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Metals and Materials International

Erschienen in:

29.05.2019

Thermal Decomposition of Massive Phase to Fine Lamellar α/β in Ti–6Al–4V Additively Manufactured Alloy by Directed Energy Deposition

verfasst von: Ghozali Suprobo, Abdul Azis Ammar, Nokeun Park, Eung Ryul Baek, Sungwook Kim

Erschienen in: Metals and Materials International | Ausgabe 6/2019

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Abstract

The occurrence of a massive phase (α_m) transformation and a thermal decomposition of an α_m to fine lamellar α/β with an α lamellar width of approximately 1 µm have been identified in additively manufactured Ti–6Al–4V alloy by directed energy deposition. The β to α_m phase transformation during additive manufacturing generated a high dislocation density, which was calculated by the kernel average misorientation. This caused a significant change in the Gibbs free energy of α, resulting in the nucleation of the β phase becoming preferable in the area with high dislocation density at temperature below the β-transus temperature. Subsequent annealing at 850 °C altered the massive morphology to lamellar due to the formation of a β phase between α lamellar boundaries.

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Vorheriger Artikel Effects of Ta Content on Thermodynamic Properties and Transformation Temperatures of Shape Memory NiTi Alloy

Nächster Artikel Efficiency Analysis of Shot Peening Parameters on Variations of Hardness, Grain Size and Residual Stress via Taguchi Approach

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Titel: Thermal Decomposition of Massive Phase to Fine Lamellar α/β in Ti–6Al–4V Additively Manufactured Alloy by Directed Energy Deposition
verfasst von: Ghozali Suprobo
Abdul Azis Ammar
Nokeun Park
Eung Ryul Baek
Sungwook Kim
Publikationsdatum: 29.05.2019
Verlag: The Korean Institute of Metals and Materials
Erschienen in: Metals and Materials International / Ausgabe 6/2019
Print ISSN: 1598-9623
Elektronische ISSN: 2005-4149
DOI: https://doi.org/10.1007/s12540-019-00304-4

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