Effect of inter-pass annealing on the deformation microstructure of Ti-48Al-2Cr-2Nb alloy

Chen, Xiaofei; Tang, Bin; Chen, Wei; Yang, Yang; Zheng, Guoming; Fan, Zizhao; Li, Jinshan

doi:10.1016/j.jallcom.2022.167751

Cited by 8 publications

(2 citation statements)

References 40 publications

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“…Compared to the performance reported in the literature, the alloy performance in this study was excellent, as shown in Table 3. CHT 697 -2.1 Ti-48Al-2Cr-2Nb [24] Forging 474 357 1.64 Ti-48Al-2Cr-2Nb [25] HT 477 577 1.2 Ti-44.5Al-1.0Cr-2.5V-2.0Mo [26] HE 540 481 -Ti-48Al-2Cr-2Nb [2] EBM 855 -2.1…”

Section: Discussionmentioning

confidence: 99%

The Effect of Heat Treatment on the Microstructure and Mechanical Properties of Powder Metallurgy Ti-48Al Alloy

Yan,

Zhang,

Yang

et al. 2024

Metals

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Heat treatment is the critical step in achieving a refined microstructure and enhanced mechanical properties of TiAl-based alloys. This study investigated the influence of heat treatment temperature, cooling method, and heat treatment time on the microstructure and mechanical properties of an extruded powder metallurgy Ti-48Al alloy, and achieved the control of fully lamellar fine microstructures and the enhancement of performance through a simple heat treatment, rather than the traditional approach of homogenization followed by heat treatment. The results indicate that the heat treatment temperature determines the type of microstructure, while the cooling rate dictates the lamellar width. As the heat treatment temperature was increased from the two-phase region to the α single-phase region, the microstructure transitioned from duplex to near lamellar, and the alloy strength initially increased and then decreased, influenced by both the lamellar colony ratio and grain size. A rapid cooling rate (water quenching) induces a non-diffusive massive phase transformation, whereas a slow cooling rate (air cooling) gradually forms α2/γ lamellar colonies. Therefore, a suitable heat treatment regime for the powder metallurgy Ti-48Al alloy was determined to be 1340 °C/5 min/air cooling. The microstructure of the alloy was near lamellar, consisting of lamellar colonies approximately 50 μm and a small number of γ equiaxed grains of about 10 μm. Subsequently, the alloy exhibited a room temperature tensile strength of 784 MPa and a yield strength of 763 MPa, representing improvements of 17.0% and 38.7% over the extruded alloy, respectively. This research provides a reference for establishing a heat treatment process for powder metallurgy TiAl alloys.

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Section: Discussionmentioning

confidence: 99%

The Effect of Heat Treatment on the Microstructure and Mechanical Properties of Powder Metallurgy Ti-48Al Alloy

Yan,

Zhang,

Yang

et al. 2024

Metals

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“…The authors identified that the lamellar characteristics, especially lamellar grain sizes, were the most significant factor influencing the flow stress, with Semiatin, Seetharaman, and Ghosh identifying the effect that grain size and strain rate have on the globularised fraction [35]. Another factor in the X-DRX and the globularised fraction is the heterogeneous strain distribution across the work piece [38]. This is shown by the microstructural analysis of lamellar content at P1 and P2 (Table 6).…”

Section: Primary Compression: Accht Microstructurementioning

confidence: 96%

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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Effects of recrystallization on interfacial microstructure evolution and shear strength of TiAl alloy joints

Ma,

Tang,

Wang

et al. 2024

Intermetallics

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Effect of inter-pass annealing on the deformation microstructure of Ti-48Al-2Cr-2Nb alloy

Cited by 8 publications

References 40 publications

The Effect of Heat Treatment on the Microstructure and Mechanical Properties of Powder Metallurgy Ti-48Al Alloy

The Effect of Heat Treatment on the Microstructure and Mechanical Properties of Powder Metallurgy Ti-48Al Alloy

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

Effects of recrystallization on interfacial microstructure evolution and shear strength of TiAl alloy joints

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