Nb-V复合微合金化高钢级管线钢的奥氏体连续冷却转变  

Continuous cooling transformation of austenite in Nb-V microalloyed high-grade pipeline steel

作　　者：马启林 刘刚[3] 郑健 阴树标[1] 李拔[2] 刘清友[2] Ma Qilin;Liu Gang;Zheng Jian;Yin Shubiao;Li Ba;Liu Qingyou(Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming Yunnan 650031,China;Research Institute of Structural Steels,Central Iron and Steel Research Institute,Beijing 100081,China;China Petroleum Pipeline Engineering Corporation,Langfang Hebei 065000,China;National Pipe Network Construction Project Management Branch Company,Langfang Hebei 065000,China)

机构地区：[1]昆明理工大学冶金与能源工程学院,云南昆明650031 [2]钢铁研究总院工程用钢研究院,北京100081 [3]中国石油天然气管道工程有限公司,河北廊坊065000 [4]国家管网建设项目管理分公司,河北廊坊065000

出　　处：《金属热处理》2022年第1期13-18,共6页Heat Treatment of Metals

基　　金：国家重点研发计划(2018YFC0310303)。

摘　　要：利用热模拟试验机研究了3种不同成分的Nb、V微合金化高钢级管线钢的过冷奥氏体连续冷却转变行为,绘制了动态CCT曲线,分析和比较了3种试验钢的显微组织、显微硬度值和动态CCT曲线。结果表明,0.05Nb-0.03V配比能提高多边形铁素体的开始转变温度,从Nb钢的650~700℃,提高到700~800℃,并缩小多边形铁素体温度转变区间,扩大贝氏体温度转变范围,从Nb钢的400~650℃,扩大到350~680℃,同时抑制多边形铁素体相变,使管线钢更易获得所需的贝氏体针状铁素体组织。Continuous cooling transformation behavior of subcooled austenite of three different Nb, V microalloyed high-grade pipeline steels with different composition was studied by using thermal simulation test machine, dynamic CCT curve was drawn, and three tested steels were analyzed and compared. The microstructure, microhardness value and dynamic CCT curve. The results show that the ratio of 0.05 Nb-0.03 V can increase the starting transformation temperature of polygonal ferrite, from 650-700 ℃ for Nb steel to 700-800 ℃, narrowing the temperature transition range of polygonal ferrite, and expanding bainite temperature transformation range of Nb steel is 400-650 ℃, and it is expanded to 350-680 ℃. At the same time, the polygonal ferrite phase transformation is suppressed, so that the pipeline steel can easily obtain the required bainite acicular ferrite structure.

关 键 词：Nb-V复合微合金化钢 管线钢 动态CCT曲线 第二相析出 

分 类 号：TF704.2[冶金工程—钢铁冶金] TG156[金属学及工艺—热处理]