Validation of a Model of Linear Friction Welding of Ti6Al4V by Considering Welds of Different Sizes
- PDF / 1,826,718 Bytes
- 6 Pages / 593.972 x 792 pts Page_size
- 84 Downloads / 158 Views
RODUCTION
LINEAR friction welding (LFW) is a solid-state joining process which is of significant interest to the gas turbine sector for the manufacture of aeroengines.[1] It allows for instance the joining of turbine blades to disks, to produce the so-called blisks.[2] Therefore, in principle, it can replace mechanical fixturing by dovetail joints which have been used for a half-century or more. Smaller, lighter, and more compact designs or turbine rotors are then possible, with concomitant benefits in terms of performance, fuel economy, and CO2 emissions.[3–5] The LFW process was first reported in the literature more than 40 years ago, and since then much progress has been made in understanding microstructural evolution, residual stress states, and the effects of process parameters and process control. But, out of necessity due to the complexity of the process, much emphasis has been placed on empirical means for process optimization. The situation is changing somewhat now: driven by the widespread availability of computational resources at low cost and the development of numerical analysis techniques such as the finite element method, there is substantial interest in the modeling and simulation of the LFW process. Recently, some of the authors presented a paper which detailed one of the first numerical models for the LFW process.[6] F. SCHROEDER, Technical Project Manager, is with the Department of Metallurgy & Materials, University of Birmingham, Birmingham, West Midlands B15 2TT, U.K., and also with the HILTI Corporation, Schaan, Liechtenstein. R. MARK WARD and R.P. TURNER, Research Fellows, and M.M. ATTALLAH, Professor, are with the Department of Metallurgy & Materials, University of Birmingham. Contact e-mail: [email protected] A.R. WALPOLE, Research Engineer, is with the Rolls-Royce plc., Derby, Derbyshire DE24 8BJ, U.K. J.-C. GEBELIN, Research Engineer, is with the Department of Metallurgy & Materials, University of Birmingham, and also with the Doncasters, Doncaster, England. R.C. REED, Professor, is with the Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, U.K. Manuscript submitted January 24, 2014. Article published online July 14, 2015. 2326—VOLUME 46B, OCTOBER 2015
In the present paper, the authors report experimental work aimed at testing the accuracy of the latest version of a process model. It is capable of dealing with the conditioning and equilibrium phases and is first presented in Reference 7. In this paper, however, the focus is on the validation of the equilibrium phase part of the model. Targeted experimentation is carried out specifically to test the effect of weld cross-section size; accurate predictions are needed to support component design studies. Thermal data, upset rates, in-plane forces, and weld microstructure are presented here to validate the model.
II.
BACKGROUND: THE LINEAR FRICTION WELDING PROCESS
LFW is a process that produces high integrity joints suitable for safety-critical parts. It allows joining of parts with similar or dissimilar properti
Data Loading...
