Residual strength of WC-Co cemented carbides after being subjected to abrupt temperature changes
Tipus de documentText en actes de congrés
Data publicació2014
Condicions d'accésAccés obert
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Abstract
Thermal shock and thermal fatigue
are recognized as common failure modes
for WC
-
Co cemented carbides
(hardmetals) in several applications
in
volving service temperature changes.
However, information on
microstructure
-
performance for these materials when subjected to abrupt changes in temper
ature is rather
limited.
In this investigation, the thermal shock resistance of two WC
-
Co cemented carbides
is studied on the
basis of their residual strength after being subjected to temperature changes. The materials studied
correspond to grades
with dif
ferent grain size (medium and ultrafine) but similar binder content.
Thermal
shock variables include two temperature difference ranges (400ºC and 550ºC) as well as number of abrupt
changes (1, 3 and 10). Residual strength results were related to
parameters
extracted from Hasselman’s
theory
.
It is found that
medium
-
sized
hardmetal
exhibits a higher strength loss in the first quenching cycle
but a greater damage tolerance to repeated thermal shocks than the ultrafine
-
sized.
The assessed residual
strength tren
ds are in agreement with those expected from
evaluation of
Hasselman’s parameters
for
quantifying resistance to either crack initiation or crack propagation induced by thermal shock
CitacióTarrago, J. [et al.]. Residual strength of WC-Co cemented carbides after being subjected to abrupt temperature changes. A: European Inter-Regional Conference on Ceramics. "Proceedings of the 14th European Inter-Regional Conference on Ceramics". Stuttgart: 2014, p. 47-52.
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