Laser Additive Manufactured Ti-6Al-4V Alloy: Heat Treatment Studies

Journal article

Authors / Editors

Bhero, Shepherd

Research Areas

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Publication Details

Author list: Chandramohan P, Bhero S, Varachia F, Obadele BA, Olubambi PA

Publisher: Springer Verlag (Germany)

Place: NEW DELHI

Publication year: 2018

Journal: Transactions of the Indian Institute of Metals (0972-2815)

Journal acronym: T INDIAN I METALS

Volume number: 71

Issue number: 3

Start page: 579

End page: 587

Number of pages: 9

ISSN: 0972-2815

eISSN: 0975-1645

Languages: English-Great Britain (EN-GB)

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Abstract

The effect of heat treatment on microstructure and mechanical behaviours of direct metal laser sintered Ti-6Al-4V samples have been studied. Rectangular parts were built in two different directions; vertical and horizontal and subjected to two different heat treatment cycles: above beta transus and below beta transus with air cooling. Surface characteristics, microstructural examination and mechanical properties have been investigated. Below beta transus treatment creates a modification in the surface morphology with a fine dimple network. Above beta transus treatment leads to extensive grain growth at the middle section of the vertically build component thereby increasing its microhardness. Both the selected heat treatment cycles significantly reduces the tensile strength and improves the elongation when compared to as-sintered material. However, below transus temperature treated vertical built specimen results in optimum combination of tensile strength (1124 MPa) and elongation (20%). Higher coefficient of friction has been recorded for specimens after heat treatment.

Keywords

Build orientation, heat treatment, Laser, Wear

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