345MPa级别耐火钢高温状态下组织及析出相  

Study of microstructure and precipitate of 345 MPa grade F-R steel on fire simulation

作　　者：刘明[1] 林田子[1] 侯华兴[1] 张涛[1] 

机构地区：[1]鞍钢股份有限公司技术中心,辽宁鞍山114009

出　　处：《辽宁科技大学学报》2013年第2期127-131,共5页Journal of University of Science and Technology Liaoning

摘　　要：为生产出优质耐火建筑用钢,研究345MPa级别耐火钢在高温下组织及析出相的变化对力学性能的影响,重点分析了M-A岛在耐火钢中的作用。结果表明,试验耐火钢的组织由铁素体、少量粒状贝氏体和M-A岛组成的混合组织;试验耐火钢在高温状态下具有稳定性良好的M-A岛和在基体或晶界中析出Nb和Ti的第二相质点,是耐火钢在高温下具有良好性能的重要原因。In order to produce better fire-resistant steel,the effect of the changes of microstructure and precipitate of 345 MPa grade F-R steel on mechanical properties is researched,the effect of M-A island in fire-resistant steel is analyzed.The results show that the microstructure of F-R steels is the mixture of ferrite,little granular bainite and M-A islands.M-A island is stable at high temperature,and second phase particle of Nb and Ti carbonitride is precipitated in the matrix or grain boundary,they are the important reasons for F-R steels with good mechanical properties at high temperature.

关 键 词：耐火钢 高温状态 微观组织 M-A岛 析出相 

分 类 号：TG142.41[一般工业技术—材料科学与工程]