稀土对X80管线钢中铌元素赋存状态的影响  

Effect of Rare Earths on the Occurrence of Nb in X80 Pipeline Steel

作　　者：刘宏亮[1] 刘承军[1] 王云盛[2] 李春龙[2] 姜茂发[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004 [2]包头钢铁(集团)有限责任公司技术中心,内蒙古包头014010

出　　处：《稀土》2011年第5期6-11,共6页Chinese Rare Earths

基　　金：国家科技支撑项目(2008BAB32B07);教育部科技重点项目(109048);中央高校基本业务费项目(N090402017;N100702002)

摘　　要：采用真空感应炉冶炼制备添加微量稀土的X80管线钢,通过FactSage软件计算,不同温度时效处理后显微硬度的测量,结合微观组织分析,研究加热过程中稀土对铌溶解行为的影响;利用MMS-200热模拟试验机测定PTT曲线,研究稀土对铌应变诱导析出行为的影响。结果表明,稀土微合金促进X80管线钢奥氏体中铌溶解,抑制奥氏体中铌应变诱导析出,但稀土微合金增加了铌元素在铁素体中沉淀析出量,理论上可部分替代钢中的钒元素。The X80 pipeline steel with rare earths（RE） alloying was produced by vacuum induction furnace.The relationship between RE and the dissolution behavior of Nb during reheating was studied through factsage software,microstructure analysis and Vickers hardness measurement.Further more,the simulation test machine（MMS-200） was used to obtain the PTT curve of Nb,and the effect of RE on the behavior of strain-induced precipitation of Nb was analyzed.The results indicate that rare earths induce the Nb dissolution and inhibit the strain-induced precipitation of Nb in austenite instead of in ferrite.Theoretically,a partial substitution of V by RE and Nb is possible.

关 键 词：稀土 铌 X80管线钢 析出相 

分 类 号：TG142.1[一般工业技术—材料科学与工程]