CAJ | 학술논문

利用高速冲蚀试验系统，以7μm、10μm、14μm多角氧化铝微粒为冲蚀颗粒，在120~210 m/s冲击速度范围内，对离心式压缩机叶轮材料FV520B在模拟压缩机叶轮高速粒子冲蚀环境下的冲蚀规律进行了系统的试验研究。对冲蚀表面形貌进行分析，研究冲蚀磨损机理。结果表明：参与冲蚀的粒子质量在5~80 g之间时，冲蚀率先增加后减小即为冲蚀过渡期，冲蚀粒子质量大于80 g后冲蚀率趋于平稳，进入冲蚀稳定期；高、低强度的两种FV520B材料，均呈现出典型的塑性材料的冲蚀特性，最大冲蚀率分别出现在24°、18°的冲击角度附近；高强度FV520B在24°和90°冲击角度时的速度指数分别为3.37和3.68，速度指数随冲击角度的增大而增大；FV520B冲蚀磨损的实质是微切削与变形磨损共同作用，在低角度冲蚀时，以微切削磨损为主，而在大于60°的高角度冲蚀，以变形磨损为主。
이용고속충식시험계통，이7μm、10μm、14μm다각양화려미립위충식과립，재120~210 m/s충격속도범위내，대리심식압축궤협륜재료FV520B재모의압축궤협륜고속입자충식배경하적충식규률진행료계통적시험연구。대충식표면형모진행분석，연구충식마손궤리。결과표명：삼여충식적입자질량재5~80 g지간시，충식솔선증가후감소즉위충식과도기，충식입자질량대우80 g후충식솔추우평은，진입충식은정기；고、저강도적량충FV520B재료，균정현출전형적소성재료적충식특성，최대충식솔분별출현재24°、18°적충격각도부근；고강도FV520B재24°화90°충격각도시적속도지수분별위3.37화3.68，속도지수수충격각도적증대이증대；FV520B충식마손적실질시미절삭여변형마손공동작용，재저각도충식시，이미절삭마손위주，이재대우60°적고각도충식，이변형마손위주。
The solid particle erosion experiments of impeller’s material FV520B in centrifugal compressor are carried out on the high-speed erosion experimental system with simulating the impeller’s actual working conditions. Erosion tests are conducted with alumina particles of 7 μm to 14 μm at impact velocities from 120 m/s to 210 m/s. The erosion behaviors of FV520B are studied systematically. The erosion mechanism is investigated by micromorphology analysis. The results show that, it is the transition period of erosion, when the particle mass is between 5-80 g. When the particle mass is greater than 80 g, erosion rate becomes stabilized, it is the stable period of erosion. High-strength and low-strength FV520B materials both exhibit the erosion characteristics of typical plastic materials, their highest erosion rate occurs at the impact angle of 24° and 18°, the lowest erosion rate occurs at normal impact angle. The velocity index of high strength FV520B at the impact angle 24° and 90° are 3.37 and 3.68, it grows as the impact angle increases. The erosion mechanism of FV520B is microcutting and deformation wear, at low impact angles, the erosion is dominated by microcutting and microploughing, while at high impact angle greater than 60°, the erosion is dominated by deformation wear.