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一、引言高铬铸铁作为耐磨材料已广泛应用于电力、建材和矿山等部门。影响高铬铸铁寿命的因素除了材质本身的问题外,铸件内部质量亦是一个重要因素。许多高铬铸铁件虽在材质方面均达到工况要求,但由于内部存在着收缩缺陷,使得材质本身的优势未能很好发挥,服役期间发生断裂、破碎或局部地区很不耐磨,这在高铬铸铁衬板、磨球等铸件中常有所见。所以如何获得健全的高铬铸铁件便成为生产和科研部门关心的问题。由于高铬铸铁较倾向于糊状凝固,补缩阻力较大;另外凝固过程中不发生膨胀现象;因此更需强
I. Introduction High-chromium cast iron as a wear-resistant material has been widely used in electric power, building materials and mining and other departments. Factors affecting the life of high chromium cast iron In addition to the material itself, the quality of the interior of the casting is also an important factor. Although many high-chromium cast iron parts meet the working conditions in terms of materials, due to the internal shrinkage defects, the advantages of the material itself can not be well exerted. Breakage, breakage or wear resistance is noticed in some areas during service High chromium cast iron lining, grinding balls and other castings often see. So how to get a sound piece of high chrome cast iron has become a concern for production and research departments. As the high-chromium cast iron is more inclined to pasty coagulation, shrinkage larger resistance; other solidification process does not occur in the expansion phenomenon;