【作者】 刘红艳； 陈子刚； 邓想涛； 王昭东；

【Author】 Liu Hongyan;Chen Zigang;Deng Xiangtao;Wang Zhaodong;Hebei Iron and Steel Group Handan Iron and Steel Company;National Key Laboratory of Rolling Technology and Continuous Rolling Automation, Northeastern University;

【机构】 河钢集团邯钢公司技术中心； 东北大学轧制技术及连轧自动化国家重点试验室；

【摘要】 通过Nb含量对2000MPa马氏体超高强钢微观组织演变的调控作用研究,首次实现2000MPa超高强度F级耐磨钢开发,解决该类产品强硬度高带来的韧性控制难题。研究表明,当Nb含量为0.04、0.03、0.01%时,随着Nb含量增加,原始奥氏体晶粒尺寸由19μm明显细化至8μm,板条束尺寸依次为1.86μm、2.36μm和8.1μm,马氏体块平均宽度分别为0.57μm、1.53μm、2.03μm,大角度晶界所占比例分别为63.5%、59.5%、52.2%,Nb含量的增加大角度晶界比例明显提升,保证了超低温环境中具有良好的韧性。经过200℃回火后-60℃超低温韧性检测,Nb含量为0.040%的NM600-SYA冲击功比NM600-SYB、NM600-SYC两成分高,在35～58J之间,未发生韧脆转变。更多还原

【Abstract】 Through the study of the regulatory effect of Nb content on the microstructure evolution of 2000MPa martensitic ultra-high strength steel, the development of 2000MPa ultra-high strength F-grade wear-resistant steel has been achieved for the first time, solving the toughness control problem caused by the high strength and hardness of this type of product. The research shows that when the Nb content is 0.04, 0.03 and 0.01%, with the increase of Nb content, the original austenite grain size is significantly refined from 19 μ m to 8 μ m, the size of Flat noodles beam is 1.86 μ m, 2.36 μ m and 8.1 μ m in sequence, the average width of martensite block is 0.57 μ m, 1.53 μ m and 2.03 μ m respectively, and the proportion of large angle grain boundaries is 63.5%, 59.5% and 52.2%respectively. With the increase of Nb content, the proportion of large angle grain boundaries is significantly increased, ensuring good toughness in ultra-low temperature environment. After tempering at 200 ℃ and conducting ultra-low temperature toughness testing at-60 ℃, the impact energy of NM600-SYA with a Nb content of 0.040% is higher than that of NM600-SYB and NM600-SYC components, ranging from 35 to 58J, and no ductile brittle transition has occurred.更多还原