A Study of the Structural Characteristics of Titanium Alloy Products Manufactured Using Additive Technologies by Combining the Selective Laser Melting and Direct Metal Deposition Methods.

Marina Samodurova,Kirill Pashkeev,Nataliya Shaburova,Olga Samoilova,Evgeny Trofimov,Ramil’ Zakirov,Liudmila Radionova,Ivan Logachev,Vyacheslav Myasoedov

doi:10.3390/ma12193269

Abstract

Titanium alloy product manufacturing is traditionally considered to be a rather difficult task. Additive manufacturing technologies, which have recently become quite widespread, can ensure the manufacture of titanium alloys products of an arbitrary geometrical shape. During this study, we have developed a methodology for manufacturing titanium alloys products using additive technologies on FL-Clad-R-4 complex of laser melting of metals by combined Selective Laser Melting (SLM) and Direct Metal Deposition (DMD) methods. Ti–6Al–4V and Ti–6Al–4Mo–1V alloys were used for the manufacture of samples. We studied the microstructure of the obtained details and measured the microhardness of the samples. We discovered a gradient of the structure throughout the height of the details walls, which is connected with the peculiarities of thermal cycles of the technology used. This affected the microhardness values: in the upper part of the details, the microhardness is 10–25% higher (about 500 HV) than in the lower part (about 400 HV). Products made according to the developed technique do not have visible defects and pores. The obtained results indicate the competitiveness of the proposed methodology.

Highlights

Manufacturing products from titanium and its alloys using traditional methods is a complex process task
Further work was continued on the basis of South Ural State University (Chelyabinsk, Russia) in order to determine the possibility of combining Selective Laser Melting (SLM) and Direct Metal Deposition (DMD) methods for the manufacture of details from titanium alloys of complex geometric shapes
Details were fabricated by DMD method on FL-Clad-R-4 metal laser melting complex on previously manufactured SLM substrates

Summary

Introduction

Manufacturing products from titanium and its alloys using traditional methods is a complex process task. Details should be manufactured by the casting method in a controlled atmosphere (under vacuum or in a protective gas environment) to avoid the interaction of a titanium-based melt with oxygen and air nitrogen [1,2,3,4] Further machining of such details requires special conditions and equipment and is rather costly [5,6,7,8,9,10]. And Kampe in the work [26]

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Conclusion