Prakt. Met. Sonderband 50 (2016) 15
tely 50 mm from as initially suggested by thick deposits found on the failed pin, did not seem to have played a
longitudinal axis significant role in the failure mechanism [1] — [5].
e tilted at almost
ly 0.3 mm where
would suggest an
e loose end and a
1 by the drawing,
ced by machining
distance between
t consistent with
2 original turning
perstructure. The Fig. 1: Failed dampening pin a large heavy-duty gas turbine engine
* subsequent shot
nage (FOD), that
t exactly perpen-
ture surface. The
al rupture. These
vclic tensile load
x a
oth pieces of the
is plainly visible
;ctable. Their ap- Fig. 2: Subject dampening pin in as-received condition
re surface is oxi-
lisation may both
ture surfaces are
» not match. This,
mer against each
bcated to the final
reased.
he cause of the
rly a combination
roughness of the
sensitive material
‘the failed part is
erature corrosion.
Fig. 3: Macrofractography, showing crack initiation site (black arrow), and beach marks (white arrows)