Very high cycle fatigue properties at 973 K of additively manufactured and conventionally processed intermetallic TiAl 48-2-2 alloy

The fatigue lives of 2nd generation γ-TiAl alloy Ti–48Al–2Cr–2Nb manufactured both by additive manufacturing using electron beam powder bed fusion (EB-PBF) as well as conventional casting process by vacuum arc remelting for comparison (REF) were investigated. Both batches (EB-PBF and REF) were subje...

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Published inMaterials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 862; p. 144507
Main Authors Schmiedel, Alexander, Burkhardt, Christina, Rudolph, Sebastian M., Weidner, Anja, Biermann, Horst
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 18.01.2023
Elsevier BV
Subjects
Additive manufacturing
Crack initiation
Crack propagation
Electron beams
Fatigue life
Fatigue strength
Fatigue tests
Gamma TiAl alloys
Grain size
Heat treating
Heat treatment
High cycle fatigue
High temperature
High-temperature materials
Hot isostatic pressing
Intermetallic compounds
Melting
Metal fatigue
Microstructure
Powder beds
Short cracks
Titanium aluminides
Titanium base alloys
Ultrasonic testing
Vacuum arc melting
Very high cycle fatigue
Very high cycle fatigue
Additive manufacturing
Gamma TiAl alloys
High-temperature materials
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Abstract The fatigue lives of 2nd generation γ-TiAl alloy Ti–48Al–2Cr–2Nb manufactured both by additive manufacturing using electron beam powder bed fusion (EB-PBF) as well as conventional casting process by vacuum arc remelting for comparison (REF) were investigated. Both batches (EB-PBF and REF) were subject to the common treatment process, i.e. hot isostatic pressing and heat treatment to achieve a duplex microstructure. As a result, a fine- and a coarse-grained microstructure consisting of γ-grains and colonies of α2/γ lamellae have evolved for the EB-PBF and conventionally cast material, respectively. Uniaxial fatigue tests were performed in the very high cycle fatigue (VHCF) range up to 109 cycles at a load ratio of R = −1 using ultrasonic fatigue testing equipment at an elevated temperature of 973 K. The SN data of both batches were discussed with respect to the influence of microstructure and temperature on the processes of crack initiation and propagation. The additive manufactured material showed superior fatigue strength compared to the conventional material due to its smaller grain size. It was shown that the fine-grained duplex microstructure of the batch EB-PBF is particularly appropriate to decrease short crack propagation at elevated temperatures due to its microstructural characteristics.
AbstractList The fatigue lives of 2nd generation γ-TiAl alloy Ti–48Al–2Cr–2Nb manufactured both by additive manufacturing using electron beam powder bed fusion (EB-PBF) as well as conventional casting process by vacuum arc remelting for comparison (REF) were investigated. Both batches (EB-PBF and REF) were subject to the common treatment process, i.e. hot isostatic pressing and heat treatment to achieve a duplex microstructure. As a result, a fine- and a coarse-grained microstructure consisting of γ-grains and colonies of α2/γ lamellae have evolved for the EB-PBF and conventionally cast material, respectively. Uniaxial fatigue tests were performed in the very high cycle fatigue (VHCF) range up to 109 cycles at a load ratio of R = −1 using ultrasonic fatigue testing equipment at an elevated temperature of 973 K. The SN data of both batches were discussed with respect to the influence of microstructure and temperature on the processes of crack initiation and propagation. The additive manufactured material showed superior fatigue strength compared to the conventional material due to its smaller grain size. It was shown that the fine-grained duplex microstructure of the batch EB-PBF is particularly appropriate to decrease short crack propagation at elevated temperatures due to its microstructural characteristics.
The fatigue lives of 2nd generation γ-TiAl alloy Ti–48Al–2Cr–2Nb manufactured both by additive manufacturing using electron beam powder bed fusion (EB-PBF) as well as conventional casting process by vacuum arc remelting for comparison (REF) were investigated. Both batches (EB-PBF and REF) were subject to the common treatment process, i.e. hot isostatic pressing and heat treatment to achieve a duplex microstructure. As a result, a fine- and a coarse-grained microstructure consisting of γ-grains and colonies of α2/γ lamellae have evolved for the EB-PBF and conventionally cast material, respectively. Uniaxial fatigue tests were performed in the very high cycle fatigue (VHCF) range up to 109 cycles at a load ratio of R = −1 using ultrasonic fatigue testing equipment at an elevated temperature of 973 K. The SN data of both batches were discussed with respect to the influence of microstructure and temperature on the processes of crack initiation and propagation. The additive manufactured material showed superior fatigue strength compared to the conventional material due to its smaller grain size. It was shown that the fine-grained duplex microstructure of the batch EB-PBF is particularly appropriate to decrease short crack propagation at elevated temperatures due to its microstructural characteristics.
ArticleNumber 144507
Author Schmiedel, Alexander
Biermann, Horst
Burkhardt, Christina
Weidner, Anja
Rudolph, Sebastian M.
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Additive manufacturing
Gamma TiAl alloys
High-temperature materials
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SSID ssj0001405
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Snippet The fatigue lives of 2nd generation γ-TiAl alloy Ti–48Al–2Cr–2Nb manufactured both by additive manufacturing using electron beam powder bed fusion (EB-PBF) as...
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StartPage 144507
SubjectTerms Additive manufacturing
Crack initiation
Crack propagation
Electron beams
Fatigue life
Fatigue strength
Fatigue tests
Gamma TiAl alloys
Grain size
Heat treating
Heat treatment
High cycle fatigue
High temperature
High-temperature materials
Hot isostatic pressing
Intermetallic compounds
Melting
Metal fatigue
Microstructure
Powder beds
Short cracks
Titanium aluminides
Titanium base alloys
Ultrasonic testing
Vacuum arc melting
Very high cycle fatigue
Title Very high cycle fatigue properties at 973 K of additively manufactured and conventionally processed intermetallic TiAl 48-2-2 alloy
URI https://dx.doi.org/10.1016/j.msea.2022.144507
https://www.proquest.com/docview/2781731726
Volume 862
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