以消失模铸造工艺生产的液-液复合锤头为研究对象,利用万能试验机、扫描电镜和显微硬度仪对复合锤头的界面特征进行了研究。结果表明,复合锤头结合界面为冶金结合,合金元素在高温熔融状态下相互扩散,造成材料硬度的平缓过渡,高铬铸铁部分硬度值为55~60 HRC,碳钢部分硬度值为40~50 HRC。 The liquid-liquid composite hammer produced by lost foam casting process was taken as the research object. The interface characteristics of the compound hammerhead were studied by universal testing machine, scanning electron microscope and microhardness tester. The results show that the interface of composite hammerhead is metallurgical bonding, the alloying elements diffuse into each other under the high temperature melting condition, resulting in a smooth transition of hardness. The hardness value of high chromium cast iron is 55-60 HRC and the hardness value of carbon steel is 40-50 HRC.