Product Code: ICAL05_1402

The Effect of Process Parameters on Residual Stresses Within an Inconel 718 Part Produced by the Direct Laser Deposition Process
Authors:
Andrew Pinkerton, University of Manchester; Manchester UK
Judith Shackleton, University of Manchester; Manchester Great Britain
Richard Moat, University of Manchester; Manchester Great Britain
Lin Li, University of Manchester; Manchester Greater Manches Great Britain
Philip Withers, University of Manchester; Manchester Greater Manches Great Britain
Michael Preuss, The University of Manchester; Manchester Great Britain
Jeffrey Allen, Rolls-Royce plc; Derby Derbyshire Great Britain
Paul Hilton, TWI Ltd; Cambridge Cambridgeshire Great Britain
Robert Folwell, Winbro Group Technologies Ltd; Coalville Leicestershire Great Britain
Presented at ICALEO 2005

The residual stress fields generated within a laser deposition metal component or added feature have the potential to significantly affect its properties and performance. Stresses play a major role in determining the initial levels of distortion, in both the added part and the initial substrate material, and affect both final short-time properties, such as ductility, and long-time properties, such as creep and corrosion resistance. Their control is therefore essential for the production quality demanded in high performance aerospace components. In this work, a series of geometrically simple components was additively manufactured from Inconel 718 powder using a coaxial diode laser deposition system. The residual stresses arising from the laser deposition were measured using x-ray diffraction techniques. The variations in stress magnitude and direction with position within the component across a range of process parameters are shown. The formation of these stresses and their dependence on the thermal cycle during manufacture are discussed.