【摘要】 采用光纤激光器在纯氮气氛围中使用不同的激光线能量在Ti6Al4V合金表面原位合成氮化层．分析了氮化层的微观形貌和物相组成，测试了线能量对氮化层力学性能、磨损性能和耐蚀性的影响．结果表明：线能量为128～180J/mm时制备的氮化层表面无裂纹，其主要物相为TiN相，少量TiN0.3相和α′Ti相．线能量为180J/mm时制备的氮化层具有最高的平均硬度为827.1HV0.3．磨损率较基材降低11.6%～59.8%．线能量为128～200J/mm时制备的氮化层在3.5wt.%NaCl溶液中较基体腐蚀电流密度有所降低，腐蚀电位正移0.012～0.082V，极化电阻提高1.6～3.1倍．更多还原

【Abstract】 Nitriding layer was in-situ synthesized on the surface of Ti6Al4V alloy by fibre fiber laser in a pure nitrogen atmosphere with different laser line energy. The microstructure and phase composition of the nitriding layers were analyzed. And the effects of line energy on the mechanical properties, wear properties, and corrosion resistance of the nitrided layer were tested. The results showed that there is no crack on the surface of the nitrided layer when the line energy is 128～180 J/mm, and the main phase is TiN phase, a small amount of α′-Ti phase and TiN_0.3 phase. The nitrided layer has the highest average hardness of 827.1 HV_0.3 at a line energy of 180 J/mm. The wear rate is 11.6%～59.8 % lower than that of the substrate. In 3.5 wt.% NaCl solution, the corrosion current density of the nitrided layer prepared at the line energy of 128～200 J/mm is lower than that of the substrate, the corrosiona potential is positively shifted by 0.012～0.082 V, and the polarization resistance is increased by 1.6～3.1 times.更多还原