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通过稀土硅铁合金炉前孕育和热处理工艺改善碳化物形态分布及基体组织的强韧性,从而获得性能较为优越的低铬白口铸铁,对其进行断裂韧性测定和较系统的冲蚀磨损试验.结果表明:孕育处理使碳化物由连续网状分布转变为断续网状分布,同时细化了晶粒,导致断裂韧性K_(IC)的提高;并改善其冲蚀抗力;且表现为磨料越硬效果越显著,说明磨料硬度对低铬白口铸铁冲蚀抗力有显著影响:当磨料为较软的玻璃砂时,冲蚀抗力随材料基体硬度的提高而提高;当磨料为硬的碳化硅时,冲蚀抗力随断裂韧性K_(IC)的提高而提高;当材料硬度相近时,则断裂韧性越高,越耐冲蚀.文中结合冲蚀断口的扫描电镜观察及残留奥氏体转变量的X射线测定对试验结果及冲蚀机理进行了分析讨论.
The rare-chromium white cast iron with better performance was obtained through the precooking and heat treatment process of rare earth ferrosilicon alloy furnace to improve the distribution of carbide shape and the toughness of the matrix, and the fracture toughness and the systematic erosion wear test were obtained. The results showed that: the inoculation process changed the carbide distribution from continuous network to intermittent network, meanwhile refined the grains, which led to the improvement of fracture toughness K IC and improved the erosion resistance. The effect is more significant, indicating that abrasive hardness has a significant impact on the erosion resistance of low chromium white cast iron: when the abrasive is softer glass sand, the erosion resistance increases with the increase of the hardness of the material matrix; when the abrasive is hard silicon carbide , The erosion resistance increases with the increase of fracture toughness K IC, and when the hardness of the material is similar, the fracture toughness is higher and the erosion resistance is more resistant to erosion.In this paper, the scanning electron microscopy and residual austenite transformation X-ray analysis of the test results and erosion mechanism were discussed.