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Effect of microstructure on internal and external hydrogen embrittlement of an ultrahigh strength...
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Effect of microstructure on internal and external hydrogen embrittlement of an ultrahigh strength steel
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http://www.ohsu.edu/xd/education/library/services/theses-dissertations/rights-statement.cfm
Title
Effect
of
microstructure
on
internal
and
external
hydrogen
embrittlement
of an
ultrahigh
strength
steel
Creator.PersonalName
Dedhia
,
Dilipkumar
D
.
Thesis.Degree
Ph.D.
Thesis.Major
Materials Science
Thesis.DateDegreeAwarded
February
1980
Institution
Oregon Graduate Center
Department
Dept. of Materials Science
Thesis.Advisor/Mentor
Wood, William E.
Thesis.Committee
Holmes, J. Fred
Eror, Nicholas G.
Devletian, Jack H.
Subject.LCSH
Steel -- Hydrogen embrittlement
Acoustic emission
Call Number
Q183.5.OGC D43 1980
Description.Abstract
Hydrogen
assisted
cracking
in
low
alloy
ultrahigh
strength
AISI
4340
steel
heat
treated
to
above
200
ksi
yield
strength
was
slightly
dependent
on
microstructural
features
such
as
grain
size
,
carbide
type
,
amount
of
retained
austenite
and
grain
boundary
composition
. The
susceptibility
of the
steel
to
hydrogen
was
similar
for
both
internal
as
well
as
external
hydrogen
induced
embrittlement
.
Increasing
the
prior
austenite
grain
size
slightly
improved
the
threshold
stress
intensity
but
did
not have any
effect
on
region
II
crack
growth
rates
. The
change
from
epsilon
carbide
to
cementite
increased
the
region
II
crack
growth
rates
. The
presence
of
retained
austenite
slightly
improved
the
threshold
stress
intensity
for
hydrogen
assisted
cracking
.
However
, its
thermal
and
mechanical
instability
actually
increased
the
region
II
crack
growth
rates
.
Acoustic
emission
analysis
confirmed
the
discontinuous
nature
of
hydrogen
assisted
cracking
. These
discontinuous
steps
were
found
to be
dependent
upon
the
prior
austenitic
grain
size
. From
acoustic
emission
results
and
based
on the
fact
that the
region
II
crack
growth
rates
were
independent
of
grain
size
,
it
was
possible
to
propose
a
mechanistic
model
for
hydrogen
assisted
cracking
which
combined
the
models
proposed
by
Troiano
and
Petch
and
Stables
.
Language
eng
Type
Text
Format.Use
Needs Adobe Acrobat Reader to view.
Format.FileType
pdf
Format.FileSize
3001.064 KB
OCLC number
10648421
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