Improving Forging Outcomes of Cast Titanium Aluminide Alloy via Cyclic Induction Heat Treatment

The objective of this research was to improve the forging outcome of peritectic solidifying cast titanium aluminide (TiAl) 4822 alloy (Ti-48Al-2Nb-2Cr at.%) in hot isostatic pressed and homogenised (HH) condition using cyclic induction heat treatment (CHT). This study adds to research around CHT for...

Full description

Bibliographic Details
Main Authors: Sean Peters, Aurik Andreu, Marcos Perez, Paul Blackwell
Format: Article
Language:English
Published: MDPI AG 2023-08-01
Series:Metals
Subjects:
Online Access:https://www.mdpi.com/2075-4701/13/8/1420
_version_ 1797583850360012800
author Sean Peters
Aurik Andreu
Marcos Perez
Paul Blackwell
author_facet Sean Peters
Aurik Andreu
Marcos Perez
Paul Blackwell
author_sort Sean Peters
collection DOAJ
description The objective of this research was to improve the forging outcome of peritectic solidifying cast titanium aluminide (TiAl) 4822 alloy (Ti-48Al-2Nb-2Cr at.%) in hot isostatic pressed and homogenised (HH) condition using cyclic induction heat treatment (CHT). This study adds to research around CHT for TiAl alloys by applying industrially relevant induction heating to conduct five heating cycles at the single αphase temperatures (1370 °C) necessary for grain refinement. Two cooling rates were explored in each cycle, air cooling (ACCHT) and controlled furnace-like cooling (FCCHT), without returning to room temperature. Samples were assessed at each stage in terms of their morphologies, lamellar grain size and content, as well as phase and dynamic recrystallised fraction, and subsequent primary and secondary compression behaviour with uniaxial isothermal compression. The FCCHT process resulted in a homogeneously refined fully lamellar microstructure, and ACCHT, in a heterogeneous microstructure consisting of lamellar and feathery γ (γ<sub>f</sub>) at differing fractions across the piece, depending on the cooling rate compared with HH. The results show that CHT improved forging outcomes for both compression stages investigated, resulting in uniform compression samples with higher volumes of dynamic recrystallised material compared with the instability seen with the compression of HH material.
first_indexed 2024-03-10T23:44:49Z
format Article
id doaj.art-a12434c3e3ff46a694700ca1438083c0
institution Directory Open Access Journal
issn 2075-4701
language English
last_indexed 2024-03-10T23:44:49Z
publishDate 2023-08-01
publisher MDPI AG
record_format Article
series Metals
spelling doaj.art-a12434c3e3ff46a694700ca1438083c02023-11-19T02:10:56ZengMDPI AGMetals2075-47012023-08-01138142010.3390/met13081420Improving Forging Outcomes of Cast Titanium Aluminide Alloy via Cyclic Induction Heat TreatmentSean Peters0Aurik Andreu1Marcos Perez2Paul Blackwell3Advanced Forming Research Centre, University of Strathclyde, 85 Inchinnan Drive, Inchinnan, Renfrew PA4 9LJ, UKAdvanced Forming Research Centre, University of Strathclyde, 85 Inchinnan Drive, Inchinnan, Renfrew PA4 9LJ, UKAdvanced Forming Research Centre, University of Strathclyde, 85 Inchinnan Drive, Inchinnan, Renfrew PA4 9LJ, UKAdvanced Forming Research Centre, University of Strathclyde, 85 Inchinnan Drive, Inchinnan, Renfrew PA4 9LJ, UKThe objective of this research was to improve the forging outcome of peritectic solidifying cast titanium aluminide (TiAl) 4822 alloy (Ti-48Al-2Nb-2Cr at.%) in hot isostatic pressed and homogenised (HH) condition using cyclic induction heat treatment (CHT). This study adds to research around CHT for TiAl alloys by applying industrially relevant induction heating to conduct five heating cycles at the single αphase temperatures (1370 °C) necessary for grain refinement. Two cooling rates were explored in each cycle, air cooling (ACCHT) and controlled furnace-like cooling (FCCHT), without returning to room temperature. Samples were assessed at each stage in terms of their morphologies, lamellar grain size and content, as well as phase and dynamic recrystallised fraction, and subsequent primary and secondary compression behaviour with uniaxial isothermal compression. The FCCHT process resulted in a homogeneously refined fully lamellar microstructure, and ACCHT, in a heterogeneous microstructure consisting of lamellar and feathery γ (γ<sub>f</sub>) at differing fractions across the piece, depending on the cooling rate compared with HH. The results show that CHT improved forging outcomes for both compression stages investigated, resulting in uniform compression samples with higher volumes of dynamic recrystallised material compared with the instability seen with the compression of HH material.https://www.mdpi.com/2075-4701/13/8/1420intermetallicstitanium aluminidesheat treatmentinduction heating
spellingShingle Sean Peters
Aurik Andreu
Marcos Perez
Paul Blackwell
Improving Forging Outcomes of Cast Titanium Aluminide Alloy via Cyclic Induction Heat Treatment
Metals
intermetallics
titanium aluminides
heat treatment
induction heating
title Improving Forging Outcomes of Cast Titanium Aluminide Alloy via Cyclic Induction Heat Treatment
title_full Improving Forging Outcomes of Cast Titanium Aluminide Alloy via Cyclic Induction Heat Treatment
title_fullStr Improving Forging Outcomes of Cast Titanium Aluminide Alloy via Cyclic Induction Heat Treatment
title_full_unstemmed Improving Forging Outcomes of Cast Titanium Aluminide Alloy via Cyclic Induction Heat Treatment
title_short Improving Forging Outcomes of Cast Titanium Aluminide Alloy via Cyclic Induction Heat Treatment
title_sort improving forging outcomes of cast titanium aluminide alloy via cyclic induction heat treatment
topic intermetallics
titanium aluminides
heat treatment
induction heating
url https://www.mdpi.com/2075-4701/13/8/1420
work_keys_str_mv AT seanpeters improvingforgingoutcomesofcasttitaniumaluminidealloyviacyclicinductionheattreatment
AT aurikandreu improvingforgingoutcomesofcasttitaniumaluminidealloyviacyclicinductionheattreatment
AT marcosperez improvingforgingoutcomesofcasttitaniumaluminidealloyviacyclicinductionheattreatment
AT paulblackwell improvingforgingoutcomesofcasttitaniumaluminidealloyviacyclicinductionheattreatment