高层建筑用耐火钢的组织与性能  

Microstructure and properties of fire-resistant steel for high rise building

作　　者：刘程鹏[1] 牟洪仲[1] 

机构地区：[1]贵州师范大学材料与建筑工程学院,贵州贵阳550001

出　　处：《金属热处理》2014年第5期94-97,共4页Heat Treatment of Metals

基　　金：贵州省科技厅-贵州师范大学联合科学技术基金(黔科合J字LKS[2012]03号)

摘　　要：以添加微合金化元素Mo的低碳建筑用钢为研究对象,研究了正火温度与正火保温时间对常温力学性能与高温力学性能的影响,采用金相显微镜和扫描电镜分析了热处理过程中微观组织的变化,并探讨了Mo元素的存在形式与作用机理。结果表明,随着正火温度的升高,试验用钢的抗拉强度与屈服强度逐渐降低,而伸长率不断上升,屈强比也不断降低;随着正火时间的延长,试验用钢的抗拉强度与屈服强度变化较小,而伸长率有较大幅度的升高。Taking a low carbon steel added with micro-alloying Mo as the research object , effects of normalizing temperature and holding time on mechanical properties at room temperature and high-temperature mechanical properties of the Mo micro-alloyed low carbon construction refractory steel were investigated .The microstructure evolution during heat treatment was analyzed by metallographic microscope , scanning electron microscope and transmission electron microscope , and the existence form and action mechanism of Mo element were discussed .The results show that , with the increase of normalizing temperature , the tensile strength and yield strength decrease , the elongation increases , and the yield ratio also decreases; with prolonging the normalizing time , the tensile strength and yield strength change a little , but the elongation increases greatly .

关 键 词：建筑用钢 耐火 组织 力学性能 

分 类 号：TU511.3[建筑科学—建筑技术科学]