Page 432 - Failure Analysis Case Studies II

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(b)
Fig. 1. (a) The plane after the accident. (b) Bearing components on the compressor shaft after the accident.

Table 1. Chemical composition of the different parts of the CMB
Composition wt.% of components
Element Cage Balls Inner race Outer race Bearing lock
Cr - 1.67 k0.12 1.76 & 0.1 1 1.63 k 0.02 1.06 k 0.16
Mn 1.33+0.12 0.40 k 0.10 0.37k0.07 0.25 f 0.05 0.60k0.07
Si - 0.25 k 0.04 0.30 k 0.09 0.35 k 0.15 0.28 f 0.06
C 0.92+0.01 1.02~0.01 0.98f0.01 0.37k0.01
S - 0.001 0.003 0.001 0.002
AI 7.82 k 0.12 - - - 0.44 k 0.06
cu Bal. - - - -
Fe 1.62 k 0.07 Bal. Bal. Bal. Bal.
Material QA110-3-1.5t AISI 52100 AISI 52100 AISI 52100 38 Cr Alt
t Closest standard.

2.1. After the accident

Examination of the compressor region revealed that the cage was broken and significantly
deformed. The inner and outer races were put together with the cage and the probable configuration