Influence of Temperature and Strain Rate on Microstructural Evolution During Hot Compression of Ti-45Al-xNb-0.2C-0.2B Titanium Aluminide Alloys

Bibhanshu, Nitish; Bhattacharjee, Anup Kumar; Suwas, Satyam

doi:10.1007/s11837-019-03722-2

Cited by 7 publications

(3 citation statements)

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“…HH material showed the highest lamellar grain sizes in this study; this resulted in non-uniform deformation and flow localisation caused by the large grained fully lamellar microstructure [34][35][36]. Flow localisation then led to poor conditions for globularisation, with the post-compression HH material resulting in the highest lamellar content and size values at both P1 and P2.…”

Section: Primary Compression: Accht Microstructurementioning

confidence: 74%

Section: Primary Compression Behaviourmentioning

confidence: 85%

“…Table 4 illustrates the samples after deformation, with HH material showing evidence of localised shear. As geometry, die, lubrication, and compression conditions were the same across the three tests, this is a sign of flow localisation caused by the large grained fully lamellar microstructure [34][35][36]. With heating to the compression temperature and soaking for 5 min (1100 °C, high γ + α2), the packets of γf present in ACCHT material, present as both γf-int and γf-gb forms, largely transformed to fine γeq grains, as shown by comparing Figures 7 and 8, with microstructural characteristics summarised in Table 5.…”

Section: Primary Compression Behaviourmentioning

confidence: 88%

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

Peters

Andreu

Pérez

et al. 2023

Metals

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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 (γf) 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.

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Section: Primary Compression: Accht Microstructurementioning

confidence: 74%

Section: Primary Compression Behaviourmentioning

confidence: 85%