摘要
对3种不同氮含量(0.005%,0.020%,0.050%,均为质量分数)下的12%Cr铁素体耐热钢微观组织和冲击性能进行观察与测试,研究了氮含量对其微观组织和冲击性能的影响.结果表明:当试验钢中氮的质量分数从0.005%增加到0.050%时,其马氏体板条尺寸从468 nm减小到264 nm, MX相(即钒的氮化物)的摩尔分数从0.03%增加到0.26%;当试验钢中氮的质量分数从0.005%增加到0.020%时,第二相析出强化作用明显,其韧脆转变温度升高了10.2℃,高阶能减小了29.8 J;当试验钢中氮的质量分数从0.020%增加到0.050%时,细晶强化作用显著,其韧脆转变温度降低了7.6℃,高阶能增加了19.1 J.
The microstructure and impact properties of 12%Cr ferrite heat-resistant steel with three different nitrogen contents(0.005%,0.020%,0.050%,mass fraction)have been observed and tested to investigate the effect of nitrogen content on its microstructure and impact properties.The results show that when the mass fraction of nitrogen in the test steel increases from 0.005%to 0.050%,the size of martensitic lath decreases from 468 nm to 264 nm,and the mole fraction of MX phase(nitrides of vanadium)increases from 0.03%to 0.26%.When the mass fraction of nitrogen in the test steel increases from 0.005%to 0.020%,the second phase precipitation strengthening effect is significant,and its ductile brittle transition temperature(DBTT)increases by 10.2℃,while the upper shelf energy decreases by 29.8 J.When the mass fraction of nitrogen in the test steel increases from 0.020%to 0.050%,the grain refinement strengthening effect is significant,and the DBTT of the test steel decreases by 7.6℃,while the upper shelf energy increases by 19.1 J.
作者
马廷威
王平
王玉红
郝宪朝
雷腾
Ma Tingwei;Wang Ping;Wang Yuhong;Hao Xianchao;Lei Teng(Institution of Mechanical and Power Engineering,Yingkou Institute of Technology,Yingkou 115014,China;Key Laboratory of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 110819,China;CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)
出处
《材料与冶金学报》
北大核心
2025年第4期387-392,共6页
Journal of Materials and Metallurgy
基金
2023年辽宁省自然科学基金联合基金(面上资助计划)项目(2023-MSLH-320)。
关键词
氮含量
12%Cr铁素体耐热钢
冲击性能
韧脆转变温度
nitrogen content
12%Cr ferritic heat-resistant steel
impact properties
ductile brittle transition temperature
