Failure analysis of a gas turbine nozzle
Source abstract
Abstract
Abstract The failure analysis of the 70 MW gas turbine first stage nozzle made of cobalt-base alloy FSX-414 is presented. The nozzle experience cracks in different vane airfoil sections assisted by base alloy degradation due to an operation at high temperature. A detailed analysis of all elements which had an influence on the failure initiation was carried out, namely: decreasing of alloy ductility and toughness due to carbides precipitation in grain boundaries; grain growing (coarsening) and vane airfoil stress level. It was found that the vane crack initiation and propagation was drived by thermal fatigue mechanism. The vane crack initiation and propagation were due to fatigue mechanism which was facilitated by grain boundaries brittleness caused by formation of continuous film of carbides on grain boundaries, grains coarsening, and high thermal stress level.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: High Temperature Alloys and Creep · High-Temperature Coating Behaviors · Additive Manufacturing Materials and Processes
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (7)
Show source-provided references
1. STAR-CD Version 3.15A. Methodology. Computational Dynamics Limited; 2002.
2. Advanced cooled-engine shell/spar turbine vanes and blades. EPRI report AP-4751 project 1319-5; August 1986.
3. Brandt DE, Wesorick RR. GE gas turbine design philosophy. GER3434D, New York; 1994.
4. Assessment of service induced microstructural damage and its rejuvenation in turbine blades
5. Metallurgical considerations for life assessment and the safe refurbishment and requalification of gas turbine blade10.1115/1.1455638 ↗
6. Mazur et al. Desarrollo de Herramientas para Predicción de Vida Útil Residual de Álabes de Turbinas de Gas. Internal Report IIE/43/11887/002/P/07. Instituto de Investigaciones Electricas, Cuernavaca; 2003 [in Spanish].
7. Yoshioka Y, Saito D, Fujiyama K, Kashiwaya H. Life assessment techniques for gas turbine hot-section components. In: Proceedings of the sixth international conference on gas turbine lifetime assessment, Liege: 1998. p. 1411–20.