from the conferences organized by TANGER Ltd.
The effects of a combined addition of 0.039 % P + 0.015 % Ag as well as a nominal addition of 0.1 % of the de-embrittling elements of copper – B, Mg, Ca, Ti and Zr – to give some variations in contents within the DHP-Cu specification limits on grain size structure at a casting temperature of 1130 °C have been determined and compared to those without the microalloying addition of Ag of 0.015 % obtained at a casting temperature of 1150 °C under TP-1 casting conditions. These results showed that on decreasing the casting temperature from 1150 °C to 1130 °C, the degree of CET increased for DHP-Cu reference with and without microalloying with Ag; the microalloying addition of Ag of 0.015 % to DHP-Cu was essential for grain size control; and that, in comparison to the corresponding DHP-Cu reference cast at 1150 °C and 1130 °C, no further grain refining action was observed due to B, Mg, Ca, Ti and Zr microalloying additions for the conditions studied.
Keywords: DHP copper, oxygen free copper, columnar to equiaxed transition, grain refinement, grain growth restriction, de-embrittlement© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.