Deformation behavior and microstructure of Ti6Al4V manufactured by SLM

被引：123

作者：

Krakhmalev, P. ^{[1
]}

Fredriksson, G. ^{[1
]}

Yadroitsava, I. ^{[2
]}

Kazantseva, N. ^{[3
]}

du Plessis, A. ^{[4
]}

Yadroitsev, I. ^{[2
]}

机构：

[1] Karlstad Univ, Dept Engn & Phys, SE-65188 Karlstad, Sweden

[2] Cent Univ Technol, Dept Mech & Mechatron Engn, Private Bag X20539, ZA-9300 Bloemfontein, South Africa

[3] Urals Branch Acad Sci, Inst Met Phys, Ekaterinburg 620219, Russia

[4] Univ Stellenbosch, CT Scanner Facil, Private Bag 11, ZA-7602 Stellenbosch, South Africa

来源：

LASER ASSISTED NET SHAPE ENGINEERING 9 INTERNATIONAL CONFERENCE ON PHOTONIC TECHNOLOGIES PROCEEDINGS OF THE LANE 2016 | 2016年 / 83卷

关键词：

Ti6Al4V; tensile test; mechanical properties; porosity; microstructure; twinning; X-RAY TOMOGRAPHY; MECHANICAL-PROPERTIES; TITANIUM-ALLOYS; TI-6AL-4V; DUCTILITY; POROSITY; IMPROVEMENT;

D O I：

10.1016/j.phpro.2016.08.080

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Mechanical properties, porosity, and microstructure of Ti6Al4V (ELI) material produced by Selective Laser Melting (SLM) under controlled oxygen content were analyzed. Fully martensitic alpha structure with high dislocation density and stacking faults was observed in both as-built and stress relieved samples by means of XRD and TEM. Tensile {101 (2) over bar} twinning was identified by TEM and electron diffraction. Accommodation of thermal stresses during manufacturing was suggested as a possible reason for twinning. Computed tomography of pores was carried out. Pores in the specimens were evenly distributed and mostly had an elongated shape. Defect analysis by micro CT scans in pre-strained samples confirmed that the pore coalescence was the main crack formation mechanism in the final fracture with typical cup-and-cone fracture morphology. Additionally, typical dimples and quasi-cleavage were revealed. Mechanical properties of the samples after stress relieving heat treatment at 650 degrees C for 3 h are complied with the international standard for Ti alloys for biomedical applications. (C) 2016 The Authors. Published by Elsevier B.V.

引用

页码：778 / 788

页数：11

共 32 条

[1] Review of Mechanical Properties of Ti-6Al-4V Made by Laser-Based Additive Manufacturing Using Powder Feedstock [J].

Beese, Allison M. ;

Carroll, Beth E. .

JOM, 2016, 68 (03) :724-734

[2]

Benoit R.B., 2016, J MECH PHYS SOLIDS

[3] On the mechanistic basis of deformation at the microscale in hexagonal close-packed metals [J].

Britton, T. B. ;

Dunne, F. P. E. ;

Wilkinson, A. J. .

PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 2015, 471 (2178)

[4] In Situ Experiments with X ray Tomography: an Attractive Tool for Experimental Mechanics [J].

Buffiere, J. -Y. ;

Maire, E. ;

Adrien, J. ;

Masse, J. -P. ;

Boller, E. .

EXPERIMENTAL MECHANICS, 2010, 50 (03) :289-305

[5] Investigation of Porosity Changes in Cast Ti6Al4V Rods After Hot Isostatic Pressing [J].

du Plessis, Anton ;

Rossouw, Pierre .

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, 2015, 24 (08) :3137-3141

[6] Ductility of a Ti-6Al-4V alloy produced by selective laser melting of prealloyed powders [J].

Facchini, Luca ;

Magalini, Emanuele ;

Robotti, Pierfrancesco ;

Molinari, Alberto ;

Hoeges, Simon ;

Wissenbach, Konrad .

RAPID PROTOTYPING JOURNAL, 2010, 16 (06) :450-459

[7]

Frey M., 2009, Mechanical testing of DMLS parts, EOS whitepaper

[8] Improvement of fatigue resistance and ductility of TiAl6V4 processed by selective laser melting [J].

Kasperovich, Galina ;

Hausmann, Joachim .

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2015, 220 :202-214

[9] Evaluation of Titanium Alloys Fabricated Using Rapid Prototyping Technologies-Electron Beam Melting and Laser Beam Melting [J].

Koike, Mari ;

Greer, Preston ;

Owen, Kelly ;

Lilly, Guo ;

Murr, Lawrence E. ;

Gaytan, Sara M. ;

Martinez, Edwin ;

Okabe, Toru .

MATERIALS, 2011, 4 (10) :1776-1792

[10] In situ heat treatment in selective laser melted martensitic AISI 420 stainless steels [J].

Krakhmalev, P. ;

Yadroitsava, I. ;

Fredriksson, G. ;

Yadroitsev, I. .

MATERIALS & DESIGN, 2015, 87 :380-385

← 1 2 3 4 →