Redesign of exhaust systems for naval gas turbines: Usage of a new Cr-Mn austenitic stainless steel

H. J T Cruz, R. F. Martins, J. C G Veigas, J. L G Aveiro

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

Studies performed earlier show that the thermal shock loading has influence, together with the normal service loadings, in the fatigue life of some critical welded joints present in the exhaust systems of naval gas turbines [1-2]. In order to prevent the fatigue crack propagation that was verified in service [3], a recently developed ultrahigh-strength austenitic stainless steel was selected (Cr-Mn steel - number 1.4376) and its mechanical properties and the fatigue resistance are under study. This new material could replace, locally, the current material used in the main structure of the exhaust system (AISI 316L). Experimental data are shown. The temperature measured at the critical locations was about 350°C and the pressure applied in the system was calculated through a Computational Fluid Dynamics simulation (CFD), whose results are presented in the paper. The stresses induced by the loadings will be important to estimate the lifetime from the fatigue resistance tests (S-N curves) that will be performed, at 350°C, in butt and T-welded joints of AISI 316L stainless steel with Cr-Mn austenitic stainless steel.

Original languageEnglish
Title of host publicationAdvanced Materials Forum V
Pages497-503
Number of pages7
Volume636-637
DOIs
Publication statusPublished - 2010
Event5th International Materials Symposium MATERIAiS 2009 - 14th meeting of SPM - Sociedade Portuguesa de Materiais - Lisbon, Portugal
Duration: 5 Apr 20098 Apr 2009

Publication series

NameMaterials Science Forum
Volume636-637
ISSN (Print)02555476

Conference

Conference5th International Materials Symposium MATERIAiS 2009 - 14th meeting of SPM - Sociedade Portuguesa de Materiais
CountryPortugal
CityLisbon
Period5/04/098/04/09

Keywords

  • AISI 316L
  • Computational fluid dynamics
  • Cr-Mn austenitic stainless steel

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