Experimental optimization of laser additive manufacturing process of single-crystal nickel-base superalloys by a statistical experiment design method

Abstract Experimental process optimization is essential to obtain reliable processing conditions prior to performing actual laser additive manufacturing (LAM) of single-crystal (SX) nickel-base superalloys. The influence of processing parameters on deposited productivity and epitaxial SX growth in powder-feeding LAM process was systematically investigated by the orthogonal experiment (OE) method, a statistical experiment design method. This method can rapidly and economically estimate the effect of each processing parameter by a small number of experiments. Resulting relationship between the processing variables and each of deposited productivity and microstructure formation contributes to the selection of detailed processing conditions to balance the factors crucial to successful SX LAM, which means that appropriate adjustment of the processing parameters during actual SX LAM is easy to be performed. On the basis of the analyses of the OE results, a combination of relatively high power, low scanning velocity and moderate powder feeding rate is beneficial to both deposited productivity and epitaxial SX growth during powder-feeding LAM, and allows the preparation of good multilayer SX deposits with fine dendrites.

[1]  R. Poprawe,et al.  Laser additive manufacturing of metallic components: materials, processes and mechanisms , 2012 .

[2]  J. Vitek.  The effect of welding conditions on stray grain formation in single crystal welds – theoretical analysis , 2005 .

[3]  Suman Das,et al.  A Microstructure Evolution Model for the Processing of Single-Crystal Alloy CMSX-4 Through Scanning Laser Epitaxy for Turbine Engine Hot-Section Component Repair (Part II) , 2014, Metallurgical and Materials Transactions B.

[4]  Hua-ming Wang,et al.  Origin of stray-grain formation and epitaxy loss at substrate during laser surface remelting of single-crystal nickel-base superalloys , 2016 .

[5]  Huan Qi,et al.  Effects of substrate crystallographic orientations on crystal growth and microstructure formation in laser powder deposition of nickel-based superalloy , 2015 .

[6]  Xu Cheng,et al.  A new microsegregation model for rapid solidification multicomponent alloys and its application to single-crystal nickel-base superalloys of laser rapid directional solidification , 2016 .

[7]  J. Dupont,et al.  Effects of melt-pool geometry on crystal growth and microstructure development in laser surface-melted superalloy single crystals: Mathematical modeling of single-crystal growth in a melt pool (part I) , 2004 .

[8]  H. Kim,et al.  Experimental optimization of the formation of silver dendritic particles by electrochemical technique , 2005 .

[9]  Lilin Wang,et al.  Effect of substrate orientation on the columnar-to-equiaxed transition in laser surface remelted single crystal superalloys , 2015 .

[10]  S. Tor,et al.  Sintering study of 316L stainless steel metal injection molding parts using Taguchi method: final density , 2001 .

[11]  H. Qi,et al.  Numerical Simulation of Transport Phenomena for a Double-Layer Laser Powder Deposition of Single-Crystal Superalloy , 2014, Metallurgical and Materials Transactions A.

[12]  Suman Das,et al.  Erratum to: A Coupled Thermal, Fluid Flow, and Solidification Model for the Processing of Single-Crystal Alloy CMSX-4 Through Scanning Laser Epitaxy for Turbine Engine Hot-Section Component Repair (Part I) , 2014, Metallurgical and Materials Transactions B.

[13]  Wilfried Kurz,et al.  LASER METAL FORMING: PROCESS FUNDAMENTALS , 1996 .

[14]  T. R. Bement,et al.  Taguchi techniques for quality engineering , 1995 .

[15]  M. L. Griffith,et al.  Free form fabrication of metallic components using laser engineered net shaping (LENS{trademark}) , 1996 .

[16]  Xu Cheng,et al.  Prediction of primary dendritic arm spacing during laser rapid directional solidification of single-crystal nickel-base superalloys , 2016 .

[17]  D. Barbier,et al.  Optimisation of RF magnetron sputtering and RTA-crystallisation of Pb(Zr0.52Ti0.48)O3 thin films by means of the orthogonal array method , 1998 .

[18]  John N. DuPont,et al.  Origin of stray grain formation in single-crystal superalloy weld pools from heat transfer and fluid flow modeling , 2010 .

[19]  R. Roy.  A Primer on the Taguchi Method , 1990 .

[20]  Genichi Taguchi,et al.  Introduction to quality engineering.... , 2014 .

[21]  W. Kurz,et al.  SINGLE-CRYSTAL LASER DEPOSITION OF SUPERALLOYS: PROCESSING-MICROSTRUCTURE MAPS , 2001 .

[22]  J. Dupont,et al.  Effects of substrate crystallographic orientations on crystal growth and microstructure development in laser surface-melted superalloy single crystals. Mathematical modeling of single-crystal growth in a melt pool (Part II) , 2005 .

[23]  J. Chou,et al.  Design of a fuzzy logic approach based on genetic algorithms for robust plasma-sprayed zirconia depositions , 2007 .

[24]  T. Pollock,et al.  Stabilization of thermosolutal convective instabilities in Ni-based single-crystal superalloys: Carbide precipitation and rayleigh numbers , 2003 .

[25]  R. Reed.  The Superalloys: Fundamentals and Applications , 2006 .

[26]  M. Donachie,et al.  Superalloys: A Technical Guide , 2002 .

[27]  Yaojian Liang,et al.  Solidification path of single-crystal nickel-base superalloys with minor carbon additions under laser rapid directional solidification conditions , 2017 .

[28]  Yanyan Zhu,et al.  Grain morphology evolution behavior of titanium alloy components during laser melting deposition additive manufacturing , 2015 .

[29]  G. Leisk,et al.  Heat treatment optimization of alumina/aluminum metal matrix composites using the taguchi approach , 1992 .

[30]  J. Hunt,et al.  Steady state columnar and equiaxed growth of dendrites and eutectic , 1984 .