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Residual stresses and microstructure in Powder Bed Direct Laser Deposition (PB DLD) samples

DOI: 10.1007/s12289-014-1163-1 DOI Help

Authors: X. Song (Singapore Institute of Manufacturing Technology) , M. Xie (University Of Oxford) , F. Hofmann (University of Oxford) , T. Illston (Materials Solutions) , T. Connolley (Diamond Light Source) , C. Reinhard (Diamond Light Source) , R. Atwood (Diamond Light Source) , L. Connor (Diamond Light Source) , M. Drakopoulos (Diamond Light Source) , L. Frampton (Rolls Royce Plc) , Alexander Korsunsky (University of Oxford)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: International Journal Of Material Forming

State: Published (Approved)
Published: January 2014
Diamond Proposal Number(s): 6974 , 7016

Abstract: In the present study, residual stresses in the Powder Bed Direct Laser Deposition (PB DLD) built parts were investigated using X-ray diffraction strain measurement and finite element simulation. The microstructure and texture of the DLD built parts were studied, indicating that the vertically elongated grains have preferred orientation of (001)-type pointing in the growth direction in the nickel superalloy C263. A conceptual model of residual stress generation was proposed using fictitious thermal expansion based on the argument that residual stresses arise from strain incompatibility that is “frozen in” within the work piece during fabrication.

Journal Keywords: Direct Laser Deposition (DLD); Residual Stresses (RS); Finite Element (FE) simulation; Synchrotron X-ray diffraction; Simplified conceptual thermal expansion model

Subject Areas: Materials


Instruments: I12-JEEP: Joint Engineering, Environmental and Processing