Life Estimation and Creep Damage Quantification of Service Exposed Reformer Tube
This paper deals with evaluation of creep damage of ~11 years service exposed primary hydrogen reformer tube made of HP-40 grade of steel in a petrochemical industry, which has been carried out in terms of Kachanav’s continuum damage mechanics (CDM) model (K-model) and Bogdanoff model (B-model) base...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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De Gruyter
2015-11-01
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| Series: | High Temperature Materials and Processes |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/htmp-2014-0111 |
| _version_ | 1819119493744427008 |
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| author | Raj A. Roy N. Roy B.N. Ray A.K. |
| author_facet | Raj A. Roy N. Roy B.N. Ray A.K. |
| author_sort | Raj A. |
| collection | DOAJ |
| description | This paper deals with evaluation of creep damage of ~11 years service exposed primary hydrogen reformer tube made of HP-40 grade of steel in a petrochemical industry, which has been carried out in terms of Kachanav’s continuum damage mechanics (CDM) model (K-model) and Bogdanoff model (B-model) based on Markov process. Residual life of the tubes was estimated based on hot tensile, conventional creep deformation under identical test conditions, optical microscopy and fractography. Accumulation of damage due to creep has been quantified through microstructural studies. The as received tubes did not reveal any degradation in the material like creep cavitation or voids, but there was indeed loss of tensile strength from room temperature to 870°C for the bottom portion of the tube due to ageing and overheating. Scatter in creep deformation behaviour of the material is probably due to variation in mode of fracture and scatter in voids. From statistical point of view, Weibull distribution pattern for analysing probability of rupture due to void area shifts with increase in true strain towards the higher population of void. The estimation of mean time to reach a specific damage state from K- model and B-model is in close agreement with that of experimental data and can describe the sudden changes of the creep damage in the tertiary region as well. A remnant life of >10 years is estimated at the operating stress–temperature conditions of the top as well as bottom portion of the tube. |
| first_indexed | 2024-12-22T06:05:39Z |
| format | Article |
| id | doaj.art-421061ffa60b4c5abfb37f49c160a899 |
| institution | Directory Open Access Journal |
| issn | 0334-6455 2191-0324 |
| language | English |
| last_indexed | 2024-12-22T06:05:39Z |
| publishDate | 2015-11-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | High Temperature Materials and Processes |
| spelling | doaj.art-421061ffa60b4c5abfb37f49c160a8992022-12-21T18:36:26ZengDe GruyterHigh Temperature Materials and Processes0334-64552191-03242015-11-0134773174210.1515/htmp-2014-0111Life Estimation and Creep Damage Quantification of Service Exposed Reformer TubeRaj A.0Roy N.1Roy B.N.2Ray A.K.3R.V.S. College of Engineering and Technology, Jamshedpur 831012, IndiaMaterials Science and Technology Division, CSIR-National Metallurgical Laboratory, Jamshedpur 831007, IndiaBIT (Birsa Institute of Technology), Sindri 828123, IndiaMaterials Science and Technology Division, CSIR-National Metallurgical Laboratory, Jamshedpur 831007, IndiaThis paper deals with evaluation of creep damage of ~11 years service exposed primary hydrogen reformer tube made of HP-40 grade of steel in a petrochemical industry, which has been carried out in terms of Kachanav’s continuum damage mechanics (CDM) model (K-model) and Bogdanoff model (B-model) based on Markov process. Residual life of the tubes was estimated based on hot tensile, conventional creep deformation under identical test conditions, optical microscopy and fractography. Accumulation of damage due to creep has been quantified through microstructural studies. The as received tubes did not reveal any degradation in the material like creep cavitation or voids, but there was indeed loss of tensile strength from room temperature to 870°C for the bottom portion of the tube due to ageing and overheating. Scatter in creep deformation behaviour of the material is probably due to variation in mode of fracture and scatter in voids. From statistical point of view, Weibull distribution pattern for analysing probability of rupture due to void area shifts with increase in true strain towards the higher population of void. The estimation of mean time to reach a specific damage state from K- model and B-model is in close agreement with that of experimental data and can describe the sudden changes of the creep damage in the tertiary region as well. A remnant life of >10 years is estimated at the operating stress–temperature conditions of the top as well as bottom portion of the tube.https://doi.org/10.1515/htmp-2014-0111conventional creep testfractographymicrostructural assessmentlarson–miller parameterexperimental scattercdm modelmarkov processremnant life81.70.-q |
| spellingShingle | Raj A. Roy N. Roy B.N. Ray A.K. Life Estimation and Creep Damage Quantification of Service Exposed Reformer Tube High Temperature Materials and Processes conventional creep test fractography microstructural assessment larson–miller parameter experimental scatter cdm model markov process remnant life 81.70.-q |
| title | Life Estimation and Creep Damage Quantification of Service Exposed Reformer Tube |
| title_full | Life Estimation and Creep Damage Quantification of Service Exposed Reformer Tube |
| title_fullStr | Life Estimation and Creep Damage Quantification of Service Exposed Reformer Tube |
| title_full_unstemmed | Life Estimation and Creep Damage Quantification of Service Exposed Reformer Tube |
| title_short | Life Estimation and Creep Damage Quantification of Service Exposed Reformer Tube |
| title_sort | life estimation and creep damage quantification of service exposed reformer tube |
| topic | conventional creep test fractography microstructural assessment larson–miller parameter experimental scatter cdm model markov process remnant life 81.70.-q |
| url | https://doi.org/10.1515/htmp-2014-0111 |
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