Effects of Mo and Ni on the thermal conductivity of compacted graphite iron at elevated temperature

Abstract

ABSTRACTThe effects of Mo and Ni on the microstructure and properties of compacted graphite iron were investigated experimentally, especially with regard to the thermal conductivity at elevated temperature. It was found that the ferrite fraction is weakly affected by Mo content but significantly reduced by Ni addition. Moderate content of Mo is beneficial to the tensile strength and the elongation, but it is detrimental for the thermal conductivity, which is more obvious than Ni. The phenomenon that thermal conductivity increases and then decreases at elevated temperature, which is named temperature dependence, could be connected with the lattice distortion of the matrix caused by solute atoms. With the addition of Mo or Ni, the rising amplitude of thermal conductivity increases as well as the temperature corresponding to the maximal of thermal conductivity. Besides, the effects of Mo on the temperature dependence of thermal conductivity are higher when compared with Ni.