Fatigue Crack Growth for Typical CV Siderail Hole-making Processes Applied to Heat-treated Steel (MET1123) and Ultra High Strength Low Alloy Steel (120XF)

2009 ◽  
Author(s):  
Sean Fleming
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Alloy Steel ◽  
High Strength ◽  
Low Alloy Steel ◽  
Treated Steel ◽  
Heat Treated ◽  
Hole Making ◽  
Heat Treated Steel

scholarly journals Influence of Local Properties on Fatigue Crack Growth of Laser Butt Welds in Thin Plates of High-Strength Low-Alloy Steel

2021 ◽  
Vol 11 (16) ◽  
pp. 7346
Author(s):  
Patricio G. Riofrío ◽  
Joel de Jesus ◽  
José A. M. Ferreira ◽  
Carlos Capela
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Alloy Steel ◽  
High Stress ◽  
High Strength ◽  
Thin Plates ◽  
Low Alloy Steel ◽  
Stress Levels ◽  
Local Properties

In this work, local properties such as hardness and fatigue crack grow rate in the heat-affected zone of four laser-welded butt joints in thin high-strength low-alloy steel were examined, so as to explain and predict fatigue lives at high stress levels through the fracture mechanics approach. The different welded series presented a similar fatigue crack growth rate in the heat-affected and fusion zones, but lower than base metal due to the higher hardness of the bainitic­­–martensitic microstructure verified in the welded series. The results showed that at high stress levels in the as-welded condition, the fatigue initiation stage can be neglected and assume some types of cracks, with an initial crack of 0.07 mm and appropriate fatigue crack growth rates, estimates of fatigue life close to the experimental results were obtained.

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