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Reduced Dwell-Fatigue Resistance in a Ni-Base Superalloy After Short-Term Thermal Exposure

Magnus Hörnqvist (Institutionen för teknisk fysik, Materialens mikrostruktur ) ; Leif Viskari (Institutionen för teknisk fysik, Materialens mikrostruktur )
Metallurgical and Materials Transactions. A (1073-5623). Vol. 45 (2014), p. 2699-2703.
[Artikel, refereegranskad vetenskaplig]

The effect of short-term thermal exposure on microstructure and dwell-fatigue resistance of Ni-base superalloy 718Plus was investigated. Contrary to previous studies performed after long-term exposure, an increase in the dwell-fatigue crack growth rate was observed, which was connected to a small increase in the size of the hardening precipitates. The proposed controlling mechanism was the stress relaxation rate at the crack tip, and based on this a schematic model for the development of the properties during exposure is presented.



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Denna post skapades 2014-05-20. Senast ändrad 2015-06-12.
CPL Pubid: 198282

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Materialens mikrostruktur (2012-2015)

Ämnesområden

Materialvetenskap
Konstruktionsmaterial
Teknisk fysik

Chalmers infrastruktur