Strength-Ductility Relationship in Solution Treated and Aged .ALPHA.+.BETA. Type Ti-4.5%Al-3%V-2%Fe-2%Mo Titanium Alloy

Fukai, Hideaki; Minakawa, Kuninori; Ouchi, Chiaki

doi:10.2355/isijinternational.44.1911

Cited by 11 publications

(6 citation statements)

References 2 publications

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“…Fukai et al also reported that hardness of primary a in SP-700 alloy was almost constant in a wide range of ST temperature. 22) These results indicate that a variation of chemical composition in a phase with ST temperature exerts very tiny influence on hardness of this phase. As shown in Fig.…”

Section: Transformation Of B B Phase and The Phase Map Of New Alloymentioning

confidence: 91%

“…Strength or hardness in aϩb titanium alloys with two-phase microstructure such as Ti-6Al-4V and SP-700 alloys was well analyzed based on the law of mixture for strength which was consisted of the terms of the volume fraction and strength or hardness in a respective phase. 4,22) Hardness of primary a in new alloy was about 310, and this value was varied very little by ST temperature. Fukai et al also reported that hardness of primary a in SP-700 alloy was almost constant in a wide range of ST temperature.…”

Section: Transformation Of B B Phase and The Phase Map Of New Alloymentioning

confidence: 98%

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Variations in the Microstructure and Hardness with Solution Treating and Aging Conditions in New .ALPHA.+.BETA. Titanium Alloy Ti-4.5%Al-6%Nb-2%Fe-2%Mo

et al. 2007

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Section: Transformation Of B B Phase and The Phase Map Of New Alloymentioning

confidence: 91%

Section: Transformation Of B B Phase and The Phase Map Of New Alloymentioning

confidence: 98%

Variations in the Microstructure and Hardness with Solution Treating and Aging Conditions in New .ALPHA.+.BETA. Titanium Alloy Ti-4.5%Al-6%Nb-2%Fe-2%Mo

et al. 2007

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“…14) It has been reported that the Ti-4.5Al-3V-2Fe-2Mo alloy may exhibit notch brittleness depending on heat treatment conditions. 15) For Ti-4.5Al-3V-2Fe-2Mo welds, PWHTs at 704°C or higher cause a coarsening of aϩb structures and result in a reduced notch brittleness. 16) Titanium alloys have been widely applied to aerospace and military industries at the temperature often below 550°C.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Microstructures on the Notched Tensile Fracture of Ti–6Al–6V–2Sn Welds at Elevated Temperatures

2010

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Notched tensile tests of Ti-6Al-6V-2Sn welds, which were subjected to distinct post-weld heat treatments (PWHTs), were carried out in air at 150, 300 and 450°C. The results were compared with those of mill-annealed base metal (MB) specimens tested at same temperatures. The notched tensile strength (NTS) of the MB specimens decreased significantly with increasing temperature. Moreover, the welds with high hardness showed notch brittleness at room temperature but had a higher NTS than the MB specimen. The presence of grain boundary a layer promoted grain boundary shear, therefore, reduced its notch brittleness at room temperature for the weld with the PWHT at 704°C (the W-704 specimen). A lack of deformation compatibility at the interfaces between the a and b phases caused interfacial separations in the MB specimen as well as void formation in the W-704 specimen, leading to the low NTS of these specimens at elevated temperatures.KEY WORDS: notched tensile test; Ti-6Al-6V-2Sn; post-weld heat treatment.

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“…For instance, the holding time required to attain the peak hardness at 500 C is less than two hours, which is considerably shorter than that of most heat-treatable titanium alloys. 7,8) The Ti-4.5Al-3V-2Mo-2Fe alloy has higherstabilizing element content, which modifies the transformation of the phase and suppresses the diffusional transformation during cooling and quench delay. 6) Among thestabilizing elements in the alloy, Fe is an effective strengthener and Mo refines the microstructure and retards grain growth during superplastic forming and heat treatment.…”

Section: Introductionmentioning

confidence: 99%

“…10) The Ti-4.5Al-3V-2Mo-2Fe alloy exhibits a wide variety of microstructures depending on heat treatment conditions, 6,7) however, less attention has been paid to the weld metal microstructure and associated properties of post-weld heat-treated welds. In general, PWHTs in þ titanium alloys are performed not only for stress relief, but also for improved ductility and toughness of the weld metal.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Notch Properties of Heat-Treated Ti-4.5Al-3V-2Mo-2Fe Laser Welds

2009

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The microstructure and transformation behavior of Ti-4.5Al-3V-2Mo-2Fe alloy and its laser welds after various heat treatments were investigated. Notch properties, such as impact toughness and notched tensile strength, were also measured on the welds to choose an appropriate post-weld heat treatment (PWHT) of the alloy. The temperature regimes in which transformed into 0 , 00 or retained as after quenching were identified and discussed. The results indicated that 00 could be obtained primarily by rapid quenching from 880$840 C solution temperatures and was identified as a base-centered orthorhombic (centered on the C face) with the lattice parameters of a ¼ 0:305 nm, b ¼ 0:489 nm, and c ¼ 0:457 nm. The as-welded specimen exhibited fine acicular in the matrix with hardness considerably higher than the mill-annealed base metal. For a PWHT temperature lower than 800 C, the change in microstructure and hardness of the welds depended mainly on the temperature, not on the cooling rate. If the PWHT temperature was higher than 800 C, both the temperature and the cooling rate were important in altering microstructure and hardness of the welds. The welds after a 704 C/4 h treatment could prevent notch brittleness, reduce hardness variation in different regions of the weld, and obtain notch properties similar to the mill-annealed base metal.

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Strength-Ductility Relationship in Solution Treated and Aged .ALPHA.+.BETA. Type Ti-4.5%Al-3%V-2%Fe-2%Mo Titanium Alloy

Cited by 11 publications

References 2 publications

Variations in the Microstructure and Hardness with Solution Treating and Aging Conditions in New .ALPHA.+.BETA. Titanium Alloy Ti-4.5%Al-6%Nb-2%Fe-2%Mo

Variations in the Microstructure and Hardness with Solution Treating and Aging Conditions in New .ALPHA.+.BETA. Titanium Alloy Ti-4.5%Al-6%Nb-2%Fe-2%Mo

The Influence of Microstructures on the Notched Tensile Fracture of Ti–6Al–6V–2Sn Welds at Elevated Temperatures

Microstructure and Notch Properties of Heat-Treated Ti-4.5Al-3V-2Mo-2Fe Laser Welds

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