摘要
通过对3组不同含C、N量12%Cr铁素体耐热钢进行显微组织观察和室温、高温拉伸性能测试,研究了C、N含量对12%Cr铁素体耐热钢显微组织和力学性能的影响。结果表明,当C含量从0.14%增加至0.20%时,试验钢的马氏体板条尺寸减小,δ-铁素体消失,马氏体板条细化作用提升了钢的强度;当N含量从0.004%增加至0.02%时,原奥氏体晶粒尺寸和马氏体板条宽度减小,板条内析出物MX数量增加,固溶强化和第二相强化作用提升了钢的强度,而δ-铁素体降低了钢的强度,C、N含量的变化对塑性影响较小。根据生产实践,C含量降低到0.14%,N含量控制在0.02%时,试验钢的拉伸性能最佳,室温下屈服强度、抗拉强度和断后伸长率分别为573.5 MPa、763.0 MPa和24%;550℃拉伸时屈服强度、抗拉强度和断后伸长率分别为344.5 MPa、414.0 MPa和34%。
Effect of C and N contents on microstructure and mechanical properties of 12%Cr ferritic heat-resistant steel was studied by observing the microstructure and tensile tests at room temperature and high temperature of three groups of 12%Cr ferritic heat resistant steel with different C and N contents.The results show that when the C content increases from 0.14%to 0.20%,the size of martensite laths decreases,δ-ferrite disappears,and the effect of martensite lath refinement improves the strength of the steel.When the N content increases from 0.004%to 0.02%,the prior austenite grain size and martensite lath width decrease,and the number of MX precipitates in the laths increases.The solution strengthening and the second phase strengthening enhance the strength of the steel,while theδ-ferrite reduces the strength,and the change of C and N contents has little effect on the plasticity.According to production practice,when the C content is reduced to 0.14%and the N content is controlled at 0.02%,the tensile properties of the tested steel is optimal.The yield strength,tensile strength and elongation at room temperature are 573.5 MPa,763.0 MPa,and 24%,respectively.When the tensile test temperature is 550℃,the yield strength,tensile strength,and elongation are 344.5 MPa,414.0 MPa,and 34%,respectively.
作者
马廷威
郝宪朝
王平
朱静怡
Ma Tingwei;Hao Xianchao;Wang Ping;Zhu Jingyi(Institution of Mechanical and Power Engineering,Yingkou Institute of Technology,Yingkou Liaoning 115014,China;CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang Liaoning 110016,China;Key Laboratory of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang Liaoning 110819,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2024年第12期169-174,共6页
Heat Treatment of Metals
基金
2023年辽宁省自然科学基金联合基金(面上计划项目)(2023-MSLH-320)。
