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)