X90管线钢连续冷却组织转变与性能研究  

Research on continuous cooling micro-structure transformation and properties of X90 pipeline steel

作　　者：满忠青 储双杰[1,2] 曹能[2] 刘硕[2] 

机构地区：[1]上海交通大学,上海200240 [2]宝山钢铁股份有限公司,上海201900

出　　处：《宝钢技术》2016年第1期28-31,35,共5页Baosteel Technology

摘　　要：利用Gleeble-3500热模拟试验机,通过热膨胀法测得了X90管线钢不同t8/5下的材料膨胀量曲线,结合维氏硬度测试和金相分析结果,绘制了其SH-CCT曲线。同时分析了不同t8/5下X90管线钢的组织、维氏硬度、-10℃低温冲击韧性的变化规律。研究结果表明,随t8/5增加,X90管线钢的室温组织依次转变为LB、GB、F＋P组织;维氏硬度和-10℃的冲击功都随t8/5增大而减小;从母材和热影响区硬度、冲击韧性的匹配角度考虑,推荐焊接时的参数t8/5为10～30 s。The dilatometric curves at different t8 /5after welding were measured by thermal expansion method in Gleeble-3500 thermo simulator,together with hardness test and microstructure analysis by optical microscopy（ OM）,the simulated HAZ continuous cooling transformation（ SHCCT） curve of X90 pipeline steel was established. And then the varies of microstructure,hardness,impact toughness at- 10 ℃ with different t8 /5were analysed. The results showed that the roomtemperature microstructure of X90 pipeline steel varied from LB,GB to F ＋ P with the increase of t8 /5; vickers hardness and impact toughness at- 10 ℃ decreased when t8 /5got larger; the recommended welding parameter t8 /5was 10- 30 s in consideration of the matching of base metal and HAZ in hardness and impact toughness.

关 键 词：X90 管线钢 SH-CCT t8/5 热影响区 性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]