Abstract:

The effects of different inoculants on the thermal conductivity of high carbon gray cast iron were studied. DRPL-2C thermal conductivity tester was used to determine the thermal conductivity of gray cast iron at room temperature，WAW-200 tensile testing machine was used to test the tensile strength， XJG-0.5 optical microscope， TESCAN tungsten filament scanning electron microscopy were used for tissue observation， and graphite characteristic parameter statistics （5-8 photos of gray cast iron with different inoculant treatment gray cast iron ） were carried out by using Image-pro plus （IPP）， Photoshop and other software. The results showed that different inoculants had different degrees of influence on the graphite microstructure characteristics （graphite tip morphology， graphite length， graphite quantity and graphite proportion） of high carbon ash cast iron， thereby affecting the thermal conductivity of high carbon ash cast iron. In addition to the content of graphite in gray cast iron， the length of graphite and the amount of graphite also have an important impact on the thermal conductivity of high carbon gray cast iron. Compared with the traditional inoculant， the new inoculant can effectively passivate the tip of the graphite， reduce the size and increase the amount of graphite in the gray cast iron structure， and synergistically improve the tensile strength and thermal conductivity of the gray cast iron， which provides some theoretical guidance for the future application of high-carbon gray cast iron in the field of high-strength and high-thermal conductivity materials.

Key words: metallic materials, high carbon gray cast iron, inoculation, thermal conductivity