Blade Lock Ring of 4th Stage Compressor Rotor: Failure Investigation
Present work describes the failure investigation of blade lock ring of 4th stage compressor rotor. The lock ring is fabricated from martensitic stainless steel. The microstructure of failed lock ring is tempered martensite. It shows non-metallic inclusions with three distinct shapes namely, elongat...
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Deer Hill Publications
2019-09-01
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doaj-2be1186c713640bb9df5ce15e38d4a662020-11-25T01:54:35ZengDeer Hill PublicationsInternational Journal of Engineering Materials and Manufacture0128-18522019-09-014310.26776/ijemm.04.03.2019.01Blade Lock Ring of 4th Stage Compressor Rotor: Failure InvestigationAshok Kumar Singh0Aginaparru Sambasiva Rao1DMRL, HyderabadDMRL HYDERABAD INDIA Present work describes the failure investigation of blade lock ring of 4th stage compressor rotor. The lock ring is fabricated from martensitic stainless steel. The microstructure of failed lock ring is tempered martensite. It shows non-metallic inclusions with three distinct shapes namely, elongated (MnS), globular (Al2O3) and complex shaped (oxy-sulphide). The corrosion pits and corrosion debris are observed in un-etched microstructure and fracture surface, respectively. The tree like branching cracks has observed at several places near surface. These cracks have initiated from the corrosion pits and then propagated inside the material. The interface of inclusions and matrix has also acted as crack initiator. The lock ring has initially suffered pitting corrosion in service and then cracks have propagated inside the material by stress corrosion cracking. http://www.deerhillpublishing.com/index.php/ijemm/article/view/99 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ashok Kumar Singh Aginaparru Sambasiva Rao |
spellingShingle |
Ashok Kumar Singh Aginaparru Sambasiva Rao Blade Lock Ring of 4th Stage Compressor Rotor: Failure Investigation International Journal of Engineering Materials and Manufacture |
author_facet |
Ashok Kumar Singh Aginaparru Sambasiva Rao |
author_sort |
Ashok Kumar Singh |
title |
Blade Lock Ring of 4th Stage Compressor Rotor: Failure Investigation |
title_short |
Blade Lock Ring of 4th Stage Compressor Rotor: Failure Investigation |
title_full |
Blade Lock Ring of 4th Stage Compressor Rotor: Failure Investigation |
title_fullStr |
Blade Lock Ring of 4th Stage Compressor Rotor: Failure Investigation |
title_full_unstemmed |
Blade Lock Ring of 4th Stage Compressor Rotor: Failure Investigation |
title_sort |
blade lock ring of 4th stage compressor rotor: failure investigation |
publisher |
Deer Hill Publications |
series |
International Journal of Engineering Materials and Manufacture |
issn |
0128-1852 |
publishDate |
2019-09-01 |
description |
Present work describes the failure investigation of blade lock ring of 4th stage compressor rotor. The lock ring is fabricated from martensitic stainless steel. The microstructure of failed lock ring is tempered martensite. It shows non-metallic inclusions with three distinct shapes namely, elongated (MnS), globular (Al2O3) and complex shaped (oxy-sulphide). The corrosion pits and corrosion debris are observed in un-etched microstructure and fracture surface, respectively. The tree like branching cracks has observed at several places near surface. These cracks have initiated from the corrosion pits and then propagated inside the material. The interface of inclusions and matrix has also acted as crack initiator. The lock ring has initially suffered pitting corrosion in service and then cracks have propagated inside the material by stress corrosion cracking.
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url |
http://www.deerhillpublishing.com/index.php/ijemm/article/view/99 |
work_keys_str_mv |
AT ashokkumarsingh bladelockringof4thstagecompressorrotorfailureinvestigation AT aginaparrusambasivarao bladelockringof4thstagecompressorrotorfailureinvestigation |
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1724986450607341568 |