高碳高铬钢/含铬灰铸铁离心复合界面的研究

Centrifugally Compounded Interface Between High Carbide High Chromium Steel and Chromium-Bearing Grey Cast Iron

通过正交设计实验优化得到了高碳高铬钢、含铬灰铸铁的最优成分;采用卧式悬臂离心实验机对高碳高铬钢/含铬灰铸铁进行离心复合·在复合成功的基础上,利用金相显微镜对不同实验条件下的复合界面进行了对比、分析·结果表明:经离心复合铸造,高碳高铬钢/含铬灰铸铁复合界面为结合紧密的复合层;复合试样经1080℃保温1h,水淬+500℃回火1h处理后,复合界面碳化物扩散更充分,但对复合界面宽度没有影响;浇注温度提高,复合界面宽度增加,当高碳高铬钢液浇注温度由1460℃提高到1480℃时,复合界面宽度增加了100μm·

The chemical compositions of high carbide high chromium steel and chromium-bearing grey cast iron were optimized through orthogonally designed experiments which were carried out on a horizontal cantilevered centrifugal machine to compound the steel and cast iron by way of a centrifugal casting process. According to different experimental conditions, the successfully compounded interfaces were carefully compared with each other and analyzed by microscopy. The results indicated that a compact compound layer as the interface is found between the steel and cast iron. After water quenching at 1 080 ℃ for 1hr then tempering at 500 ℃ for 1 hr, although the carbides in the interface diffuse better, they do not affect the interface width. However the higher the casting temperature is, the wider the interface will be, if the casting temperature of the steel increases up to 1 480 ℃ from 1 460 ℃, the interface width will increase by 100 μm.