摘要
采用平衡转变和模拟调质处理的方式,研究了10.5%Cr马氏体耐热钢经720℃等温处理不同时间(30~300 h)后组织遗传的消除规律,采用金相显微镜和扫描电镜对组织及晶粒度进行观察。结果表明,该试验钢平衡组织的转变量对组织遗传的消除有重要影响,等温处理足够长时间(120 h及以上)完全获得平衡组织(等轴铁素体+碳化物)后才能充分消除组织遗传。此外,应确保足够长的等温时间(270 h及以上),以降低平衡组织中碳化物的密集程度差距,使晶界钉扎效果更为均匀,从而实现晶粒的细化和均匀化。
Elimination law of structural heredity in a 9%-12%Cr martensitic heat-resistant steel(with 10.5%Cr)after isothermally treated at 720℃for different time(30-300 h)was studied using equilibrium transformation and simulated quenching and tempering treatment.The microstructure and grain size were observed using metallographic microscope and scanning electron microscope.The results show that the transformation of the equilibrium microstructure in the tested steel has an important impact on the elimination of structural heredity.Only when the isothermal time is long enough(120 h or more)to fully obtain an equilibrium microstructure(equiaxed ferrite+carbides),the structural heredity can be fully eliminated.In addition,a sufficiently long isothermal time(270 h or more)should be ensured to reduce the difference in the local density of carbides in the equilibrium microstructure and make the grain boundary pinning effect more uniform,so as to achieve grain refinement and homogenization.
作者
孙颖
Sun Ying(Metallurgical Engineering Department,Shanxi Engineering Vocational College,Taiyuan Shanxi 030009,China)
出处
《金属热处理》
北大核心
2025年第12期161-166,共6页
Heat Treatment of Metals
基金
山西省自然科学基金面上项目(20210302123163)
山西省高等学校科技创新项目(2022L703)。
关键词
9%~12%Cr耐热钢
等温处理
组织遗传
9%-12%Cr heat-resistant steel
isothermal treatment
structural heredity
