetic model and a three-dimensional Joule thermal model for the as-cast steel specimen in Hot-Tensile test were built to study current density and temperature distribution in the specimen. It was found that temperature difference between surface and center of steel specimen reaches 62 °C, when the test temperature is 1300 °C. An average absolute difference method was used to calibrate the inhomogeneous distribution of temperature. Compared with the original test, the difference of the tensile strength between the calibrated and original test decreased from 26 to 10 MPa with test temperature increasing from 800 °C to 1300 °C.