Microstructure and Mechanical Properties of CrMoV Steel after Long-Term Service
| Autor: | Jacek Słania, J. Jasak, S. Mroziński, I. Pietryka, Grzegorz Golański |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Service (business) lcsh:TN1-997 Materials science Materials processing Metallurgy Metals and Alloys Industrial chemistry 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Term (time) 0103 physical sciences lcsh:TA401-492 lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology lcsh:Mining engineering. Metallurgy |
| Zdroj: | Archives of Metallurgy and Materials, Vol 61, Iss 1, Pp 51-54 (2016) |
| ISSN: | 2300-1909 |
| Popis: | The paper presents the results of research on the microstructure and mechanical properties of 12HMF steel after longterm service. The investigated material was taken from a pipeline with circumferential welded joint after 419 988 hours of service at the temperature of 490°C, steam pressure 8 MPa. Performed research has shown that the 12HMF steel after service was characterized by a typical microstructure for this grade of steel, that is a ferritic-bainitic microstructure without any visible advanced processes of its degradation. The investigation of mechanical properties has shown that the examined steel after service was characterized by a very low impact energy KV, and yield strength lower than the required minimum. Whilst tensile strength and yield strength determined at elevated temperature was higher and similar to the standard requirements, respectively. It has been proved that the main cause of an increase in brittleness and a decrease in yield strength of the examined steel should be seen in the segregation of phosphorus to grain boundaries and the formation of precipitate free zones near the boundaries. |
| Databáze: | OpenAIRE |
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