TY - JOUR
T1 - Splitting susceptibility in modern X80 pipeline steels
AU - Gervasyev, Alexey
AU - Pyshmintsev, Igor
AU - Petrov, Roumen
AU - Huo, Chunyong
AU - Barbaro, Frank
PY - 2020
Y1 - 2020
N2 - The microstructure and crystallographic texture of modern industrially produced API X80 grade pipeline steels were studied to identify the factors associated with the phenomenon known as splitting, which can occur on the fracture surfaces of Charpy, drop-weight tear test and full-scale fracture propagation tests. The steels investigated originated from full-scale production of line pipes, which had shown different levels of crack arrestability under full-scale burst test conditions. It was shown that a low Charpy impact transition temperature in the through thickness direction corresponded with a low susceptibility to splitting under conventional test methods and an increased resistance to ductile fracture propagation. The microstructural features shown to be consistent with an increased susceptibility to splitting included banding of the {001}<110> texture component in the microstructure and the presence of hard microstructure constituents being potential initiation sites for cleavage fracture. It is suggested that these results provide a viable test method to classify steel susceptibility to splitting and potential performance in full-scale ductile fracture tests.
AB - The microstructure and crystallographic texture of modern industrially produced API X80 grade pipeline steels were studied to identify the factors associated with the phenomenon known as splitting, which can occur on the fracture surfaces of Charpy, drop-weight tear test and full-scale fracture propagation tests. The steels investigated originated from full-scale production of line pipes, which had shown different levels of crack arrestability under full-scale burst test conditions. It was shown that a low Charpy impact transition temperature in the through thickness direction corresponded with a low susceptibility to splitting under conventional test methods and an increased resistance to ductile fracture propagation. The microstructural features shown to be consistent with an increased susceptibility to splitting included banding of the {001}<110> texture component in the microstructure and the presence of hard microstructure constituents being potential initiation sites for cleavage fracture. It is suggested that these results provide a viable test method to classify steel susceptibility to splitting and potential performance in full-scale ductile fracture tests.
KW - Ductile fracture propagation
KW - Microstructure
KW - Splitting
KW - Texture
KW - Through-thickness toughness
KW - X80 pipeline steel
UR - http://www.scopus.com/inward/record.url?scp=85075780908&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2019.138746
DO - 10.1016/j.msea.2019.138746
M3 - Article
AN - SCOPUS:85075780908
VL - 772
JO - Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing
JF - Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing
SN - 0921-5093
M1 - 138746
ER -