球墨铸铁在受热状态下的近门槛疲劳断裂研究

A Study of Near Threshold Fatigue Breakdown of Nodular Iron under Condition of Being Heated

对三种球铁进行受热状态下疲劳裂纹扩展门槛值△Kth的测定，以选择最佳成分和工艺制造机车柴油机活塞；并讨论了球铁的成分和组织对△Kth的影响。

The threshold values of extension of fatigue crack △Kth of three types of nodular irons under condition of being heated were determined in order to optimize the compositions and technology for production of locomotive pistons; and the influences of chemical compositions and structures on △Kth were discussed.