PSI - Issue 60

V. Venkatesh et al. / Procedia Structural Integrity 60 (2024) 372–381

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V Venkatesh et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 10. (a) Scanning electron image revealing the damage characteristics on the inner surface of the bearing housing, (b) Magnified view of the specific region indicated in (a), highlighting the extent of material loss due to fretting wear, and (c) EDX spectrum recorded on a region of the damaged surface shown in (a); note the spectrum confirms the presence of bearing race material constituents (Fe-Cr-Ni steel) on the inner surface of the Ti-Al-V alloy housing. 3.6. Metallurgical examination A sample was sectioned from the control rod, metallographically prepared on longitudinal section and subjected to metallurgical evaluation. Chemical composition of the control rod was determined using energy dispersive X-ray (EDX) analyzer attached to the SEM. The results obtained are given in Table 1. The microstructure of the control rod consisted of primary α and transformed β (refer Fig.11). Examination did not reveal any deleterious phases or metallurgical abnormalities in the microstructure. Hardness measurements were carried out on the metallographically prepared longitudinal section of the control rod on a Vickers micro-hardness tester at a load of 1.0 kg. The control rod possessed hardness in the range 319 to 330 HV 1.0 . The control rod conformed to the design specifications with respect to chemical composition, microstructure, and hardness.