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

P. Chandramohan, Shepherd Bhero, Farouk Varachia, Babatunde Abiodun Obadele, Peter Apata Olubambi

Research output: Contribution to journalArticle

4 Citations (Scopus)

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 β transus and below β transus with air cooling. Surface characteristics, microstructural examination and mechanical properties have been investigated. Below β transus treatment creates a modification in the surface morphology with a fine dimple network. Above β 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. © 2017, The Indian Institute of Metals - IIM.
Original languageEnglish
Pages (from-to)579-587
Number of pages9
JournalTransactions of the Indian Institute of Metals
Volume71
Issue number3
DOIs
Publication statusPublished - Sep 2017

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Heat treatment
Lasers
Elongation
Tensile strength
Metals
Grain growth
Microhardness
Surface morphology
Friction
Cooling
Mechanical properties
Microstructure
titanium alloy (TiAl6V4)
Air
Temperature

Cite this

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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 β transus and below β transus with air cooling. Surface characteristics, microstructural examination and mechanical properties have been investigated. Below β transus treatment creates a modification in the surface morphology with a fine dimple network. Above β 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. {\circledC} 2017, The Indian Institute of Metals - IIM.",
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Laser Additive Manufactured Ti–6Al–4V Alloy: Heat Treatment Studies. / Chandramohan, P.; Bhero, Shepherd; Varachia, Farouk; Obadele, Babatunde Abiodun; Olubambi, Peter Apata.

In: Transactions of the Indian Institute of Metals, Vol. 71, No. 3, 09.2017, p. 579-587.

Research output: Contribution to journalArticle

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AB - 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 β transus and below β transus with air cooling. Surface characteristics, microstructural examination and mechanical properties have been investigated. Below β transus treatment creates a modification in the surface morphology with a fine dimple network. Above β 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. © 2017, The Indian Institute of Metals - IIM.

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