Ti合金化钢连铸坯高温力学性能研究

Research on the High Temperature Mechanical Properties of Ti Alloyed Steel Continuous Casting Billets

摘要: 利用Gleeble-2000热/力模拟试验机，研究了Ti合金化高强集装箱用钢BG550C连铸坯的高温力学性能，获得600℃~1400℃范围内铸坯的高温抗拉强度、断面收缩率随温度变化的基本规律。根据数据分析结果表明：高温抗拉强度随温度升高而降低，当温度超过1000℃以上，铸坯的抗拉强度基本上小于10 MPa，说明在高温下铸坯抵抗外力的能力较差；该钢种的塑性区温度范围880℃~1300℃，当温度超过960℃时，断面收缩率均 > 85%，脆性区温度范围600℃~850℃，断面收缩率 < 60%，脆性区温度较窄，铸坯具有良好的塑性，可以承受一定的塑性变形。根据高温拉伸试验结果制定合理的二冷冷却制度，为Ti合金化钢连铸坯生产提供理论依据。

Abstract: The Gleeble-2000 thermal/force simulation test machine was used to study the high temperature mechanical properties of Ti alloyed steel continuous casting billet, and the basic law of high tem-perature tensile strength and section shrinkage rate with temperature in the range of 600˚C~1400˚C was obtained. The results of data analysis show that the tensile strength of high temperature decreases with the increase of temperature. When the temperature exceeds 1000˚C, the tensile strength of the cast billet is less than 10 MPa, indicating that the casting billet is less able to resist external force at high temperature; the plastic zone temperature range of the steel is 880˚C~1300˚C, and the shrinkage rate of the section when the temperature is over 960˚C. The temperature range of the brittle zone is 85%, the temperature range of the brittle zone is 600˚C~850˚C, the shrinkage of the section is less than 60%, the temperature of the brittle zone is narrow, and the cast billet has good plasticity, which can bear a certain plastic deformation. According to the results of high temperature tensile test, a reasonable two cooling system is worked out to provide a theoretical basis for the production of Ti alloyed steel continuous casting billets.