Temperature Effects on the Fatigue Behaviour of an Aluminium-Silicon Aloy

1984 ◽  
Vol 8 (3) ◽  
pp. 150-156 ◽  
Author(s):  
L.E. Culver ◽  
J.C. Balthazar ◽  
J.C. Radon
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Temperature Effects ◽  
Room Temperature ◽  
Stress Ratio ◽  
Fatigue Behaviour ◽  
Growth Behaviour ◽  
Crack Growth Behaviour ◽  
Stress Ratios

The fatigue behaviour of BS1490 LM-30 aluminium-silicon alloy has been investigated at room temperature and at a comparatively high temperature of 250°C. ASTM type compact specimens have been used to gather information about the fatigue crack growth behaviour in this cast aluminium alloy at 250°C and a comparison made with the results of simitar tests at 20°C. The effect of stress ratio was investigated and fatigue crack growth thresholds were established for the stress ratios R=0.08, 0.5 and -1.0. The overall appearance of all the fractured surfaces was brittle and fractographic observations showed that the silicon precipitate determines the mode of fracture in the investigated temperature range.

Effect of High Temperature Air-Exposure on Room Temperature Fatigue Crack Growth of Ni-Base Single Crystal Superalloy CMSX-10

2004 ◽  
Vol 261-263 ◽  
pp. 1191-1196
Author(s):  
Y. Iino
Keyword(s):  
Fatigue Crack ◽  
High Temperature ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Room Temperature ◽  
Compact Tension ◽  
Growth Direction ◽  
Growth Behaviour ◽  
Air Exposure ◽  
Crack Growth Behaviour

Room temperature fatigue crack growth behaviour of un-exposed(as-received) and high temperature air-exposed(at 1100°C for 24 to 1000 h) CMSX-10 was investigated. A small compact tension specimen with [001] loading direction and [110] fatigue crack growth direction was used. The fatigue crack growth results were analyzed using a stress intensity parameter K . It is shown that the air-exposure has no deteriorative effect on the crack growth behaviour, even though the microstructure has changed by the exposure(coarsening of γ' ). The crystallographic facet fracture of (1-11) and (-111) planes appeared and the intersection of the planes forms sets of lines(ridge and valley) parallel to [110] direction. The fatigue crack tip front is schematically shown.

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