Development of a Novel Heat Treatment Method to Achieve a Fine-grained Near Lamellar Microstructure in Ti-48Al-2Cr-2Nb Intermetallic

Document Type : Manufacturing and Production

Authors

1 Ph.D. Student, Faculty of Materials and Manufacturing Technologies, Malek-e-Ashtar University of Technology, Tehran, Iran

2 Corresponding author: Associate Professor, Faculty of Materials and Manufacturing Technologies, Malek-e-Ashtar University of Technology, Tehran, Iran

3 Associate Professor, Faculty of Metallurgy and Material Engineering, Hamedan University of Technology, Hamedan, Iran

Abstract

The aim of the current research is to achieve a fine grain structure (less than 200 micrometers) in Ti-48Al-2Cr-2Nb Intermetallic by a three-step heat treatment and to investigating the parameters affecting this process. For this purpose, after the homogenization at 1175 C for 24 hours for eliminating the cast structure, three-stage heat treatment including the first stage (single-phase annealing at 1400 C for one hour with cooling in furnace and air environments), the second stage (cyclic operations including repeated heating up to 1400 C for three, five and ten cycles and cooling in air and water environments) and the third stage (Two-phase annealing at temperatures of 1175, 1225 and 1275 C  for one hour) was performed. Finally, single-phase annealing at 1400°C for one hour and cooling in the furnace, then cyclic heat treatment with five cycles at the same temperature with cooling in air and annealing at 1225°C for one hour is suggested as the optimal process to create a semi-lamellar structure with the smallest colony size.

Highlights

  • Three-stage heat treatment
  • First step: single-phase annealing at 1400 °C for one hour and cooling in the furnace.
  • Second stage: Cyclic heat treatment (five cycles) and cooling in air
  • Third step: annealing at 1225°C for one hour and cooling in air

Keywords

Main Subjects


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References

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Aerospace Mechanics
Volume 20, Issue 3 - Serial Number 77
Serial No. 77, Summer
November 2024
Pages 47-57

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History

  • Receive Date: 03 May 2024
  • Revise Date: 23 May 2024
  • Accept Date: 01 June 2024
  • Publish Date: 21 November 2024

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