The Effect of Electroplating Alloy on the As-cast Properties of Electric Heating Tubes

The Effect of Electroplating Alloy on the As-cast Properties of Electric Heating Tubes

China has abundant boron reserves, low prices, and stability. Boron in - Fe and - The solubility of Fe is less than 0.0004wt percent and 0.02wt percent respectively. After adding boron into Fe-C alloy, most boron will form boron carbide or precipitate in the form of boride with high hardness and good high-temperature stability during solidification. An increase in boron content can reduce the austenite zone. When the boron content increases to a certain value, the austenite zone shrinks to a certain extent, and there may be no phase transformation at the melting point, which cannot be strengthened by heat treatment. The extent to which boron carbide and boride phase have high wear resistance also depends on the support and wrapping effect of the matrix, that is, the matrix needs a certain hardness and volume percentage. In impact abrasive wear, after the matrix with low hardness is removed, the boron carbide or boride phase protrudes out of the wear surface. Under the repeated extrusion and impact of the abrasive particles, the hard and brittle boron carbide and boride may break, resulting in the decline of the anti abrasive wear performance of the alloy. In addition, if the volume percentage content of the matrix is too low, it will not have a good wrapping effect on the hard phase. In impact abrasive wear, the hard phase will fall off in large particles, which will also lead to a decrease in the alloy's abrasive wear resistance. Therefore, in order to achieve excellent wear resistance in cast Fe-C-B alloys, the matrix must have a certain carbon content and volume percentage content. The existing research mainly focuses on medium and low carbon steel, with a relatively small amount of carbon content added. In order to further investigate the effect of B on the solidification structure and properties of Fe-C-B alloy at high carbon content, this article intends to select a carbon content of about 1.0wt percent for preliminary research.