The monotonic stress-strain, low cycle fatigue (LCF) and thermomechanical fatigue (TMF) behaviour of a Ti-46.5at.%-4at.%(Cr,Nb,Ta,B) alloy ingot metallurgically processed was investigated in the temperature ränge between 773 K and 1023 K. The ductile-to-brittle transition temperature (DBTT) was found to be 923 K. The cyclic stress-strain (CSS) response of LCF-tested specimens is characterized by an immediate state of cyclic Saturation which continued up to failure. An increased fatigue life which is observed at elevated temperatur.e is associated with a change of the fracture morphology from a transgranular cleavage type of fracture to a more dimple intergranular type. IP loaded specimens show the onset of dynamic recrystallisation which leads to an increased fatigue life äs compared to LCF tests carried out at maximum temperature. OP loading is most detrimental with a well-reduced fatigue life, when compared to LCF tests carried out at the minimum temperature.
Thermomechanical fatigue behaviour of a gamma-TiAl sheet material
Mechanische Eigenschaften von Blechen aus einer TiAl-Legierung in Zugversuchen und Lastwechselversuchen bei Temperaturen im Bereich von 500 bis 750 Grad C
2005
6 Seiten, 8 Bilder, 13 Quellen
Aufsatz (Konferenz)
Englisch
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