In situ corrosion characterization of simulated weld heat affected zone on API X80 pipeline steel

2014 ◽  
Vol 85 ◽  
pp. 401-410 ◽  
Author(s):  
L.W. Wang ◽  
Z.Y. Liu ◽  
Z.Y. Cui ◽  
C.W. Du ◽  
X.H. Wang ◽  
...  
Keyword(s):  
Heat Affected Zone ◽  
Pipeline Steel ◽  
X80 Pipeline Steel ◽  
Weld Heat

Characterization of WELD Heat Affected Zone of ASTM A709 HPS 100W

2012 ◽  
Vol 706-709 ◽  
pp. 1474-1480
Author(s):  
Avidipto Biswas ◽  
Philip Nash ◽  
Sreeharsha Lalam ◽  
Steve Jansto
Keyword(s):  
Impact Toughness ◽  
Heat Affected Zone ◽  
Optical Microscope ◽  
Structure Property ◽  
Different Temperatures ◽  
Gleeble 3500 ◽  
Relationship Of ◽  
Weld Heat

The weld heat affected zone (HAZ) of HPS 100W was characterized in terms of microstructure and mechanical properties. HAZ simulation was carried out in a GLEEBLE 3500 along with in-situ dilation tests at different peak temperatures of 850°C, 1100°C, 1300°C and 1350°C with heat input of 2kJ/mm. Subsequently, impact toughness data were obtained at different temperatures by means of Charpy tests. The microstructures were characterized using optical microscope, SEM and TEM to correlate the structure-property relationship of the HAZ. Under the tested conditions, all the simulated HAZs exhibited higher impact toughness than the base metal.

scholarly journals Microstructure and Corrosion Resistance to H2S in the Welded Joints of X80 Pipeline Steel

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1325 ◽  
Author(s):  
Jian-Bao Wang ◽  
Guang-Chun Xiao ◽  
Wei Zhao ◽  
Bing-Rong Zhang ◽  
Wei-Feng Rao
Keyword(s):  
Corrosion Resistance ◽  
Heat Affected Zone ◽  
Welded Joints ◽  
Electrochemical Impedance ◽  
Pipeline Steel ◽  
Electrochemical Corrosion ◽  
Open Circuit ◽  
Coarse Grained ◽  
Granular Bainite ◽  
X80 Pipeline Steel

The microstructure and corrosion resistance in H2S environments for various zones of X80 pipeline steel submerged arc welded joints were studied. The main microstructures in the base metal (BM), welded metal (WM), coarse-grained heat-affected zone (CGHAZ), and fine-grained heat-affected zone (FGHAZ) were mainly polygonal ferrite and granular bainite; acicular ferrite with fine grains; granular bainite, ferrite, and martensite/austenite constituents, respectively. The corrosion behavior differences resulted from the microstructure gradients. The results of the micro-morphologies of the corrosion product films and the electrochemical corrosion characteristics in H2S environments, including open circuit potential and electrochemical impedance spectroscopy, showed that the order of corrosion resistance was FGHAZ > BM > WM > CGHAZ.

SEM In Situ Investigation on Fatigue Cracking Behavior of X80 Pipeline Steel with Inclusions

2011 ◽  
Vol 284-286 ◽  
pp. 1096-1100 ◽  
Author(s):  
Ke Tong ◽  
Yan Ping Zeng ◽  
Xin Li Han ◽  
Yao Rong Feng ◽  
Xiao Dong He
Keyword(s):  
Crack Initiation ◽  
Pipeline Steel ◽  
Fatigue Cracking ◽  
Fatigue Loading ◽  
In Situ Observation ◽  
X80 Pipeline Steel ◽  
Cracking Behavior ◽  
The Matrix ◽  
Extension Period

The micro-mechanical behavior of inclusions in X80 pipeline steel under fatigue loading was investigated by means of SEM in situ observation. The influence of sizes and shapes of inclusion on crack initiation and propagation was analyzed. The result shows that for large-size single-particle inclusion, cracks initiate from the interior under the fatigue loading. When a certain circulation cycles are reached, cracks initiate at the matrix near the sharp corner of the inclusion. The cracks extend at the matrix during the stable extension period and unstable extension period following the crack initiation, until fracture occurred. For chain inclusion, cracks first initiate at the interface between inclusion and matrix within the chain area, and the circulation cycles needed for initiation are far less than single inclusion. Cracks steadily extend after the initiation, and then fracture after very short circulation cycles. A chain of inclusion with the shape corners is serious harmful to the fatigue properties.

Characterization of the weld heat-affected zone in an alpha-two titanium aluminide

1992 ◽  
Vol 28 (1) ◽  
pp. 61-73 ◽  
Author(s):  
W.A. Baeslack ◽  
D. Phillips ◽  
G.K. Scarr
Keyword(s):  
Heat Affected Zone ◽  
Titanium Aluminide ◽  
Weld Heat
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