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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。
The inner wall of N80 tubing was laser fused by 5kW cross-flow CO2 laser. The microstructure, hardness and wear morphology of the laser fused layer were analyzed by optical microscope, scanning electron microscope and microhardness tester. The results show that martensitic structure is formed in the fusion zone after laser tube fusion and the hardness is significantly higher than that of the matrix. The maximum hardness appears in the phase transformation hardening zone. After the inner wall of the tubing is fused by the helical helix, the wear resistance is obviously improved. When the scanning speed is constant, with the laser power increases, the hardness decreases, while the corrosion resistance and wear resistance increased corrosion accelerated the wear and tear of the tubing. N80 tubing without laser treatment wear mechanism for the large pieces of the fatigue spalling and plowing, using spiral laser fused, the tubing wear surface furrows small, with a small amount of peel pit.