The investigated results show that all of investigated nodular cast iron has the cyclichardening characteristic.
结果表明，所研究的几种球铁都具有循环硬化特征。
2
The results showed that the characteristics of cyclichardening or softening depend to the strain loading paths and the loading parameters.
研究结果表明，低周拉扭疲劳加载下，拉与扭应力响应的硬化与软化特性取决于应变加载路径和加载参数。
3
Its cyclic properties first show cyclic softening, after stabilizing, then cyclichardening. The state of cyclic softening and cyclichardening will vary along with strain level.