Issue 30

A. Carofalo et alii, Frattura ed Integrità Strutturale, 30 (2014) 349-359; DOI: 10.3221/IGF-ESIS.30.42 358 (a) (b) Figure 9: Creep deformation against normalized time at 427.5 MPa (a) and 475 MPa (b) . C ONCLUSION ase and TIG welded Waspaloy has been mechanically tested and static, low-cycle fatigue and creep behaviour have been evaluated. The comparison of the experimental data between base and TIG welded material allowed calculating the reduction of the material performance for each mechanical property. The low level of the applied strain in a large number of fatigue tests constituted a limitation in order to utilize damage models for fatigue life prediction. A CKNOWLEDGMENTS his work has been financially supported by Apulia Region in the field of “Program Agreement about Research and Competitivity” approved with Regional Council Deliberation n° 2553 dated 22 December 2009. R EFERENCES [1] Taira, S., Fatigue at Elevated Temperatures, American Society for Testing and Materials, Philadelphia, (1973). [2] Tong, J., Vermeulen, B., The description of cyclic plasticity and viscoplasticity of waspaloy using unified constitutive equations, Int. Journal of Fatigue, 25 (2003) 413-420. [3] Kneifl, M., Černý, I., Bína, V., Damage of low-alloy high temperature steels loaded by low-cycle fatigue and creep, Int. J. Press. Vessel and Piping ,78 (2001) 921-927. [4] Yeom, J.T., Williams, S.J., Park, N.K., Low-cycle fatigue life prediction for Waspaloy, Materials at High Temperatures, 19(3) (2002) 153-161. [5] Garimella, L., Liaw, P., Klarstrom, D., A study of fatigue crack growth behavior of Haynes 242 alloy, JOM, 49 (1997) 67-71. [6] Cao, M., Gabrielli, F., Pelloux, R., Effect of temperature, loading frequency and heat treatment on fatigue crack growth in a nickel base alloy, Res Mechanica, 17 (1986) 163-177. [7] Bache, M.R., Evans, W.J., Hardy, M.C., The effects of environment and loading waveform on fatigue crack growth in Inconel 718, Int. Journal of Fatigue, 21 (1999) 69-77. [8] Goto, M., Yamomoto, T., Kawagoishi, N., Nisitani, H., Growth behaviour of small surface cracks in Inconel 718 superalloy, In: International Conference on Temperature-Fatigue Interaction, Ninth International Spring Meeting, 29 (2002) 237-246. [9] Tong, J., Dalby, S., Byrne, J., Henderson, M.B., Hardy, M.C., Creep, fatigue and oxidation in crack growth in advanced nickel-base superalloys, Int Journal of Fatigue, 23 (2001) 897-902. B T