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http://repositorio.unicamp.br/jspui/handle/REPOSIP/350560
Type: | Artigo |
Title: | Isothermal omega assisted alpha phase precipitation and microstructural evolution of an aged Ti-30Nb-3Fe alloy |
Author: | Mello, Mariana G. de Costa, Fernando H. Opini, Victor Resende, Arthur Cremasco, Alessandra Caram, Rubens |
Abstract: | The mechanical behavior of metastable β Ti alloys can be controlled through heat treatments. Thus, the relationship between the precipitation of α phase and the mechanical properties of these alloys is of special interest. In this work, the microstructure evolution of Ti-30Nb-3Fe alloy during aging heat treatments was evaluated using optical microscopy, scanning electron microscopy and X-ray diffraction. Moreover, Vickers hardness and elastic modulus were measured as a function of aging time. Finally, the ultimate strength and ductility of the alloy aged at 500 °C was assessed by tensile tests. In comparison to a Ti-30Nb alloy, the addition of Fe lowered the β-transus temperature, decreased the martensite start temperature to a value below room temperature, increased the precipitation temperature and reduced the dissolution temperature of ω phase, and lastly, decreased the α phase precipitation temperature. Low heating rates enabled isothermal ω phase precipitation and growth, providing favorable conditions for α phase precipitation and increasing the amount of α phase precipitates. Compared to the solution heat-treated and water-quenched condition, aging heat-treated Ti-30Nb-3Fe alloy presented higher Vickers hardness and mechanical strength, without significant loss of ductility |
Subject: | Ligas (Metalurgia) Dureza |
Country: | Brasil |
Editor: | UFSCar/Departamento de Engenharia de Materiais |
Rights: | Aberto |
Identifier DOI: | 10.1590/1980-5373-mr-2020-0026 |
Address: | https://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392020000300213 |
Date Issue: | 2020 |
Appears in Collections: | FEM - Artigos e Outros Documentos |
Files in This Item:
File | Description | Size | Format | |
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S1516-14392020000300213.pdf | 7.49 MB | Adobe PDF | View/Open |
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