Residual stress-induced deformation and fatigue crack growth in weld-repaired high-strength low-alloy steel with soft buffer layer

2013 ◽  
Vol 564 ◽  
pp. 147-157 ◽  
Author(s):  
Chunguo Zhang ◽  
Pengmin Lu ◽  
Xiaozhi Hu ◽  
Xuding Song
Keyword(s):  
Residual Stress ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Buffer Layer ◽  
Alloy Steel ◽  
High Strength ◽  
Low Alloy Steel

Effect of Buffer Layer Thickness on Fatigue and Residual Stress of Welded High-Strength Low-Alloy

2013 ◽  
Vol 820 ◽  
pp. 110-113
Author(s):  
Chun Guo Zhang ◽  
Peng Min Lu ◽  
Jun Hong Li
Keyword(s):  
Residual Stress ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Buffer Layer ◽  
Hsla Steel ◽  
High Strength ◽  
Compact Tension ◽  
Compact Tension Specimen ◽  
Before And After

The present work dealt with the fatigue and residual stress (RS) effects of a soft buffer layer (BL) between the parent metal and the weld metal (WM) on welded high-strength low-alloy (HSLA) steel. Six strategies were pursued by varying BL thickness and changing U-notch position with respect to the WM in extended-compact tension specimen. The U-notch position was changed to study the effect of welding RS field, acting along the fatigue crack growth path. The welded HSLAs with BLs strategies were compared to the specimens without BLs strategies, before and after releasing RS respectively. The results demonstrated that the incorporation of a thin BL of 4 mm significantly reduced the fatigue crack growth rate (da/dN) when the RS in the welded HSLA was released by machining a U-notch in the WM. A thick BL of 10 mm was found to be beneficial to fatigue resistance when a U-notch was in the PM.

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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