Effects of cyclic temperature range on thermo-mechanical fatigue behavior of Ti-6-22-22 alloy

Chin J Mater Res

2004, Vol. 18

Issue (2): 139-143 DOI:

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Effects of cyclic temperature range on thermo-mechanical fatigue behavior of Ti-6-22-22 alloy

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;. Effects of cyclic temperature range on thermo-mechanical fatigue behavior of Ti-6-22-22 alloy. Chin J Mater Res, 2004, 18(2): 139-143.

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Abstract The thermo--mechanical fatigue (TMF) behaviors of Ti--6--22--22 alloy were investigated in full reverse mechanical strain control in the temperature ranges from 200 to 400℃ and 200 to 520℃. Experimental results indicate that from 200 to 400℃, the fatigue lifes of in phase and out of phase are longer than that of isothermal fatigue (IF) at 400℃; from 200℃ to 520℃, the fatigue life of out--of--phase is much shorter than that of IF at 520℃. The amplitude of cyclic stress of TMF is related to the maximum and minimum temperatures of TMF in the two cyclic temperature ranges. Observations of fracture surface by longitudinal sections by metallography reveal that longer surface cracks appear under IF at 520℃. The reason for obvious detrimental effects of TMF may result from the enhanced environmental damage due to the increase of cyclic temperature range.

Key words: metallic materials Ti-6-22-22 thermo-mechanical fatigue isothermal fatigue inphase out of phase

Received: 21 May 2004

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