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Type: Artigo
Title: Microstructure Evolution Of Ti-30nb-(4sn) Alloys During Classical And Step-quench Aging Heat Treatments
Author: Salvador
C. A. F.; Opini
V. C.; Lopes
E. S. N.; Caram
Abstract: Recent studies involving step-quench (SQ) heat treatments have shown that, unlike classical quench-and-aging (QA) heat treatments, SQ route can favour precipitation mechanisms that are strongly dependent on decomposition of the parent beta-phase. In this work, Ti-30Nb and Ti30Nb- 4Sn (wt-%) alloys were subjected to cold-working, recrystallisation and then to either classical or SQ heat treatments at 400 degrees C. Among QA samples,omega-phase is formed in both alloys during the heating ramp. By the SQ route, we found extensive isothermal omega-phase precipitation in Ti-30Nb during aging. On the other hand, a complete suppression of omega-phase in Ti-30Nb4Sn was observed, thus, alpha-phase precipitation could take place improving hardness while still preserving a low elastic modulus.
Subject: Titanium Alloys
Aging Heat Treatments
Phase Transformations
Microstructure Control
Editor: Taylor & Francis Ltd
Rights: fechado
Identifier DOI: 10.1080/02670836.2016.1216030
Date Issue: 2017
Appears in Collections:Unicamp - Artigos e Outros Documentos

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