Evolution of fatigue crack growth and fracture behavior in gamma titanium aluminide Ti-43.5Al-4Nb-1Mo-0.1B (TNM) forgings

2018 ◽  
Vol 111 ◽  
pp. 54-69 ◽  
Author(s):  
Matthew S. Dahar ◽  
Sesh A. Tamirisakandala ◽  
John J. Lewandowski
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Titanium Aluminide ◽  
Fracture Behavior ◽  
Gamma Titanium Aluminide ◽  
Gamma Titanium

scholarly journals The effect of notch size on fatigue crack threshold and propagation in cast gamma titanium aluminide

2020 ◽  
Vol 321 ◽  
pp. 08006
Author(s):  
Claire Trant ◽  
Nigel Martin ◽  
Mark Dixon ◽  
Edward Saunders ◽  
Trevor Lindley ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Crack Growth ◽  
Titanium Aluminide ◽  
Gamma Titanium Aluminide ◽  
Gamma Titanium ◽  
Fracture Surfaces ◽  
Notched Specimens ◽  
Diamond Blade ◽  
Process Route ◽  
Growth Threshold

Cracks were initiated and grown from notched specimens with notch lengths of 0.03 (FIB), 0.06, 0.1 and 0.5 mm (diamond blade), in cast gamma titanium aluminide at 400 oC. Specimens with longer 0.1 and 0.5 mm notches initiated from the notch and show no effect from initial notch size on either crack growth threshold or propagation. Specimens with shorter 0.03 and 0.06 mm notches initiated naturally, cracking from microstructural features away from the notch. The fracture surfaces of these specimens were characterised to distinguish areas of initiation, fatigue and overload. Multiple initiation sites were observed on these fracture surfaces. It is inferred that, for this alloy and process route, microstructural initiation is dominant where notches are less than ~100 µm in size.

Fatigue crack growth and fracture behavior of as-cast Ti-43.5Al-4Nb-1Mo-0.1B (TNM) compared to Ti-48Al-2Nb-2Cr (4822)

2017 ◽  
Vol 91 ◽  
pp. 158-168 ◽  
Author(s):  
Matthew S. Dahar ◽  
Sesh A. Tamirisakandala ◽  
John J. Lewandowski
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Fracture Behavior

Tensile Fracture Behavior of a Cast Gamma-Titanium Aluminide

1990 ◽  
Vol 213 ◽  
Author(s):  
V. Seetharaman ◽  
R. L. Goetz ◽  
S. L. Semiatin
Keyword(s):  
Titanium Aluminide ◽  
Fracture Behavior ◽  
Tensile Fracture ◽  
Intergranular Cracking ◽  
Gamma Titanium Aluminide ◽  
Gamma Titanium ◽  
Titanium Aluminide Alloy ◽  
Tension Testing ◽  
Open Die Forging ◽  
Deformation Modes

ABSTRACTThe fracture behavior of a cast gamma-titanium-aluminide alloy (Ti-49.5A1–2.5Nb-l. 1Mn) during deformation processing was investigated using hot-tension testing and isothermal-forging experiments. In uniaxial tension, fracture ductility increased with an increase in the test temperature and a decrease in the imposed strain rate. During open-die forging of this alloy under isothermal conditions, tensile stresses generated due to frictional effects and the associated inhomogeneous plastic deformation led to free-surface fracture via intergranular cracking. The failure observations under these two deformation modes were correlated successfully using a tensile-damage criterion.

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