研究了定向凝固合金DZ125 850℃时不同保载时间作用下的低循环疲劳行为.进行了拉伸保载时间分别为1s,60s,120B和240s的试验,并进行了循环应力-应变分析、应变响应分析、疲劳寿命分析以及微观断口分析,结果表明,保载时间对低循环疲劳力学行为有明显影响,随着保载时间的增加疲劳寿命逐渐减小,但保载时间超过一定范围之后疲劳寿命趋于稳定,而且随保载时间的增加蠕变损伤逐渐起主导作用.
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