CAJ | 학술논문

利用碳氮共渗处理方法对 Ti-6Al-4V 合金表面进行改性，制备出了硬质涂层。利用 SEM、EDS、XRD 和 Vickers 显微硬度仪分别对处理后试样表面形貌和显微结构、化学组成、显微硬度进行了表征，并利用空蚀设备研究了处理后试样的空蚀行为。结果表明通过碳氮共渗处理在 Ti-6Al-4V 合金表面形成了均匀、致密、无裂纹的硬质涂层。该涂层具有的细晶结构，在空蚀过程中增加了裂纹萌生难度和扩展路径，减小了裂纹尖端应力和裂纹扩展速率，使其能够吸收、耗散更多的空蚀破坏能量，从而显著地改善了 Ti-6Al-4V 合金的耐空蚀性能。
이용탄담공삼처리방법대 Ti-6Al-4V 합금표면진행개성，제비출료경질도층。이용 SEM、EDS、XRD 화 Vickers 현미경도의분별대처리후시양표면형모화현미결구、화학조성、현미경도진행료표정，병이용공식설비연구료처리후시양적공식행위。결과표명통과탄담공삼처리재 Ti-6Al-4V 합금표면형성료균균、치밀、무렬문적경질도층。해도층구유적세정결구，재공식과정중증가료렬문맹생난도화확전로경，감소료렬문첨단응력화렬문확전속솔，사기능구흡수、모산경다적공식파배능량，종이현저지개선료 Ti-6Al-4V 합금적내공식성능。
Carbo-nitriding treatments were performed to modify the surface of the Ti-6Al-4V alloy and prepare a hard coating on the surface of the alloy.Surface morphology,microstructure,composition and vickers micro-hardness of the coating were characterized by SEM,EDS,XRD and vickers hardness testing.Subsequently,the effect of the carbo-nitriding treatments on the cavitation erosion behavior of the Ti-6Al-4V alloy was studied by an ultrasonic vibratory apparatus.The results exhibited that a dense,free-crack and hard Ti(C,N)coating was formed on the surface of the alloy samples.The coating with a fine microstructure can suppress the crack initia-tion at the surface,increase the crack propagation path and decay the stress field and crack propagation rate, and then absorb more cavitation energy and increase in the cavitation erosion resistance of Ti-6Al-4V alloy.