EFFECT OF Mg AND Zr ADDITION ON CREEP CRACK GROWTH BEHAVIOUR OF A Ni-BASE SUPERALLOY

Abstract

Abstract: The creep crack growth(CCG)and the time to carck initiation and rupture of specimen (t_(rc)and t_r)were measured by means of electrical potential method on single edge notched specimens at 700℃.The field near the crack tip under steady-state creep was represented by energy rate integral(C~*),and the CCG rate as a function of C~* has been obtained.The agreement between the predicted and observed t_(rc)values is quite good.It was found that the addition of small amount of Mg and Zr in the alloys causes t_(rc)and t_r of the specimens to in- crease significantly.

Key words: Ni-base alloy, Mg, Zr, creep crack growth rate, single edge notched, specimen

GUO Encai XU Fengqin Central Iron and Steel Research Institute,Ministry of Metallurgical Industry,Beijing,China GUO Encai,Dept.No.5,Central Iron and Steel Research Institute,Ministry of Metallurgical Industry,Beijing,China. EFFECT OF Mg AND Zr ADDITION ON CREEP CRACK GROWTH BEHAVIOUR OF A Ni-BASE SUPERALLOY[J]. Acta Metallurgica Sinica (English Letters), 1989, 2(2): 147-152.

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EFFECT OF Mg AND Zr ADDITION ON CREEP CRACK GROWTH BEHAVIOUR OF A Ni-BASE SUPERALLOY

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