Effect of the Ti6Al4V Alloy Track Trajectories on Mechanical Properties in Direct Metal Deposition

Vitaly Bykov,Liudmila Radionova,Vyacheslav Lezin,Ivan Erdakov,Anastasia Bryk,Kirill Pashkeev,Lev Glebov

doi:10.3390/machines8040079

Abstract

The TiAl6V4 alloy is widely used in selective laser melting and direct laser melting. In turn, works devoted to the issue of how the track stacking scheme affects the value of mechanical properties is not enough. The influence of the Ti6Al4V alloy track trajectories on the microstructure and mechanical properties during direct laser deposition is studied in this article for the first time. The results were obtained on the influence of «parallel» and «perpendicular» technique of laying tracks in direct laser synthesis. All studied samples have a microstructure typical of the hardened two-phase condition titanium. Here, it is shown that the method of laying tracks and the direction of load application during compression testing relative to the location of the tracks leads to a change in the ultimate strength of the Ti-6Al-4V alloy from 1794 to 1910 MPa. The plasticity of the Ti-6Al-4V alloy obtained by direct laser alloying can vary from 21.3 to 33.0% depending on the direction of laying the tracks and the direction of the compression test. The hardness of alloys varies in the range from 409 to 511 HV and depends on the method of laying the tracks and the direction of hardness measurements.

Highlights

Titanium and its alloys are widely used in high-tech industries: Aircraft and rocketry, shipbuilding, nuclear power, chemical industry, and medicine.Titanium and titanium alloys are better than the majority of modern construction materials, such as steel and aluminum, in their physical and mechanical properties and manufacturability
The studies carried out have shown that it is necessary to take into account the layout of the tracks during direct laser melting of the powder material when designing finished parts of complex shapes or billet requiring finishing machining
It is shown that the «parallel» and «perpendicular» track arrangement is reflected in the mechanical properties of the material using the Ti-6Al-4V alloy as an example

Summary

Introduction

Titanium and its alloys are widely used in high-tech industries: Aircraft and rocketry, shipbuilding, nuclear power, chemical industry, and medicine.Titanium and titanium alloys are better than the majority of modern construction materials, such as steel and aluminum, in their physical and mechanical properties and manufacturability. Titanium and titanium-based alloys are characterized by high melting points and electrical resistivity, their strength is comparable to most grades of alloy steels, they have high corrosion resistance in air and water, and a chemically aggressive environment. They are non-magnetic and have many other useful properties. Adding other metals to titanium makes it possible to obtain alloys with a certain level of mechanical and operational properties. Their classification is divided into three groups:

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Results

Conclusion