套管钻井钢显微组织与力学性能关系研究  

Study on relationship between microstructure and mechanical properties of casing-drilling steels

作　　者：许天旱[1] 冯耀荣 雒设计[1] 王党会[1] 杨宝[1] 

机构地区：[1]西安石油大学材料科学与工程学院,陕西西安710065 [2]中国石油集团石油管工程技术研究院,陕西西安710065

出　　处：《材料热处理学报》2015年第9期47-54,共8页Transactions of Materials and Heat Treatment

基　　金：青年科技创新基金项目(Z12180);国家863计划资助项目(2006AA06A107);陕西省材料科学与工程重点学科资助项目(ys32030203)

摘　　要：借助TEM、SEM及疲劳试验机等设备,研究了不同显微组织套管钻井钢组织和力学性能之间的关系。试验结果表明:TM钢是由显微硬度显著更高的近完全回火马氏体构成,PF钢则是由显微硬度较低珠光体和铁素体构成,TM钢和PF钢分别具有更高和更低的硬度和强度。PF钢在冲击载荷下主要以解理方式断裂,而FBM钢和TM钢则主要以延性韧窝方式断裂,FBM钢和TM钢的冲击韧性是PF钢的5倍多。不同显微组织决定疲劳裂纹扩展路径和拉伸性能不同,PF钢具有最大的材料常数m值和最小的C值,TM钢则具有最小材料常数m值和最大的C值。The relationship between microstrueture and mechanical properties of casing-drilling steels was investigated by means of TEM, SEM and fatigue tests. The results show that the microstructure of the steel with tempered martensite （TM steel） possesses remarkable higher strength and higher hardness values, and the lower strength and hardness of the steel with microstructure of ferrite and pearlite （PM steel） is observed. The Charpy energy absorption values of the steel with ferrite-bainite-tempered martensite （FBM steel） and TM steel are five times higher than that of the PF steel, and the impact fracture of PF steel exhibits a cleavage fracture mechanism, whereas that of the FBM steel primarily follows ductile fracture mechanism. The fatigue crack growth paths and tensile properties of the steel are dependent on its microstructure, the PF steel possesses the highest m value and lowest C value in Paris equation, and the TM steel exhibits the lowest m value and highest C value.

关 键 词：套管钻井用钢 显微组织 拉伸特性 冲击特性 疲劳裂纹扩展速率 

分 类 号：TG142.4[一般工业技术—材料科学与工程]