摘要
为探究铈对重轨钢U75V性能的影响,采用真空感应炉冶炼三炉稀土重轨钢,分别为未加铈的G1、铈含量为22μg/g的G2和铈含量为46μg/g的G3,通过扫描电镜、冲击试验机、美特斯万能试验机、盐雾腐蚀试验箱等仪器测试了含铈重轨钢的冲击功、抗拉强度等性能,并进行理论分析,使用X射线衍射仪、Jade 6.5软件对锈层进行物相分析。结果表明,随着铈含量的增加,抗拉强度小幅度提高,G3试验钢的伸长率最大,为10.7%,其拉伸断口中心位置有少量韧窝出现,表明铈的加入提高了钢的强韧性。G3试验钢冲击吸收功最大,为4.5 J,与G1相比,冲击吸收功增加了1.05 J,说明微量铈可以提升试验钢的室温冲击韧性。在盐雾腐蚀试验中,平均腐蚀速率分别为4.281 g/(m^(2)·h)、4.076 g/(m^(2)·h)、3.077 g/(m^(2)·h),腐蚀120 h时,G3试验钢相比其他试验钢γ-FeOOH含量减少,α-FeOOH含量增加,耐腐蚀性能最好。
In order to explore the effect of rare earth Ce on the performance of heavy rail steel U75V, three rare earth heavy rail steels were smelted by using vacuum induction furnace, and were coded as G1 without rare earth, G2 with a rare earth content of 22 μg/g and G3 with a rare earth content of 46 μg/g, respectively. Scanning electron microscope, impact testing machine, MTS universal testing machine, salt spray corrosion testing machine and other instruments were used to test the impact energy, tensile strength and other properties of heavy rail steel containing rare earth Ce, and theoretical analysis was carried out. X-ray diffractometer and Jade 6.5 software were applied to phase analysis of the rust layer. The results show that with the increase of rare earth content, the tensile strength increased slightly, and the elongation of the test steel G3 was the largest, with 10.7%,and there were a few dimples in the center of the tensile fracture, which shows that the addition of rare earth Ce improves the strength and toughness of steel.The test steel G3 has the largest impact absorption energy of 4.5 J,and compared with G1,the impact absorption energy has increased by 1.05 J, meaning a small amount of rare earth Ce can improve the room temperature impact toughness of the test steel.In the salt spray corrosion test, the corrosion products are all α-FeOOH,Fe_(3)O_(4),γ-FeOOH and a small amount of β-FeOOH.The average corrosion rates for test steels G1, G2 and G3 are 4.281 g/(m^(2)·h), 4.076 g/(m^(2)·h), 3.077 g/(m^(2)·h), respectively. When corrosion time is 120 h, γ-FeOOH content decreased and α-FeOOH content increased for G3 compared with other test steels, and the corrosion resistance is the best.
作者
樊志明
杨吉春
李向川
张滢
FAN Zhi-ming;YANG Ji-chun;LI Xiang-chuan;ZHANG Ying(School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,China;Baotou Tianhe Magnetic Materials Technology Co.,Ltd.,Baotou 014000,China)
出处
《稀土》
CSCD
北大核心
2023年第6期87-97,I0005,共12页
Chinese Rare Earths
基金
国家自然科学基金项目(51774190)。
关键词
重轨钢
铈
力学性能
腐蚀速率
夹杂物
heavy rail steel
rare earth Ce
mechanical properties
corrosion rate
inclusions
