碳钢-高铬铸铁离心铸造钻井泵缸套的研究

Steel-high chromium centrifugal cast drill pump liner.

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。

By using ZG200 400 carbon steel for the outer liner and high chromium cast iron for the inside liner, and by means of compound centrifugal cast technology, carbon steel high chromium cast iron drill pump liner is developed. An analysis of samples shows that, the matrix structures of the inside liner are martensite, retained austenite and eutectic carbide, with a hardness of 60～63HRC and a impact toughness of 7～7 5J/cm 2; the interface between the carbon steel and the high chromium cast iron is bonded tightly. It is proved that the compound dual metal centrifugal casting technology is feasible and effective.