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Abstract
The competitive formation of allotriomorphic α along the prior β grain boundaries, secondary α-phase and the growth of globular primary α is described for the Ti-6Al-4V alloy during continuous cooling. The formation kinetics of the different morphologies of the α-phase is related to the nucleation rate of allotriomorphic α and secondary α as well as with the V supersaturation at the β matrix. A mesoscale physical model is developed for the allotriomorphic α and secondary α based on classical nucleation and growth of platelets. The growth of the primary α is modelled as the growth of a spherical particle embedded in a supersaturated β matrix. Continuous cooling tests at two different holding temperatures in the α+β field, 930 °C and 960 °C, and five different cooling rates, 10, 30, 40, 100 and 300 °C/minutes, are conducted. Additionally, interrupted tests are conducted at different temperatures to determine the progress of growth of primary α and formation of allotriomorphic and secondary α-phases during cooling. The size of primary α increases, while its circularity decreases with decreasing cooling rate. The area fractions of primary α decrease with increasing cooling rate and increasing holding temperature. Moreover, the lower the cooling rate, the thicker the plates of allotriomorphic α and secondary α. The growth of primary α, as well as the formation of allotriomorphic α plates is observed at the beginning of the cooling stage. The formation of secondary α occurs at last and is nearly negligible for very low cooling rates. The model is able to accurately predict the different α-phase formation behaviours and the obtained results show good agreement with the experimental ones.
Originalsprache | englisch |
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Seiten (von - bis) | 3967-3980 |
Seitenumfang | 14 |
Fachzeitschrift | Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science |
Jahrgang | 51 |
Ausgabenummer | 8 |
DOIs | |
Publikationsstatus | Veröffentlicht - 1 Aug. 2020 |
ASJC Scopus subject areas
- Metalle und Legierungen
- Werkstoffwissenschaften (sonstige)
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CD-Labor für Design von Hochleistungslegierungen mittels thermo-mechanischer Prozesstechnik
Poletti, M. C. (Teilnehmer (Co-Investigator)), Buzolin, R. H. (Teilnehmer (Co-Investigator)), Wang, R. (Teilnehmer (Co-Investigator)), Godavarthy Anantha Venkata, R. K. P. (Teilnehmer (Co-Investigator)), Miller Branco Ferraz, F. (Teilnehmer (Co-Investigator)), Fortmüller, S. (Teilnehmer (Co-Investigator)) & Baumann, G. (Teilnehmer (Co-Investigator))
1/05/17 → 30/04/25
Projekt: Forschungsprojekt