Improving safety during operation of gas turbine units
| Autor: | N H Abdrakhmanov, Z A Zakirova, M N Guryanova, K N Abdrakhmanova, Yu N Savicheva |
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| Rok vydání: | 2022 |
| Zdroj: | IOP Conference Series: Earth and Environmental Science. 981:032047 |
| ISSN: | 1755-1315 1755-1307 |
| Popis: | This article considers the possibility of improving the safety during operation of gas turbine plants due to improving the strength characteristics of rotor blades, by using ultra-finegrained ferrite-martensitic steel of the EI-961 class for their manufacture. It is known that one of the main elements of stationary gas turbine plants is rotor blades made of EI-961 steel, which is a typical representative of ferrite-martensitic steels. Due to the fact that the blade complex determines the safety and service life of gas turbine plants, improving the strength characteristics of ferrite-martensitic stainless steels, it is important and relevant to increase the reliable and safe operation of such plants. As a result, studies have been carried out using EI-961 - stainless heat-resistant high-alloy martensitic-grade chromium-nickel steel as the starting material. To form an ultrafine structure, the samples were subjected to intense plastic deformation followed by heat treatment. It was revealed that the use of intense plastic deformation by torsion and equivocal angular pressing led to a significant increase in the microhardness of steel EI-961, which in turn leads to an increase in strength characteristics. To evaluate the mechanical properties, tensile tests of standard samples were carried out, which showed that additional re-hardening of samples after standard thermal treatment of martensitic steel EI-961 led to an increase in strength, it is clear that in an ultrafine state, the strength gain is greater than in coarse-grained (in an ultrafine state - 30%, coarse-grained - 11%), while maintaining ductility 5%. |
| Databáze: | OpenAIRE |
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