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The Influence of Centerline Segregation on Impact Toughness in Welding Heat-Affected Zone of X70 Pipeline Steel.

Authors :
Guo, Fujian
Zhang, Han
Liu, Wenle
Wang, Xuelin
Shang, Chengjia
Source :
Metals (2075-4701); Feb2024, Vol. 14 Issue 2, p209, 12p
Publication Year :
2024

Abstract

The influence of centerline segregation on the low-temperature impact toughness of the heat-affected zone (HAZ) of welded joints was studied by welding experiments on X70 steel plates rolled from continuous casting slabs with segregation grades of class 2 and class 3. The experimental results show that the impact toughness at HAZ from class 2 slab steel plate is more stable and has excellent low-temperature toughness than that of class 3 slab steel plate. The impact toughness of the HAZ of the class 3 slab steel plate is low to 100 J at −40 °C and has a severe fluctuation range (~150 J), and the delamination phenomenon is also observed in the fracture cross-section. The reason for this phenomenon is due to the enrichment of C and Mn elements in the centerline segregation zone. The formation of abnormal microstructure (martensite/bainite) in the segregation zone leads to stress concentration, which easily weakens the low-temperature toughness of the joint. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20754701
Volume :
14
Issue :
2
Database :
Complementary Index
Journal :
Metals (2075-4701)
Publication Type :
Academic Journal
Accession number :
175653017
Full Text :
https://doi.org/10.3390/met14020209