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金属杂质泵等过流元件在双相介质中工作,不仅承受介质中固相的磨料磨损,液相的冲刷,而且受到腐蚀的破坏,即属于低应力冲蚀磨料磨损。材料抵抗这种磨损的性能应归结为抗砂蚀性。本文就钨系铸铁的成分、组织、机械性能和电化学性能对其抗砂蚀性的影响以及磨损机理进行了试验研究。结果表明,增加铸铁的含钨量特别是采用钨、铬多元合金化可提高其抗砂蚀性;其理想组织应为马氏体加弧立状碳化物;铸铁的宏观硬度与抗砂蚀性之间存在较复杂的关系,而提高其耐蚀性将收到显著效果;低应力冲蚀磨损和气蚀磨损综合进行的过程,三者互相促进,但仍以磨料磨损为主。
Metal impurity pumps and other over-current components work in a two-phase medium, not only to withstand the abrasive medium abrasive, liquid erosion, but also by the destruction of corrosion, which belongs to the low stress erosion abrasive wear. The material’s resistance to such wear and tear should be attributed to sand resistance. In this paper, the composition, microstructure, mechanical properties and electrochemical properties of tungsten-based cast iron on its impact resistance and abrasion mechanism were studied. The results show that increasing tungsten content of cast iron, especially tungsten and chromium alloying, can improve its sand resistance; its ideal structure should be martensite plus vertical carbide; macro hardness and sand resistance of cast iron There is a complex relationship between the corrosion resistance and improve its will receive significant results; low stress erosion erosion and cavitation wear comprehensive process, the three promote each other, but still abrasive wear-based.