Heating Simulation of Tensile Specimen at Continuous Casting Temperatures

Abstract

Abstract:The heating process and heat preservation of the specimens in Gleeble thermal simulation test machine were simulated. A coupled electrical-thermal model is established by ABAQUS. The internal temperature distributions of the specimen were analyzed. The uniform temperature zone of the specimen under the studied conditions is given. The effects of different temperatures and the time of heat preservation were discussed. The influence of temperature distribution on the tensile test was analyzed.Key words: high temperature, tensile specimen, temperature distribution, uniform temperature zone. 1．IntroductionQuality standard of the continuous casting slabs is sternly developed to meet the performance requirements. However, there are many defects of the slab appeared during the solidification in the continuous casting process, and these defects are closely related to the high temperature mechanical properties of the slab. In order to improve the quality of the slab, the stress-strain behavior of the slab at high temperature should be studied to obtained its high temperature mechanical properties. Because the temperatures involved are quite high, many researchers tend to use the Gleeble test machine to carry out the tensile test [1][2][3][4][5]. Unfortunately, the specimen's temperature after heating is not uniform in Gleeble, which will have a huge impact on the tensile test. Some investigations have took into account this aspect [6,7], but the temperatures considered in former were under 800 K and the latter did not consider the uniform temperature zone.In present study, the Gleeble tensile specimens in the temperature range of 1273 K to 1673 K were simulated by ABAQUS. The distribution of the specimens at high temperature was investigated. Meanwhile, its uniform temperature zone and effects on tensile test were analyzed. 2．The Establishment of The Model Geometric Model and Material ParametersThe heating of the specimen is a thermal-electric coupling problem. Taking into account the used specimen is cylindrical that the diameter is 10 mm and the length is