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.

连铸板坯裂纹缺陷的内在因素是由板坯本身的高温力学性能决定的。目前，热力学性能的测量主要通过Gleeble热拉伸试验来完成。但是，测试过程中样品中温度分布的不均匀肯定会影响所测机械性能的准确性。为了获得准确的高温机械性能，对拉伸试样中温度分布及其对机械性能的影响的研究具有重要意义。本文建立了热拉伸试验中铸态钢试样的三维电磁模型和焦耳三维热模型，研究了试样的电流密度和温度分布。发现当测试温度为1300℃时，钢试样的表面和中心之间的温差达到62℃。使用平均绝对差法来校准温度的不均匀分布。与原始测试相比，随着测试温度从800°C升高到1300°C，标定测试和原始测试之间的拉伸强度差异从26 MPa降低到10 MPa。