Effect of vanadium on microstructure and high temperature properties of fire-resistant steels
LIU qing-chun1,2,YONG qi-long1,ZHENG zhi-wang2
1. School of Materials and Engineering, Kunming University of Science and Technology,Kunming 650093, Yunnan,China 2. State Key laboratory of V and Ti Resources Comprehensive Utilization,Panzhihua Group Research Institute Co.,Ltd.,Panzhihua 617000,Sichuan,China
Abstract:The combined addition of molybdenum and niobium is usually applied to produce fire-resistant steels with appropriate controlled rolling and controlled cooling. Methods, such as electron microscope, phase analysis, tensile test, three dimension atom probe and so on were used to investigate the effect of vanadium on the microstructure and tensile properties at both room temperature and high temperature up to 600 ℃ for every kinds of hot-rolling process in vanadium-containing fire-resistant weathering steels. The relationship between the microstructure and the mechanical properties was analyzed. It has been found that the amount of vanadium precipitates would be finer and denser as the amount of adding vanadium rised. The effect of vanadium depends on the control of the bainite fraction in the microstructure, which is essential for tested steels to obtain good high-temperature yield strength and high yield strength ratio (YS ratio). Vanadium exists mainly in the proeutectoid ferrite in the hot rolled fire resistant steel, the "hidden" vanadium precipitated from the base microstructure when the temperature was elevated to 600 ℃, the high temperature properties of the test samples would be improved simultaneously.
收稿日期: 2016-01-14
出版日期: 2016-07-11
引用本文:
刘庆春,雍岐龙,郑之旺. 钒对耐火钢显微组织及高温性能的影响[J]. 钢铁, 2016, 51(7): 76-80.
LIU qing-chun,,YONG qi-long,ZHENG zhi-wang. Effect of vanadium on microstructure and high temperature properties of fire-resistant steels. Iron and Steel, 2016, 51(7): 76-80.