采用电位法测定单边切口试样700℃下的蠕变裂纹生长,并测定裂纹起始寿命和断裂寿命(t_(rc)和t_r)。用能量率积分(C~*)描述稳态蠕变条件下裂纹顶端附近的场。给出裂纹长大速率与C~*的函数关系,预报的裂纹起始时间与实测值相符。发现合金中加入少量Mg和Zr可以大大延长蠕变裂纹起始寿命和蠕变断裂寿命。
The growth rate of creep cracks and the times to initiation of crackand to rupture of specimen (t_(rc) and t_r) were measured by means of electrical poten-tial method using single edge-notched specimens at 700℃. The field near the cracktip under steady-state creep was represented by energy rate integral (C), and thegrowth rate as a function of C has been obtained. The agreement between the pre-dicted and observed t_(rc) values is quite good. It was found that the addition ofsmall amounts of Mg and Zr causes t_(rc) and t_r of the specimens to increase signifi-cantly.
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| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] |
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