High-temperature tensile testing of AH36 material in a wide range of temperatures (1173–1573 K) and strain rates (10−4–10−2 s−1) has been obtained by using a Gleeble system. These experimental stress-strain data have been adopted to develop the constitutive equation. The constitutive equation of AH36 material was suggested based on the modified Arrhenius-type equation and the modified Rossard equation respectively. The results indicate that the constitutive equation is strongly influenced by temperature and strain, especially strain. Moreover, there is a good agreement between the predicted data of the modified Arrhenius-type equation and the experimental results when the strain is greater than 0.02. There is also good agreement between the predicted data of the Rossard equation and the experimental results when the strain is less than 0.02. Therefore, a coupled equation where the modified Arrhenius-type equation and Rossard equation are combined has been proposed to describe the constitutive equation of AH36 material according to the different strain values in order to improve the accuracy. The correlation coefficient between the computed and experimental flow stress data was 0.998. The minimum value of the average absolute relative error shows the high accuracy of the coupled equation compared with the two modified equations.
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
A detailed understanding of the constitutive behavior of AH36 material in continuous casting process was obtained through various high-temperature tensile testing at specific ranges of temperatures (1173-1673 K) and strain rates (10 24-10 22 s 21) using a Gleeble system. A significant variation in flow stress is evident over the entire range of temperatures under different strain rates. The constitutive equation of the AH36 material was suggested based on the timehardening model. The results indicate that the accuracy of the model is relatively low at the temperatures of 1173, 1573, and 1673 K under the strain rates of 10 22 and 10 24 s 21. Therefore, a modification of the time-hardening model was carried out by including the compensation of strain rate in the Zener-Holloman parameter (Z) to improve the accuracy. Furthermore, the deformation process was distributed into the regions of 1173, 1273-1473, and 1573-1673 K based on the exponent of strain rate at different ranges of temperature. The correlation coefficient between the computed and experimental flow stress data is 0.998. The average absolute relative error is within the range of allowable experimental conditions.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.