EFFECT OF Mg AND Zr ADDITION ON CREEP CRACK GROWTH BEHAVIOUR OF A Ni-BASE SUPERALLOY
GUO Encai;XU Fengqin Central Iron and Steel Research Institute; Ministry Metallurgical Industry Beijing
Cite this article:
GUO Encai;XU Fengqin Central Iron and Steel Research Institute; Ministry Metallurgical Industry Beijing. EFFECT OF Mg AND Zr ADDITION ON CREEP CRACK GROWTH BEHAVIOUR OF A Ni-BASE SUPERALLOY. Acta Metall Sin, 1988, 24(5): 366-372.
Abstract 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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