Micromechanisms of cleavage fracture initiation from inclusions in ferritic welds
Micromechanisms of cleavage fracture have been investigated in high strength weld metals with two types of microstructure. The local fracture stress was measured using notched bend testpieces, and by combining FEM predictions of local variations of local tensile stress and fractographic observations...
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Published in | Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 460; pp. 436 - 452 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
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Elsevier B.V
01.07.2007
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Abstract | Micromechanisms of cleavage fracture have been investigated in high strength weld metals with two types of microstructure. The local fracture stress was measured using notched bend testpieces, and by combining FEM predictions of local variations of local tensile stress and fractographic observations of initiation sites. The value of
σ
F(
X
0) is significantly higher for weld metals with a lath-like microstructure. Inclusions have been found to be present in 82% of the initiation sites and undoubtedly they were usually responsible for the initiation of catastrophic cleavage fracture in both type of microstructures studied here. Local plasticity appears to be required to initiate cleavage fracture. An analysis of the potential difference between the local yield stress and the mean yield stress (from tensile testing) and the accuracy of predicted size of the plastic zone, suggests that these initiation sites are actually likely to be located inside the plastic zone. For a classical microstructure the value of the effective surface energy,
γ
p, was deduced to be approximately 9
J
m
−2; and for lath-like microstructures it was found to be approximately 13
J
m
−2. |
---|---|
AbstractList | Micromechanisms of cleavage fracture have been investigated in high strength weld metals with two types of microstructure. The local fracture stress was measured using notched bend testpieces, and by combining FEM predictions of local variations of local tensile stress and fractographic observations of initiation sites. The value of
σ
F(
X
0) is significantly higher for weld metals with a lath-like microstructure. Inclusions have been found to be present in 82% of the initiation sites and undoubtedly they were usually responsible for the initiation of catastrophic cleavage fracture in both type of microstructures studied here. Local plasticity appears to be required to initiate cleavage fracture. An analysis of the potential difference between the local yield stress and the mean yield stress (from tensile testing) and the accuracy of predicted size of the plastic zone, suggests that these initiation sites are actually likely to be located inside the plastic zone. For a classical microstructure the value of the effective surface energy,
γ
p, was deduced to be approximately 9
J
m
−2; and for lath-like microstructures it was found to be approximately 13
J
m
−2. Micromechanisms of cleavage fracture have been investigated in high strength weld metals with two types of microstructure. The local fracture stress was measured using notched bend testpieces, and by combining FEM predictions of local variations of local tensile stress and fractographic observations of initiation sites. The value of sigmaF(X0) is significantly higher for weld metals with a lath-like microstructure. Inclusions have been found to be present in 82% of the initiation sites and undoubtedly they were usually responsible for the initiation of catastrophic cleavage fracture in both type of microstructures studied here. Local plasticity appears to be required to initiate cleavage fracture. An analysis of the potential difference between the local yield stress and the mean yield stress (from tensile testing) and the accuracy of predicted size of the plastic zone, suggests that these initiation sites are actually likely to be located inside the plastic zone. For a classical microstructure the value of the effective surface energy, gammap, was deduced to be approximately 9Jm-2; and for lath-like microstructures it was found to be approximately 13Jm-2. |
Author | Bowen, P. Bose Filho, W.W. Carvalho, A.L.M. |
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Cites_doi | 10.1007/BF02782411 10.1016/0001-6160(84)90234-7 10.1007/BF02668526 10.1016/0013-7944(90)90111-S 10.1179/030634583790427603 10.1179/msc.1978.12.11.511 10.1016/0022-5096(71)90009-3 10.1007/BF00722228 10.1179/mst.1987.3.12.1051 10.1179/mst.1994.10.5.353 10.1016/0001-6160(86)90026-X 10.1007/BF02650098 10.1016/0022-5096(86)90020-7 10.1016/0001-6160(87)90119-2 10.1179/030634583790420420 10.1016/0001-6160(87)90087-3 |
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Keywords | HSLA Lath-like microstructure Micromechanisms of cleave fracture Inclusion Welds Classical microstructure |
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Snippet | Micromechanisms of cleavage fracture have been investigated in high strength weld metals with two types of microstructure. The local fracture stress was... |
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SubjectTerms | Classical microstructure HSLA Inclusion Lath-like microstructure Micromechanisms of cleave fracture Welds |
Title | Micromechanisms of cleavage fracture initiation from inclusions in ferritic welds |
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