Stress corrosion cracking of fusion boundary for 316L/52M dissimilar metal weld joints in borated and lithiated high temperature water

2017 ◽  
Vol 120 ◽  
pp. 219-230 ◽  
Author(s):  
Ruolin Zhu ◽  
Jianqiu Wang ◽  
Zhiming Zhang ◽  
En-Hou Han
Keyword(s):  
High Temperature ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Fusion Boundary ◽  
Dissimilar Metal ◽  
Weld Joints ◽  
High Temperature Water ◽  
Dissimilar Metal Weld ◽  
Metal Weld ◽  
Temperature Water

Stress Corrosion Cracking of the Fusion Boundary for 304L/82 Dissimilar Metal Weld Joint in Simulated Primary Water

CORROSION ◽  
10.5006/3343 ◽  
2019 ◽  
Vol 76 (2) ◽  
pp. 176-187
Author(s):  
Liang Zhao ◽  
Jiamei Wang ◽  
Haozhan Su ◽  
Donghai Du ◽  
Lefu Zhang ◽  
...  
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Heat Affected Zone ◽  
Corrosion Cracking ◽  
Intergranular Cracking ◽  
Fusion Boundary ◽  
Dissimilar Metal ◽  
Primary Water ◽  
Dissimilar Metal Weld ◽  
Metal Weld

The stress corrosion cracking behavior of the fusion boundary for 304L/82 dissimilar metal weld joint was studied in simulated primary water. Analytical electron microscopy was utilized to characterize the cracking features. Results demonstrated that the heat-affected zone in Type 304L has a higher stress corrosion cracking susceptibility and the crack propagated from weld region to Type 304L heat-affected zone in the form of intergranular cracking. The electron back-scattered diffraction and transmission electron microscopy–electron dispersive x-ray spectroscopy results showed that the intergranular cracking in the heat-affected zone of Type 304L was caused by the high residual strain rather than grain boundary Cr-depletion in front of the crack tip. The suppressed crack growth rate in hydrogenated water was attributed to the stable Cr-rich oxide formed at crack tip.

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