TY - GEN
T1 - Redesign of exhaust systems for naval gas turbines
T2 - 5th International Materials Symposium MATERIAiS 2009 - 14th meeting of SPM - Sociedade Portuguesa de Materiais
AU - Cruz, H. J T
AU - Martins, R. F.
AU - Veigas, J. C G
AU - Aveiro, J. L G
PY - 2010
Y1 - 2010
N2 - 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.
AB - 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.
KW - AISI 316L
KW - Computational fluid dynamics
KW - Cr-Mn austenitic stainless steel
UR - http://www.scopus.com/inward/record.url?scp=75649086583&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.636-637.497
DO - 10.4028/www.scientific.net/MSF.636-637.497
M3 - Conference contribution
AN - SCOPUS:75649086583
SN - 0878492887
SN - 9780878492886
VL - 636-637
T3 - Materials Science Forum
SP - 497
EP - 503
BT - Advanced Materials Forum V
Y2 - 5 April 2009 through 8 April 2009
ER -