scholarly journals Fatigue crack propagation properties of HT80 steel welded joints heat treated for relieving residual stresses.

1987 ◽  
Vol 5 (1) ◽  
pp. 126-130 ◽  
Author(s):  
Akihiko Ohta ◽  
Michio Kosuge ◽  
Toshio Mawari ◽  
Nishijima Satoshi
Keyword(s):  
Fatigue Crack ◽  
Residual Stresses ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Welded Joints ◽  
Heat Treated ◽  
Propagation Properties

Effect of Residual Stresses on the Fatigue Crack Propagation in Welded Joints

2005 ◽  
Vol 2 (3) ◽  
pp. 12036 ◽  
Author(s):  
N Gubeljak ◽  
J Predan ◽  
R Pippan ◽  
M Oblak
Keyword(s):  
Fatigue Crack ◽  
Residual Stresses ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Welded Joints

Fatigue Crack Propagation Properties of Welded Joints at 300°C

2003 ◽  
Vol 125 (2) ◽  
pp. 131-135
Author(s):  
Akihiko Ohta ◽  
Naoyuki Suzuki ◽  
Yoshio Maeda
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Welded Joints ◽  
Room Temperature ◽  
Welded Joint ◽  
Type Specimen ◽  
Pressure Vessels ◽  
Fatigue Threshold ◽  
Propagation Properties

Fatigue crack propagation properties of welded joints were investigated on steel plate for boilers and other pressure vessels. The fatigue crack propagation properties at 300°C became similar to those at room temperature when the thermal stress could be reduced down to −1 MPa by using center cracked type specimen with longitudinal slits and a specially designed furnace. The tensile residual stress was +152 MPa in the as-welded joint, and +12 MPa after PWHT. The fatigue threshold was about 2.7, 5.1 and 7.3 MN/m3/2 for weld metal in the as-welded condition, after PWHT and the base metal, respectively.

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