Strain-controlled out-of-phase thermo-mechanical fatigue tests at 100-500 °C and various strain ranges were conducted on five cast iron grades, including one lamellar, three compacted and one spheroidal graphite iron. Investigations of graphite morphology and matrix characteristics was performed to associate parameters, such as geometrical features of graphite inclusions and the matrix microhardness, to the thermo-mechanical fatigue performance of each grade. From this, thermo-mechanical fatigue life as a function of maximum stress at half-life, is found to decrease consistently with increasing average graphite inclusion length irrespective of the graphite content. In contrast, no evident correlation between the fatigue life and the matrix microhardness is observed.

在五种铸铁牌号上进行了在100-500°C和不同应变范围下的应变控制异相热机械疲劳测试，其中包括一个层状，三个压实和一个球墨铸铁。进行了石墨形态和基体特性研究，以将诸如石墨夹杂物的几何特征和基体显微硬度之类的参数与各个等级的热机械疲劳性能相关联。由此发现，与平均石墨夹杂物长度的增加无关，作为半衰期最大应力的函数的热机械疲劳寿命随着石墨平均含量的增加而持续降低。相反，在疲劳寿命和基体显微硬度之间没有观察到明显的相关性。