High temperature low-cycle fatigue of an iron-base oxide-dispersion strengthened alloys: Grain structure effects and lifetime correlations

Journal Article · Mon May 01 00:00:00 EDT 1995 · Metallurgical Transactions, A

DOI:https://doi.org/10.1007/BF02670602· OSTI ID:72659

Banhardt, V; Nader, M ^[1]; Arzt, E ^[1]

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1. Max-Planck-Inst. fuer Metallforschung, Stuttgart (Germany)

The high-temperature low-cycle fatigue (LCF) behavior of the new oxide-dispersion strengthened (ODS) alloy PM 2000 is investigated at 1,050 C using symmetrical and asymmetrical wave shapes. The grain structures range from single ``crystals`` (grain size of several centimeters) to polycrystals with an average grain size of less than 30 {mu}m. It is found that the grain structure determines the fracture path but cannot be correlated with cyclic lifetimes. Instead, lifetime can be predicted on the basis of the different Young`s moduli of the grain structures and correlates with the reciprocal of Young`s modulus. A normalization is proposed that condenses all lifetime data, which span two orders of magnitude, into a narrow scatterband.

• Sponsoring Organization: USDOE
• OSTI ID: 72659
• Journal Information: Metallurgical Transactions, A, Vol. 26, Issue 5; Other Information: PBD: May 1995
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
IRON BASE ALLOYS
THERMAL FATIGUE
GRAIN SIZE
CHROMIUM ALLOYS
ALUMINIUM ALLOYS
HEAT RESISTING ALLOYS
DISPERSIONS
YTTRIUM OXIDES
TITANIUM ADDITIONS
SERVICE LIFE
FRACTURE PROPERTIES
EXPERIMENTAL DATA
TEMPERATURE RANGE 1000-4000 K