Microstructure changes responsible for the degradation of the 10CrMo9-10 and 13CrMo4-5 steels during long-term operation
The paper presents results of microstructure and mechanical testing examinations performed using optical and transmission electron microscopy, tensile tests and Charpy tests on 10CrMo9-10 and 13CrMo4-5 steels, before and after they were long-term operated at elevated temperatures in a steam heater....
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| Format: | Article |
| Language: | English |
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IOP Publishing
2019-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/ab5fc8 |
| _version_ | 1797747167652216832 |
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| author | Monika Gwoździk Mykhaylo Motylenko David Rafaja |
| author_facet | Monika Gwoździk Mykhaylo Motylenko David Rafaja |
| author_sort | Monika Gwoździk |
| collection | DOAJ |
| description | The paper presents results of microstructure and mechanical testing examinations performed using optical and transmission electron microscopy, tensile tests and Charpy tests on 10CrMo9-10 and 13CrMo4-5 steels, before and after they were long-term operated at elevated temperatures in a steam heater. In the 10CrMo9-10 steel, the optical microscopy detected a degradation of original bainite that was accompanied by the formation of ferrite, precipitates and micropores. The transmission electron microscopy revealed that the precipitates are M _23 C _6 and M _7 C _3 type carbides, which are located mainly at the boundaries of former austenite grains, and M _3 C type carbides, which appear inside the grains. The 13CrMo4-5 steel contained a relatively high amount of ferrite in the ferritic-bainitic/perlitic microstructure already in the originally state. The degradation of the microstructure was less serious than for the 10CrMo9-10 steel. The thermal treatment of the 13CrMo4-5 steel led mainly to the precipitation of carbides. The M _23 C _6 and M _7 C _3 type carbides form in perlitic-bainitic areas, while M _3 C and M _6 C type carbides precipitate in ferrite. The higher density of the grain boundary precipitates in the long-term operated 10CrMo9-10 steel facilitated the formation of creep-induced micropores and contributed to the hardness reduction. |
| first_indexed | 2024-03-12T15:47:14Z |
| format | Article |
| id | doaj.art-ab6ddb6306e148ff80bba02c50b9406c |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:47:14Z |
| publishDate | 2019-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-ab6ddb6306e148ff80bba02c50b9406c2023-08-09T15:22:27ZengIOP PublishingMaterials Research Express2053-15912019-01-017101651510.1088/2053-1591/ab5fc8Microstructure changes responsible for the degradation of the 10CrMo9-10 and 13CrMo4-5 steels during long-term operationMonika Gwoździk0https://orcid.org/0000-0002-4297-5821Mykhaylo Motylenko1David Rafaja2Department of Materials Engineering, Czestochowa University of Technology , Armii Krajowej 19, 42-201 Czestochowa, PolandInstitute of Materials Science, Freiberg University of Technology , Gustav-Zeuner-Str. 5, D-09599 Freiberg, GermanyInstitute of Materials Science, Freiberg University of Technology , Gustav-Zeuner-Str. 5, D-09599 Freiberg, GermanyThe paper presents results of microstructure and mechanical testing examinations performed using optical and transmission electron microscopy, tensile tests and Charpy tests on 10CrMo9-10 and 13CrMo4-5 steels, before and after they were long-term operated at elevated temperatures in a steam heater. In the 10CrMo9-10 steel, the optical microscopy detected a degradation of original bainite that was accompanied by the formation of ferrite, precipitates and micropores. The transmission electron microscopy revealed that the precipitates are M _23 C _6 and M _7 C _3 type carbides, which are located mainly at the boundaries of former austenite grains, and M _3 C type carbides, which appear inside the grains. The 13CrMo4-5 steel contained a relatively high amount of ferrite in the ferritic-bainitic/perlitic microstructure already in the originally state. The degradation of the microstructure was less serious than for the 10CrMo9-10 steel. The thermal treatment of the 13CrMo4-5 steel led mainly to the precipitation of carbides. The M _23 C _6 and M _7 C _3 type carbides form in perlitic-bainitic areas, while M _3 C and M _6 C type carbides precipitate in ferrite. The higher density of the grain boundary precipitates in the long-term operated 10CrMo9-10 steel facilitated the formation of creep-induced micropores and contributed to the hardness reduction.https://doi.org/10.1088/2053-1591/ab5fc810CrMo9-1013CrMo4-5carbidesTEM |
| spellingShingle | Monika Gwoździk Mykhaylo Motylenko David Rafaja Microstructure changes responsible for the degradation of the 10CrMo9-10 and 13CrMo4-5 steels during long-term operation Materials Research Express 10CrMo9-10 13CrMo4-5 carbides TEM |
| title | Microstructure changes responsible for the degradation of the 10CrMo9-10 and 13CrMo4-5 steels during long-term operation |
| title_full | Microstructure changes responsible for the degradation of the 10CrMo9-10 and 13CrMo4-5 steels during long-term operation |
| title_fullStr | Microstructure changes responsible for the degradation of the 10CrMo9-10 and 13CrMo4-5 steels during long-term operation |
| title_full_unstemmed | Microstructure changes responsible for the degradation of the 10CrMo9-10 and 13CrMo4-5 steels during long-term operation |
| title_short | Microstructure changes responsible for the degradation of the 10CrMo9-10 and 13CrMo4-5 steels during long-term operation |
| title_sort | microstructure changes responsible for the degradation of the 10crmo9 10 and 13crmo4 5 steels during long term operation |
| topic | 10CrMo9-10 13CrMo4-5 carbides TEM |
| url | https://doi.org/10.1088/2053-1591/ab5fc8 |
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