Effect of Solution Treatment and Short Time Aging on Mechanical Properties of Cast Ti-6Al-4V Alloy

Oh, Seong-Tak; Woo, Kee-Do; Kwak, Seung-Mi; Kim, Jae Hwang

doi:10.3740/mrsk.2016.26.5.287

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…However, the problem of this heat treatment for the α 2 phase is that it takes a relatively long aging time generally over 360000 s. 5,7) On the other hand, several studies have reported that strength and ductility are more improved by solution treatment and subsequent aging for a short time of about 70 s, resulting from a strain-induced martensite transformation of the retained β phase under deformation. 2,8,9) This result indicates that the combination of strength and ductility of Ti-6Al-4V alloy can be further improved by retained β phase, even for a short time. Although Ti-6Al-4V alloy has various kinds of microstructures, however, the above studies for short-time heat treatments of Ti6Al-4V alloy were performed by using the equiaxial microstructure of wrought alloys as a starting microstructure.…”

Section: Introductionmentioning

confidence: 58%

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Effect of Retained β Phase on Mechanical Properties of Cast Ti-6Al-4V Alloy

Woo

Kim

et al. 2017

Mater. Trans.

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We investigated effect of retained β phase on mechanical properties of cast Ti-6Al-4V alloy, after solution treatment and subsequent aging for a short time. The alloy was solution-treated at 1123, 1223 K in the α + β phase region and 1323 K in the β phase region for 1800 s, followed by water quenching. After that, as-quenched specimens were aged at 823 K for 300 s. The peak hardness of heat-treated specimens was obtained by solution treatment at each solution temperature and followed by aging at 823 K for 300 s. It was due to ne α phase transformed from the retained β phase. The tensile strength of specimen as-quenched at 1223 K and subsequent aged at 823 K for 300 s was increased, without signi cantly decreased ductility. This was due to the ne α phase transformed from the retained β phase by subsequent aging for 300 s. This behavior of increased strength without dramatically decreased ductility might be caused by the transformation induced plasticity (TRIP) effect, which is the strain-induced martensite transformation from the retained β phase throughout deformation, even after aging at 823 K for 300 s.

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Section: Introductionmentioning

confidence: 58%

“…The dark region is made of α phase with a thickness of about 4 µm, whereas thin bright region is shown as the β phase. The transformation from the β phase (bcc) to α phase (hcp) can occur along orientation relationship of (110) β //(0002) α and [1][2][3][4][5][6][7][8][9][10][11] β // [11][12][13][14][15][16][17][18][19][20] α .…”

Section: Methodsmentioning

confidence: 99%

Effect of Retained β Phase on Mechanical Properties of Cast Ti-6Al-4V Alloy

Woo

Kim

et al. 2017

Mater. Trans.

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Study of Microstructure, Mechanical Properties, and Corrosion Behavior of As-Cast Ni-Ti and Ti-6Al-4V Alloys

Elshaer

Ibrahim

2022

J. of Materi Eng and Perform

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Ni-Ti and Ti-6Al-4V alloys were cast as ingots using vacuum arc remelting furnace. The microstructure of as-cast Ni-Ti alloy consists of NiTi matrix as well as Ti2Ni dendrites. As-cast Ti-6Al-4V alloy revealed a structure composed of equiaxed β grains and varied α-phase morphologies. Ti-6Al-4V alloy registered maximum ultimate compressive strength of 2042 MPa, and also reported large reduction in height (18%). However, Ni-Ti alloy showed minimum ultimate compressive strength of 1804 MPa and low reduction in height (3%). The wear rate of both as-cast Ni-Ti and Ti-6Al-4V alloys significantly increased with saline solution (0.9% NaCl) condition compared to the dry testing condition. Saline solution harmed the wear resistance by about 2-4 times compared to the dry conditions. The corrosion rate of Ti-6Al-4V in saline solution (0.9% NaCl) was 0.000171 mm/yr which is almost half the value of Ni-Ti alloy (0.00038 mm/yr).

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Temperature dependent constitutive plastic flow behaviour of titanium alloy Ti6Al4V

Mehta

2023

International Journal of Materials Research

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The constitutive relationship between stress and strain for titanium alloy Ti6Al4V has been investigated using tensile tests at four different temperatures that is room temperature, 200 °C, 400 °C, and 550 °C. Detail observations on the variation of nature of flow curves in the work hardening regime have been reported at different test temperatures. At room temperature and 550 °C, the flow curves are found to be linear in nature and follow the Hollomon relationship. The flow curves at 200 and 400 °C exhibit non-linear nature and demonstrate Ludwigson relationship. The various constant parameters of above relationships influence the overall strength and ductility of the alloy at different temperatures. The alloy shows presence of premature plastic instability or inflection points in the early period of flow curves and displays a fast decrease in work hardening rate at room temperature and 550 °C, which in turn results in lower values of strain to fracture.

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Effect of Solution Treatment and Short Time Aging on Mechanical Properties of Cast Ti-6Al-4V Alloy

Cited by 3 publications

References 6 publications

Effect of Retained β Phase on Mechanical Properties of Cast Ti-6Al-4V Alloy

Effect of Retained β Phase on Mechanical Properties of Cast Ti-6Al-4V Alloy

Study of Microstructure, Mechanical Properties, and Corrosion Behavior of As-Cast Ni-Ti and Ti-6Al-4V Alloys

Temperature dependent constitutive plastic flow behaviour of titanium alloy Ti6Al4V

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