Nb、V对X80热煨弯管用钢组织与性能的影响  

Effect of Nb and V on the microstructures and properties of X80 hot pipe steel

作　　者：安涛 刘文月 李天怡 臧岩 李江文 孙美慧 AN Tao;LIU Wenyue;LI Tianyi;ZANG Yan;LI Jiangwen;SUN Meihui(State Key Laboratory of Metal Materials for Marine Equipment and Application,Anshan 114009,Liaoning,China;Ansteel Beijing Research Institute Co.,Ltd.,Beijing 102200,China)

机构地区：[1]海洋装备用金属材料及其应用国家重点实验室,辽宁鞍山114009 [2]鞍钢集团北京研究院有限公司,北京102200

出　　处：《钢铁钒钛》2025年第1期178-183,共6页Iron Steel Vanadium Titanium

摘　　要：设计在X80热煨弯管用钢中添加不同含量的微合金元素Nb、V,并采用OM、SEM、TEM进行试样微观组织和析出相的观察,利用拉伸试验机和冲击试验机进行力学性能的测试,应用Thermo-calc软件进行试验钢热力学计算。结果表明:减少试验钢中的Nb或V含量后,试验钢的固溶强化分量降低;纳米析出相的体积分数增加,平均直径减小,试验钢的析出强化分量提高;细晶强化分量相差不大,最终试验钢的屈服强度和抗拉强度降低,而试验钢在-20℃的冲击功显著提高。研究证实,添加约0.02%Nb、0.04%V元素有助于改善X80热煨弯管用钢材料的强韧性匹配。In this study,different contents of micro-alloying elements Nb and V were added to X80 pipeline steel.OM,SEM and TEM were used to observe the microstructures and precipitates.Tensile tests and Charpy tests were conducted to obtain the mechanical properties.Thermo-calc software was used for phase transformation calculation.The results showed that after reducing the Nb or V contents in the tested steel,the ratio of solid solution strengthening of the steel decreased;the volume fractions of the nano precipitates increased;the average diameters of the nano precipitates decreased;the ratio of precipitation strengthening of the tested steel increased;and the ratio of grain refinement strengthening of the steel was not obvious.Finally the strength of the tested steel was reduced,while the impact energy at-20℃was significantly increased.This research has confirmed that adding appropriate amounts of 0.02%Nb and 0.04%V elements can improve the strength and toughness matching of materials.

关 键 词：热煨弯管 Nb、V复合微合金化 微观组织 力学性能 析出相 

分 类 号：TF76[冶金工程—钢铁冶金] TG142[一般工业技术—材料科学与工程]