Al-Li alloys – the analysis of material behaviour during industrial hot forging

Research output: Contribution to journalConference Contribution

Abstract

Al-Li alloys are a promising class of aerospace materials that combine light weight with high strength, comparable to those of steels. In the case of critical components, it is well known that providing the required reliability is impossible without tailoring the output microstructure of the material. This, in turn, requires a clear understanding of the logic behind microstructure formation depending on the total processing history (especially temperature and strain-rate history). However, uniaxial isothermal laboratory tests provide very limited information about the material behaviour. Real forging processes, especially involving complex geometries, sometimes develop quite complicated temperature-strain-rate paths that vary across the deformed part. A proper analysis of the microstructural transformations taking place in the material under these conditions is therefore very important. In this paper, the correlation between the loading history and microstructural transformations was analysed for AA2099 alloy using the hot forging of a disk-shaped component at selected forging temperatures and strain rates. The obtained results were compared to industrial processing maps based on uniaxial tests.

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Forging
Strain rate
Microstructure
Processing
Temperature
Geometry
Steel

Keywords

  • AA2099
  • hot-forging
  • flow stability
  • microstructure

Cite this

@article{a5e36492aa094cb2b82ef4dc279cc816,
title = "Al-Li alloys – the analysis of material behaviour during industrial hot forging",
abstract = "Al-Li alloys are a promising class of aerospace materials that combine light weight with high strength, comparable to those of steels. In the case of critical components, it is well known that providing the required reliability is impossible without tailoring the output microstructure of the material. This, in turn, requires a clear understanding of the logic behind microstructure formation depending on the total processing history (especially temperature and strain-rate history). However, uniaxial isothermal laboratory tests provide very limited information about the material behaviour. Real forging processes, especially involving complex geometries, sometimes develop quite complicated temperature-strain-rate paths that vary across the deformed part. A proper analysis of the microstructural transformations taking place in the material under these conditions is therefore very important. In this paper, the correlation between the loading history and microstructural transformations was analysed for AA2099 alloy using the hot forging of a disk-shaped component at selected forging temperatures and strain rates. The obtained results were compared to industrial processing maps based on uniaxial tests.",
keywords = "AA2099, hot-forging, flow stability, microstructure",
author = "Olga Bylja and Ares Gomez-Gallegos and Nicola Stefani and Paul Blackwell",
year = "2017",
month = "11",
day = "15",
doi = "10.1016/j.proeng.2017.10.729",
language = "English",
volume = "207",
pages = "7--12",
journal = "Procedia Engineering",
issn = "1877-7058",

}

Al-Li alloys – the analysis of material behaviour during industrial hot forging. / Bylja, Olga; Gomez-Gallegos, Ares; Stefani, Nicola; Blackwell, Paul.

In: Procedia Engineering, Vol. 207, 15.11.2017, p. 7-12.

Research output: Contribution to journalConference Contribution

TY - JOUR

T1 - Al-Li alloys – the analysis of material behaviour during industrial hot forging

AU - Bylja, Olga

AU - Gomez-Gallegos, Ares

AU - Stefani, Nicola

AU - Blackwell, Paul

PY - 2017/11/15

Y1 - 2017/11/15

N2 - Al-Li alloys are a promising class of aerospace materials that combine light weight with high strength, comparable to those of steels. In the case of critical components, it is well known that providing the required reliability is impossible without tailoring the output microstructure of the material. This, in turn, requires a clear understanding of the logic behind microstructure formation depending on the total processing history (especially temperature and strain-rate history). However, uniaxial isothermal laboratory tests provide very limited information about the material behaviour. Real forging processes, especially involving complex geometries, sometimes develop quite complicated temperature-strain-rate paths that vary across the deformed part. A proper analysis of the microstructural transformations taking place in the material under these conditions is therefore very important. In this paper, the correlation between the loading history and microstructural transformations was analysed for AA2099 alloy using the hot forging of a disk-shaped component at selected forging temperatures and strain rates. The obtained results were compared to industrial processing maps based on uniaxial tests.

AB - Al-Li alloys are a promising class of aerospace materials that combine light weight with high strength, comparable to those of steels. In the case of critical components, it is well known that providing the required reliability is impossible without tailoring the output microstructure of the material. This, in turn, requires a clear understanding of the logic behind microstructure formation depending on the total processing history (especially temperature and strain-rate history). However, uniaxial isothermal laboratory tests provide very limited information about the material behaviour. Real forging processes, especially involving complex geometries, sometimes develop quite complicated temperature-strain-rate paths that vary across the deformed part. A proper analysis of the microstructural transformations taking place in the material under these conditions is therefore very important. In this paper, the correlation between the loading history and microstructural transformations was analysed for AA2099 alloy using the hot forging of a disk-shaped component at selected forging temperatures and strain rates. The obtained results were compared to industrial processing maps based on uniaxial tests.

KW - AA2099

KW - hot-forging

KW - flow stability

KW - microstructure

U2 - 10.1016/j.proeng.2017.10.729

DO - 10.1016/j.proeng.2017.10.729

M3 - Conference Contribution

VL - 207

SP - 7

EP - 12

JO - Procedia Engineering

T2 - Procedia Engineering

JF - Procedia Engineering

SN - 1877-7058

ER -