论文信息 - The influence of high-temperature oxidation resistant titanium aluminide coating on low-cycle fatigue behaviour of titanium alloy IMI 834 at 600 °C

The influence of high-temperature oxidation resistant titanium aluminide coating on low-cycle fatigue behaviour of titanium alloy IMI 834 at 600 °C

The low-cycle fatigue behaviour of titanium alloy IMI 834 was comparatively studied in bare condition and with titanium aluminide (Al2Ti) coating at 600 °C in air. Results revealed that at higher values of total strain amplitudes (Δεt/2), Al2Ti-coated IMI 834 alloy has longer fatigue life (Nf) compared to the bare IMI 834 alloy, which appears to be due to load shifting to the coat. At lower values of Δεt/2, Al2Ti coating on IMI 834 alloy seems to have no effect on Nf. Higher values of cyclic strength coefficient (K′) and cyclic hardening exponent (n′) for coated IMI 834 alloy indicate that coating offers resistance to cyclic plastic deformation at 600 °C in air, and hence it is beneficial. The coating adheres well to the substrate and is also fairly resistant to high-temperature corrosion in sea water atmosphere at 600 °C.

K. Sahu | A. Ray | J. Sahu

[1] Vikas Kumar,et al. High‐temperature low cycle fatigue damage assessment in near alpha IMI‐834 titanium alloy , 2011 .

[2] Fu-hui Wang,et al. Hot Corrosion of Ti-Based Intermetallics with Coatings in NaCl+ (Na,K)2SO4 Melts at 750°C , 2009 .

[3] P. Ghosal,et al. The influence of dynamic strain aging on the low cycle fatigue behavior of near alpha titanium alloy IMI 834 , 2008 .

[4] D. Das,et al. Fatigue behavior of a thermal barrier coated superalloy at 800°C , 2007 .

[5] Amit Kumar,et al. Influence of stabilization treatment on low cycle fatigue behavior of Ti alloy IMI 834 , 2003 .

[6] Nidhi Singh,et al. Low cycle fatigue behavior of Ti alloy IMI 834 at room temperature , 2002 .

[7] H. Maier,et al. High-temperature fatigue damage mechanisms in near-α titanium alloy IMI 834 , 1999 .

[8] H. Maier,et al. Thermomechanical fatigue behavior of the high-temperature titanium alloy IMI 834 , 1998 .

[9] C. Leyens,et al. Intermetallic Ti-Al coatings for protection of titanium alloys: oxidation and mechanical behavior , 1997 .

[10] W. J. Brindley,et al. Stress relaxation of low pressure plasma-sprayed NiCrAlY alloys , 1993 .

[11] S. Kaloshkin,et al. Synthesis of titanium aluminide coatings on aluminum and titanium surfaces by mechanical alloying and subsequent annealing , 2006 .

[12] H. Nowack,et al. LIFE PREDICTION FOR THE TITANIUM ALLOY IMI 834 UNDER HIGH TEMPERATURE CREEP–FATIGUE LOADINGS , 1998 .