Experimental Analysis of Residual Stresses on AlSi10Mg Parts Produced by Means of Selective Laser Melting (SLM)

Abstract During the Selective Laser Melting (SLM) process, the scanned layers are subjected to rapid thermal cycles. Steep temperature gradients generate residual stresses. Residual stresses can be detrimental to the proper functioning and the structural integrity of built parts. In this paper, the semi-destructive hole-drilling method has been used to measure the residual stresses on AISi10Mg parts after building, stress relieving and shot-peening, respectively. The outcomes have shown the presence, on the as-built components, of high tensile stresses that the usual post-processing operations are not able to minimize. The adopted method has proved to be a suitable tool to identify optimal process parameters for each step of the production cycle.

[1]  J. Kruth,et al.  Residual stresses in selective laser sintering and selective laser melting , 2006 .

[2]  J. Humbeeck,et al.  Residual stress via the contour method in compact tension specimens produced via selective laser melting , 2014 .

[3]  Y. Chen,et al.  RESIDUAL STRESS IN WELDMENT , 1992 .

[4]  J. Kruth,et al.  Assessing and comparing influencing factors of residual stresses in selective laser melting using a novel analysis method , 2012 .

[5]  M. L. Griffith,et al.  Residual stresses in components formed by the laserengineered net shaping (LENS®) process , 2003 .

[6]  J. Kruth,et al.  Selective Laser Melting of Crack-Free High Density M2 High Speed Steel Parts by Baseplate Preheating , 2014 .

[7]  Bekir Sami Yilbas,et al.  Laser bending of metal sheet and thermal stress analysis , 2014 .

[8]  G. Milovanović,et al.  Shape Preserving Approximations by Polynomials and Splines , 1997 .

[9]  L. Froyen,et al.  Lasers and materials in selective laser sintering , 2002 .

[10]  Miguel Cervera,et al.  Finite element modeling of multi-pass welding and shaped metal deposition processes , 2010 .

[11]  Tso-Liang Teng,et al.  Effect of welding sequences on residual stresses , 2003 .

[12]  Eleonora Atzeni,et al.  From Powders to Dense Metal Parts: Characterization of a Commercial AlSiMg Alloy Processed through Direct Metal Laser Sintering , 2013, Materials.

[13]  Michael B. Prime,et al.  Residual stresses in LENS® components using neutron diffraction and contour method , 2005 .

[14]  Paul A. Colegrove,et al.  Thermo-mechanical analysis of Wire and Arc Additive Layer Manufacturing process on large multi-layer parts , 2011 .

[15]  E. O. Olakanmi,et al.  A review on selective laser sintering/melting (SLS/SLM) of aluminium alloy powders: Processing, microstructure, and properties , 2015 .

[16]  Jerome Solberg,et al.  Implementation of a thermomechanical model for the simulation of selective laser melting , 2014 .

[17]  E. Toyserkani,et al.  On the delamination and crack formation in a thin wall fabricated using laser solid freeform fabrication process: An experimental-numerical investigation , 2009 .

[18]  Andrey V. Gusarov,et al.  Residual Stresses at Laser Surface Remelting and Additive Manufacturing , 2011 .