激光熔凝处理N80油管的组织及耐磨性  

Structure and wear resistance of N80 oil tubing by laser surface melting

作　　者：李美艳[1] 王勇[1] 马洪伟[2] 韩彬[1] 程义远[1] 

机构地区：[1]中国石油大学(华东)机电学院,山东东营257061 [2]海洋石油工程股份有限公司建造公司焊接实验室,天津300451

出　　处：《金属热处理》2010年第12期44-47,共4页Heat Treatment of Metals

基　　金：山东省自然科学基金(Y2006F64)

摘　　要：采用5kW横流CO2激光器对N80油管内壁进行激光螺旋熔凝处理,采用光学显微镜、扫描电镜及显微硬度计对激光熔凝层组织、硬度及磨损形貌进行分析。结果表明,油管激光熔凝处理后熔凝区生成马氏体组织,硬度较基体显著提高,硬度最大值出现在相变硬化区。油管内壁激光螺旋熔凝强化后,耐磨性能明显提高。当扫描速度一定时,随激光功率的增加,硬度降低,而耐蚀性及耐磨性增加,腐蚀加速了油管的磨损。未经激光处理的N80油管钢磨损机制为大块的疲劳剥落和犁削,采用螺旋激光熔凝处理后,油管磨损面犁沟细小,伴随少量的剥落坑。Laser surface melting （LSM） was performed spirally on the inside surface of N80 oil tubing steel.The structure, hardness and wear morphology were analysed by optical microscope, scanning electronic microscope and hardness tester.The results show that after laser surface melting the microstructure of melted zone of N80 steel is martensite, and the hardness is improved obviously with the highest hardness in phase transformation hardening zone.The wear resistance of N80 oil tubing steel improves significantly by spirally laser surface melting.When the laser scanning velocity is constant with increasing the laser power, the hardness decreases but the corrosion resistance and wear resistance increase.The wear mechanism of the as-received N80 oil tubing steel is fatigue spalling and plough wear.The wear surface of the laser melted steel exhibits fine plough and less spalling pit.

关 键 词：N80油管钢 激光熔凝 组织 耐磨性 耐蚀性 

分 类 号：TG156.99[金属学及工艺—热处理]