Microstructural unit controlling cleavage crack propagation in high strength bainitic steels
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Cita com:
hdl:2117/25201
Tipus de documentArticle
Data publicació2014-09
Condicions d'accésAccés obert
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Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
The strengthening mechanisms which are operative in bainite are very
well
known: small
bainite packet, small width of the laths, dislocation density and size and number of carbide particles
(Fe
3
C), among others. Bainite packet size has been traditionally c
onsidered as the value measured
by optical microscopy (OM), as electron back scattered diffraction (EBSD) technique is relatively
recent. In a V
-
microalloyed steel with bainitic microstructure of C=0.38%
,
V=0.12% and N=
0.0214% the average length and width
of ferrite laths and of cementite carbides were measured. On
the other hand, the bainite packet size was measured by OM and EBSD with a
misorientation
of
15º
.
These values of the microstructural units have been taken in account to calculate the effective
surface energy
p
given by Griffith’s model for cleavage fracture. It was concluded that bainite
packet size determined by EBSD with a misorientation angle crit
erion
of 15º was the
microstructural parameter that controls cleavage crack propagation. Given
the relationship between
the average unit crack path (UCP) and the bainite packet size, it was concluded that the
effective
surface energy of cleavage fracture (
p
)
would be between 71.6 and 82.6 J m
-
2
CitacióMedina, S. [et al.]. Microstructural unit controlling cleavage crack propagation in high strength bainitic steels. "Key engineering materials", Setembre 2014, vol. 622-623, p. 846-853.
ISSN1013-9826
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