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以ZG2 0 0— 4 0 0碳钢为外层套 ,高铬铸铁为内层套 ,采用双液离心铸造复合工艺 ,通过控制铸型转速、内外套浇注温度和时间间隔 ,以及在复合界面加入BN界面复合剂 ,研制出碳钢-高铬铸铁钻井泵缸套。试样分析表明 ,高铬铸铁内套基体组织为马氏体、残留奥氏体及共晶碳化物 ,热处理后硬度 60～ 63HRC ,冲击韧性 7～ 7 5J/cm2 ;碳钢与高铬铸铁复合界面相互嵌入 ,结合牢固 ,冲击试样断口具有大量韧窝 ,韧性良好。以双液离心铸造复合工艺取代热镶装工艺制造双金属缸套 ,工艺切实可行 ,可节约大量人力、物力 ,大幅度降低生产成本。
ZG2 0 0-400 carbon steel as the outer sleeve, high chromium cast iron as the inner sleeve, using double centrifugal casting process, by controlling the mold speed, casting temperature and time interval, and in the composite interface to join BN interface compound, developed a carbon steel - high chromium cast iron drilling pump liner. The sample analysis shows that the matrix structure of high-chromium cast iron inner sleeve is martensite, retained austenite and eutectic carbide. After heat treatment, the hardness is 60-63HRC and the impact toughness is 7-715J / cm2. The carbon steel is compounded with high-chromium cast iron Interfacing with each other, with a solid, impact specimen fracture with a large number of dimples, good toughness. Centrifugal casting process with double liquid composite instead of hot inlay technology to manufacture bimetal cylinder liner, the process is feasible, can save a lot of manpower and material resources, greatly reduce production costs.