Improvement of Ti6Al4V fracture toughness by sub-transus heat treatment

Plaza, Luis M.; Irisarri, A.M.; Gil-Negrete, A.

doi:10.1016/0956-716x(90)90543-p

Cited by 8 publications

(10 citation statements)

References 2 publications

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“…BA samples were annealed in the beta field at 1030 °C for 30 min, air cooled and aged for 2 h at 730 °C, and again air cooled. This heat treatment was chosen because it was observed in a previous study that samples in this condition possessed the maximum fracture toughness although with the drawback of a very poor ductility 6 . The second heat treatment consisted in annealing at 940 °C, inside the alpha–beta field for 4 h, furnace cooling to 700 °C followed by air cooling, to obtain a good combination of ductility and toughness.…”

Section: Methodsmentioning

confidence: 99%

Creep failure mechanisms of a Ti‐6Al‐4V thick plate

Seco¹,

Irisarri²

2001

Fatigue Fract Eng Mat Struct

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The creep failure operating mechanisms of a 17‐mm thick plate of a Ti–6Al–4V alloy in various heat treating conditions have been investigated. Specimens in the as‐received, mill‐annealed, condition (50 min maintenance at 720 °C and air cooled as the final step of the thermomechanical process) showed the lowest creep resistance and their metallographic analysis revealed that the temperature‐activated dislocation climb was the mechanism responsible for the failure and that observed holes were generated by plastic deformation, rather than by creep cavitation. Conversely, maximum times to failure were recorded in beta‐annealed specimens (1030 °C for 30 min, air cooled and aged for 2 h at 730 °C). The fracture surfaces of these broken specimens exhibited an intergranular morphology that was attributed to grain boundary sliding along the former beta grains. Finally, alpha–beta field‐annealed samples (940 °C 4 h, and furnace cooled to 700 °C) possessed intermediate lives between those of mill‐annealed and beta‐annealed specimens and the failure operating mechanism was diffusional creep by the nucleation and coalescence of the creep cavities generated at the alpha–beta interfaces and the triple points.

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Section: Methodsmentioning

confidence: 99%

Creep failure mechanisms of a Ti‐6Al‐4V thick plate

Seco¹,

Irisarri²

2001

Fatigue Fract Eng Mat Struct

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“…1) Thermal treatment of Ti-6A1-4V in the þ field has been found to produce a marked increase in toughness, but it results in a slight loss in ductility and strength as compared to the mill-annealed Ti-6A1-4V. 2) In the and þ alloys, the acicular microstructure has been reported to have higher fracture toughness than the equiaxed structure.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Preheating on Notched Tensile Strength and Impact Toughness of Ti-6Al-6V-2Sn Laser Welds

2011

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Notched tensile strength (NTS) and impact toughness were determined for Ti-6Al-6V-2Sn laser welds subjected to post-weld heat treatment (PWHT) at distinct temperatures. In this study, the specimens were either preheated at 300 C or maintained at room temperature before laser welding. The preheated weld, associated with a reduced cooling rate, had obviously lower hardness than the non-preheated weld in the as-welded condition. After PWHT at 482 C for 3 h, the preheated weld also exhibited considerably lower hardness than the non-preheated weld. In general, preheating at 300 C could effectively increase the NTS and impact toughness of Ti-6Al-6V-2Sn laser welds. The preheated weld in the as-welded condition had superior NTS to other welds being tested. On the other hand, the welds after PWHT at 704 C possessed the best resistance to unstable impact fracture, regardless of preheating. Usually, the coarse þ structures together with intergranular were responsible for the high NTS and impact toughness of the weld.

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“…16) Heat treatment of Ti-6A1-4V in þ field is found to produce a marked increase in toughness but a slight loss in ductility and strength as compared to that in mill-annealed condition. 16,17) In the and þ alloys, the acicular microstructure is reported to have higher fracture toughness than the equiaxed one.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Preheating on Notch Fracture of Ti-4.5Al-3V-2Fe-2Mo Laser Welds

2009

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Notched tensile strength (NTS) and impact fracture toughness were determined for Ti-4.5Al-3V-2Fe-2Mo laser welds subjected to postweld heat treatment (PWHT) at distinct temperatures. In the welding process, the specimens were preheated at 300 C to reduce the cooling rate of the welds, and the results were compared with the non-preheated welds. Generally, the preheated welds had coarser þ structures and showed slower responses to age-hardening in PWHTs than the non-preheated welds. The decreased hardness and accompanied ductility enhancement resulted in the improved notch brittleness and impact toughness of the preheated welds, relative to the non-preheated welds. As the PWHT temperature of the welds increased, the coarsening of grain boundary assisted grain boundary sliding and formed intergranular dimple fractures on the fracture surface.

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Improvement of Ti6Al4V fracture toughness by sub-transus heat treatment

Cited by 8 publications

References 2 publications

Creep failure mechanisms of a Ti‐6Al‐4V thick plate

Creep failure mechanisms of a Ti‐6Al‐4V thick plate

The Effect of Preheating on Notched Tensile Strength and Impact Toughness of Ti-6Al-6V-2Sn Laser Welds

The Effect of Preheating on Notch Fracture of Ti-4.5Al-3V-2Fe-2Mo Laser Welds

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