Finite element analysis of the rapid manufacturing of Ti–6Al–4V parts by laser powder deposition

The overlapping of layers during part build-up in rapid manufacturing by laser powder deposition (LPD) causes consecutive thermal cycles in the previously deposited material that often lead to complex phase transformations and difficult to predict distributions of microstructure and properties. In this paper a model coupling finite element heat transfer calculations, phase transformation kinetics and microstructure–property relations in Ti–6Al–4V is presented and used to obtain processing maps relating the deposition parameters to the microstructure and properties of the parts.

[1]  Vilar Rui.  Laser cladding : Rapid prototyping/rapid manufacturing , 2001 .

[2]  J. Planell,et al.  Influence of tempering temperature and time on the α′-Ti-6Al-4V martensite , 1996 .

[3]  S. Kelly,et al.  Microstructural evolution in laser-deposited multilayer Ti-6Al-4V builds: Part I. Microstructural characterization , 2004 .

[4]  T. N. Baker,et al.  A semi-empirical model to predict the melt depth developed in overlapping laser tracks on a Ti–6Al–4V alloy , 1999 .

[5]  J. Hosson,et al.  Microstructure and properties of TiB/Ti-6Al-4V coatings produced with laser treatments , 2004 .

[6]  J. Mazumder,et al.  Direct materials deposition: designed macro and microstructure , 1998 .

[7]  Ian J. Polmear,et al.  Light Alloys: Metallurgy of the Light Metals , 1982 .

[8]  A. Wilson,et al.  Differential scanning calorimetry study and computer modeling of β ⇒ α phase transformation in a Ti-6Al-4V alloy , 2001 .

[9]  Wei Zhang,et al.  Phase transformation dynamics during welding of Ti–6Al–4V , 2004 .

[10]  J. Mei,et al.  Influence of position and laser power on thermal history and microstructure of direct laser fabricated Ti–6Al–4V samples , 2005 .

[11]  L. Xue,et al.  Free-form laser consolidation for producing metallurgically sound and functional components , 2000 .

[12]  G. Welsch,et al.  Elastic moduli and tensile and physical properties of heat-treated and quenched powder metallurgical Ti-6Al-4V alloy , 1991 .

[13]  Gernot Kostorz,et al.  Phase Transformations in Materials , 2001 .

[14]  Z. Fan.  On the young's moduli of Ti6Al4V alloys , 1993 .

[15]  Z. Guo,et al.  Resistivity study and computer modelling of the isothermal transformation kinetics of Ti–6Al–4V and Ti–6Al–2Sn–4Zr–2Mo–0.08Si alloys , 2001 .

[16]  W. Sha,et al.  Finite element modeling of the morphology of β to α phase transformation in Ti-6Al-4V alloy , 2002 .

[17]  V. Ocelík,et al.  Ti–6Al–4V strengthened by laser melt injection of WCp particles , 2002 .

[18]  A. M. Deus,et al.  Rapid tooling by laser powder deposition : Process simulation using finite element analysis , 2005 .

[19]  H. J. Rack,et al.  Phase transformations during cooling in α+β titanium alloys , 1998 .