Cr18Ni3Mn11Cu3NbN不锈钢组织和性能分析  

Microstructure and mechanical property of austenitic steel Cr18Ni3Mn11Cu3NbN

作　　者：李丹[1] 程晓农[1] 姚春发[2] 李冬升[1] 戴起勋[1] 陈祖伟[1] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]钢铁研究总院结构材料研究所,北京100081

出　　处：《江苏大学学报（自然科学版）》2010年第5期549-552,共4页Journal of Jiangsu University：Natural Science Edition

基　　金：江苏省科技成果转化项目(BA2007033);镇江市科技支撑项目(GY2009004)

摘　　要：为研究超临界火电用奥氏体不锈钢Cr18Ni3Mn11Cu3NbN的显微组织和性能,分析了Cr18Ni3Mn11Cu3NbN的金相组织和断口形貌,检测了室温拉伸性能和高温短时拉伸性能.金相组织分析表明,在奥氏体基体中呈弥散分布着NbN化合物,并有少量呈簇状析出,还存在少量高温铁素体和纯Nb相.断口分析表明,室温拉伸断口有明显缩颈,断面形貌呈等轴韧窝状,是韧性断裂.Cr18Ni3Mn11Cu3NbN的室温力学性能满足ASME Code Case 2328-1标准,其中拉伸强度远大于规定值;高温短时拉伸强度大于Super304H奥氏体不锈钢的实测值,但延伸率有一定的差距,主要原因是少量高温铁素体的存在.In order to study the microstructure and mechanical property of a newly developed austenitic stainless steel Cr18Ni3Mn11Cu3NbN,the metallographic microstructure and fracture morphology were analysed,and the short-time tensile properties at room-temperarure and elevated-temperature were also detected.The metallographic analysis showed that NbN compounds were distributed in austenitic matrix,thereinto a few of them were precipitated as cluster.At the same time,a small amount of elevated-temperature ferrite and pure Nb phases were also presented.The fracture analysis showed that equiaxed dimples were at the fracture surface,indicating the existence of toughness fracture.In addition,the room-temperature mechanical properties of the steel could meet the standard ASME Code Case 2328-1,thereinto,its tensile strength was much larger than the standard value,the high-temperature tensile strength was greater than that of the Super304H steel,but the elongation was less because of the existence of a small amount of elevated-temperature ferrite.

关 键 词：奥氏体不锈钢 铁素体 显微组织 强度 超临界 

分 类 号：TG142.1[一般工业技术—材料科学与工程]