Single Very Turbine Blades

Single very blade materials have discovered extensive use within hot temperature service applications for example rotating aerofoils and static vanes within the gas turbine as a result of favourable mixture of mechanical qualities including impressive hot temperature fatigue, creep and ecological conduct. Since internal grain limitations are absent in single crystals, CMSX-4, the fabric preferred by many HP turbine applications, exhibits highly anisotropic mechanical qualities, in the elastic and plastic loading regimes. As a result, recent research centered on the off-axis effects and multi-axial fatigue conduct from the second generation Ni-based single very superalloy CMSX-4 included in the TSB funded SAMULET programme (Proper Affordable Manufacturing of United kingdom Leading Ecological Technologies), with future studies scheduled underneath the SILOET II (Proper Purchase of Low-carbon Engine Technology) project.

Previous research carried out at Swansea has detailed the result of plain and notched fatigue on Ni-based single very alloys orientated in 001 direction. The work focussed on CMSX-4 and 2 experimental alloys, exploring their LCF characteristics although assessing the outcome of internal casting porosity on fatigue existence at numerous temperatures.

• W.J. Evans, R.J. Lancaster, A. Steele, M.T. Whittaker and N. Johnson. “Plain and Notched Fatigue in Nickel Single Very Alloys ”. Worldwide Journal of Fatigue 31, Issues 11-12 (2009) 1709-1718.
• W.J. Evans, R.J. Lancaster, A. Steele and N. Johnson. “The Characterisation and Conjecture of LCF Conduct in Nickel Single Very Blade Alloys”. Proceedings from the Eleventh Worldwide Symposium on Superalloys September 14-18, 2008, Pennsylvania. pp 425-432.

• Barnard N.C. MacLachlan D.W. Johnson N. Mason-Flucke J. Bagnall S.M. Bache M.R. “Low cycle fatigue of CMSX-4 in off-axis orientations and the consequence of multi-axial stress condition”, in Superalloys 2012: Proceedings from the twelfth Worldwide Symposium on Superalloys, Eds. E.S. Huron, R.C. Reed, M.C. Sturdy, M.J. Mills, R.E. Montero, P.D. Portella J. Telesman, (TMS, 2012), September 9-13, 2012, Seven Springs, PA, USA, pp. 293-300.
• R.J. Lancaster. “The Notch Sensitivity and Crack Propagation of 4th Generation Single Very Superalloys”. PhD Thesis, Swansea College 2008.