ABSTRACT The 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.

中文翻译：

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Mo和Ni对蠕墨铸铁高温热导率的影响

摘要 通过实验研究了 Mo 和 Ni 对蠕墨铸铁组织和性能的影响，特别是在高温下的热导率方面。结果表明，铁素体分数受 Mo 含量的影响很小，但受 Ni 的影响显着降低。适量的Mo有利于抗拉强度和伸长率，但对热导率不利，这一点比Ni更为明显。热导率随温度升高而先升高后降低的现象称为温度依赖性，可能与溶质原子引起的基体晶格畸变有关。随着Mo或Ni的加入，热导率的上升幅度增加以及对应于热导率最大值的温度。此外，与 Ni 相比，Mo 对热导率的温度依赖性的影响更高。