2007, Vol. 43

Issue (10): 1025-1030 DOI:

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. . Acta Metall Sin, 2007, 43(10): 1025-1030 .

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Abstract Low cycle fatigue tests of cast nickel base superalloy M38 have been conducted at 900℃ in air under fully reversed total strain control, and the strain rate is 1×10-2s-1. After failure, the fracture surfaces and longitudinal sections of the specimens were examined using a scanning electron microscope. Experimental results revealed that the fatigue property of M38 is similar to that of IN738LC. At high strain amplitudes, crack tends to initiate at stress concentration sites such as surface carbides. While at low strain amplitudes, oxidation takes significant effect on crack initiation. The Cr-rich surface-connected grain boundaries (G.B.) and Ti-rich surface-carbides were observed to be favorable crack initiation sites. Under all strain amplitudes, the crack propagation mode is transgranular.

Key words: superalloy high temperature low cycle fatigue fracture mechanism crack initiation and propagation

Received: 12 January 2007

ZTFLH:	TG146.15
	V231.95

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