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研究了逆相变退火温度对0.1C5Mn钢连铸坯的组织结构和力学性能的影响规律,采用SEM进行组织结构的表征,利用XRD技术分析连铸坯退火后奥氏体含量,并测试了退火试样的力学拉伸性能。试验结果表明,连铸坯退火过程中发生奥氏体逆转变且在较低退火温度下有少量碳化物析出,随着退火温度升高,奥氏体含量先增加后减少,析出物逐渐溶解消失。提高退火温度可以显著提高试验钢的抗拉强度但却降低它的屈服强度,另外随退火温度升高,断后伸长率和强塑积先增高后降低。在625～650℃退火,可以获得20%～25%的伸长率。研究结果说明利用逆转变退火可以大幅度提高中锰钢铸坯的力学性能。
The effect of annealing temperature on the microstructures and mechanical properties of 0.1C5Mn steel billet was studied. The microstructure of the 0.1C5Mn steel slab was characterized by SEM. The austenite content of the slab after annealing was analyzed by XRD. Tensile properties of the specimen. The results show that austenite reverse transformation occurs during the annealing process and a small amount of carbides precipitate at the lower annealing temperature. As the annealing temperature increases, the austenite content first increases and then decreases, and the precipitates gradually dissolve and disappear . Increasing the annealing temperature can significantly improve the tensile strength of the test steel but reduce its yield strength. In addition, as the annealing temperature increases, the elongation at break and the ductility increase first and then decrease. Annealing at 625 to 650 ° C gives an elongation of 20% to 25%. The results show that the use of reverse conversion annealing can significantly improve the mechanical properties of manganese steel slab.