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Book Chapter

Wear and Failure of Babbit Bushes in Steam Turbine Sliding Bearings

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By N.P. Barykin, F.A. Sadykov, I.R. Aslanian
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001533
EISBN: 978-1-62708-225-9
... Steam turbines Wear tests Sn-13.5Sb-6.0Cu Sn-11.9Sb-4.5Cu Babbit (Other, miscellaneous, or unspecified) wear 1. Introduction The reliable operation of sliding bearings determines to a considerable extent the life and reliable operation of the steam turbine as a whole. 1 , 2 The cases...
Abstract
An investigation of wear and failure of babbitt bushes was completed in this study. The results showed that wear at dry sliding of babbitt obtained by plasma spraying was less than that of babbitt in the as-cast state and after a deformation heat treatment. The failure of babbitt bushes was caused by a simultaneous and interrelated exhibition of fatigue and wear processes that depend considerably on cohesion strength between the bush and the bearing base and accumulation of defects on the contact surface between the bush and the shaft.
Image

Babbit microstructure. (a) The presence of α (gray matrix), β (cubic crysta...

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in Wear and Failure of Babbit Bushes in Steam Turbine Sliding Bearings > ASM Failure Analysis Case Histories: Mechanical and Machine Components
Published: 01 June 2019
Fig. 1 Babbit microstructure. (a) The presence of α (gray matrix), β (cubic crystals), and η (arrow) phases (optical microscopy). (b) View of α phase (scanning electron microscopy). (c) Gas bubble (arrow) (optical microscopy). More
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Scanning electron micrographs of destroyed babbit surface fracture. (a) Fra...

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in Wear and Failure of Babbit Bushes in Steam Turbine Sliding Bearings > ASM Failure Analysis Case Histories: Mechanical and Machine Components
Published: 01 June 2019
Fig. 2 Scanning electron micrographs of destroyed babbit surface fracture. (a) Fragile failure of β and η phases (arrows). (b) Elastic failure of α phase (arrow). (c) Fracture area with a pore (arrow). (d) Fracture area with a crack (arrow) More
Image

View of babbit surface of friction. (a) A large reoriented area (arrow). (b...

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in Wear and Failure of Babbit Bushes in Steam Turbine Sliding Bearings > ASM Failure Analysis Case Histories: Mechanical and Machine Components
Published: 01 June 2019
Fig. 3 View of babbit surface of friction. (a) A large reoriented area (arrow). (b) Cracks (arrow) More
Image

Babbit microstructure after compression and forging. (a) and (b) Crack form...

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in Wear and Failure of Babbit Bushes in Steam Turbine Sliding Bearings > ASM Failure Analysis Case Histories: Mechanical and Machine Components
Published: 01 June 2019
Fig. 5 Babbit microstructure after compression and forging. (a) and (b) Crack formation and failure of β and η phases (arrows) after compression for a deformation degree of 35 and 60%, respectively. (c) After forging More
Image

Plasma-spray-coated babbit microstructure. (a) Optical micrograph. (b) Scan...

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in Wear and Failure of Babbit Bushes in Steam Turbine Sliding Bearings > ASM Failure Analysis Case Histories: Mechanical and Machine Components
Published: 01 June 2019
Fig. 6 Plasma-spray-coated babbit microstructure. (a) Optical micrograph. (b) Scanning electron micrograph of α phase More
Image

Dependence of babbit wear intensity on β-phase grain size at dry sliding

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in Wear and Failure of Babbit Bushes in Steam Turbine Sliding Bearings > ASM Failure Analysis Case Histories: Mechanical and Machine Components
Published: 01 June 2019
Fig. 7 Dependence of babbit wear intensity on β-phase grain size at dry sliding More
Book Chapter

Case Studies from 25 Years of Troubleshooting Vibration Problems

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By N.L. Baxter
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001578
EISBN: 978-1-62708-233-4
Abstract
Vibration analysis can be used in solving both rotating and nonrotating equipment problems. This paper presents case histories that, over a span of approximately 25 years, used vibration analysis to troubleshoot a wide range of problems.