CN104726746A - High-strength metastable beta-type titanium alloy bar and production method thereof - Google Patents

High-strength metastable beta-type titanium alloy bar and production method thereof Download PDF

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CN104726746A
CN104726746A CN201510184681.6A CN201510184681A CN104726746A CN 104726746 A CN104726746 A CN 104726746A CN 201510184681 A CN201510184681 A CN 201510184681A CN 104726746 A CN104726746 A CN 104726746A
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titanium alloy
forging
bar
type titanium
strength
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CN201510184681.6A
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CN104726746B (en
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程军
牛金龙
于振涛
余森
刘少辉
张亚峰
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西北有色金属研究院
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Abstract

The invention discloses a high-strength metastable beta-type titanium alloy bar. The high-strength metastable beta-type titanium alloy bar comprises, by atomic percent, 13% of Al, 5% of V, 5% of Mo, 4%-6% of Cr and the balance Ti and inevitable impurities. Additionally, the invention further discloses a production method of the high-strength metastable beta-type titanium alloy bar. The production method includes firstly, preparing titanium alloy casting ingots; secondly, producing forging billets by billet forging; thirdly, producing a semi-finished titanium alloy bar by upsetting and stretching forging and radial forging; fourthly, subjecting the semi-finished titanium alloy bar to solid solution treatment and aging treatment so as to obtain the metastable beta-type titanium alloy bar. The high-strength metastable beta-type titanium alloy bar produced by the specific heat forging technique and a solid solution and aging treatment system has excellent comprehensive mechanical property; at the room temperature, tensile strength of the high-strength metastable beta-type titanium alloy bar is not less than 1290MPa, yield strength thereof is not less than 1190MPa, elongation percentage thereof is not less than 11%, and section shrinkage rate thereof is not less than 45%.

Description

A kind of high-strength metastable beta-type titanium alloy bar and preparation method thereof

Technical field

The invention belongs to titanium alloy material preparing technical field, be specifically related to a kind of high-strength metastable beta-type titanium alloy bar and preparation method thereof.

Background technology

Titanium alloy, because having higher specific tenacity and good comprehensive mechanical property, has been widely used in the fields such as Aeronautics and Astronautics, boats and ships, oil, chemical industry, Vehicle Engineering and biomedical engineering.High-strength titanium alloy typically refers to after heat treatment room temperature tensile intensity R mbe not less than the titanium alloy of 1100MPa.Beta titanium alloy has excellent cool thermoplastic's processing characteristics and easy forging deformation performance, obtains higher comprehensive mechanical property by solid solution+ageing treatment or thermomechanical treatment process.At present, the high-strength beta titanium alloy obtaining practical application both at home and abroad on aviation aircraft mainly contains Ti-10V-2Fe-3Al (Ti-1023), Ti-5Al-5Mo-5V-1Fe-1Cr (BT22), Ti-15Mo-2.7Nb-3Al-0.2Si (β-21S), Ti-8V-6Cr-4Mo-4Zr-3Al (β-C), Ti-5Al-5Mo-5V-3Cr-0.6Fe (Timetal555), Ti-5Al-5V-5Mo-3Cr-1Zr (VST55531), Ti-3Al-5Mo-5V-8Cr (TB2) etc.Usually, β phase stability factor >=1 of beta titanium alloy, the beta titanium alloy of β phase stability factor between 1.5 ~ 2.5 is called metastable beta-type titanium alloy.After the solid solution of β single phase region, cooling can obtain beta titanium alloy is rapidly all almost the microstructure of metastable β phase, and metastable β, in low temperature aging heat treatment process, phase decomposition occurs, the tiny secondaryαphase (α of disperse educt on β matrix s), the intensity of alloy is increased.The comprehensive mechanical property of metastable beta-type titanium alloy depends primarily on alloying constituent, heat processing technique, heat treating regime and microstructure (comprising grain fineness number, grain boundaries α phase amount of precipitation, the pattern of nascent and secondaryαphase and size etc.).

Ti-5Mo-5V-8Cr-3Al alloy (TB2) is a kind of metastable beta-type titanium alloy, there are some researches show: this alloy has that intensity is high, hardening capacity and the fracture toughness property excellent comprehensive mechanical property such as good.But in use procedure, TB2 alloy, when being used as large section forging structure part, finds that it can forge processing characteristics with unit elongation when having high strength all not as good as high strength alpha and beta type titan alloy.High-alloying causes the low one of the main reasons with forging poor processability of metastable beta-type titanium alloy TB2 large section forging structure part unit elongation.Cr content in TB2 titanium alloy is 8%, compares its Cr content higher, make the β transition point temperature (T of alloy with other beta titanium alloys early stage β) lower, add man-hour in the forging of β phase region, owing to not having α phase in microstructure, and the β crystal grain of fragmentation is repeatedly heated again in forging process, causes crystal grain again to be grown up, and causes microstructure alligatoring, and this will have a strong impact on the unit elongation of alloy.In addition, high-Cr also can make the resistance to deformation of TB2 alloy in forging deformation process increase, and causes forging temperature high, fiery secondary many, extends the hot procedure of whole forging, cause final forge hot to organize thick, reduce the temperature-room type plasticity of alloy.

Summary of the invention

Technical problem to be solved by this invention is for above-mentioned deficiency of the prior art, a kind of high-strength metastable beta-type titanium alloy bar is provided, this high-strength metastable beta-type titanium alloy bar has excellent comprehensive mechanical property: the tensile strength >=1290MPa under room temperature condition, yield strength >=1190MPa, unit elongation >=11%, relative reduction in area >=45%.

For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of high-strength metastable beta-type titanium alloy bar, is characterized in that, be grouped into by the one-tenth of following atomic percent: Al 3%, V 5%, Mo 5%, Cr 4% ~ 6%, surplus is Ti and inevitable impurity; Described high-strength metastable beta-type titanium alloy bar tensile strength >=1290MPa at ambient temperature.

The high-strength metastable beta-type titanium alloy bar of above-mentioned one, is characterized in that, be grouped into by the one-tenth of following atomic percent: Al 3%, V 5%, Mo 5%, Cr 4%, and surplus is Ti and inevitable impurity.

The high-strength metastable beta-type titanium alloy bar of above-mentioned one, is characterized in that, be grouped into by the one-tenth of following atomic percent: Al 3%, V 5%, Mo 5%, Cr 5%, and surplus is Ti and inevitable impurity.

The high-strength metastable beta-type titanium alloy bar of above-mentioned one, is characterized in that, be grouped into by the one-tenth of following atomic percent: Al 3%, V 5%, Mo 5%, Cr 6%, and surplus is Ti and inevitable impurity.

Further, present invention also offers the method for this high-strength metastable beta-type titanium alloy bar of preparation, it is characterized in that, comprise the following steps:

Step one, 0 grade of titanium sponge, molybdenum powder, Al-V master alloy and chromium sheet are mixed by design mix after be pressed into electrode bar, multiple electrode bar is welded into electrode, then described electrode is placed in vacuum arc melting furnace, prepares titan alloy casting ingot through three meltings;

Step 2, titan alloy casting ingot described in step one is placed in 3150T oil press, is carry out cogging forging under the condition of 1100 DEG C ~ 1200 DEG C in temperature, obtains forging stock;

Step 3, forging stock described in step 2 is placed in 1250T high-speed hydranlic press, be carry out pier under the condition of 850 DEG C ~ 950 DEG C to pull out forging in temperature, obtain forging, then described forging is placed in precise forging machine, be carry out radial forging under the condition of 750 DEG C ~ 850 DEG C in temperature, obtain work in-process titanium alloy rod bar;

Step 4, the titanium alloy rod bar of work in-process described in step 3 is incubated 30min ~ 60min under the condition of 750 DEG C ~ 800 DEG C carries out solution treatment, cool to 500 DEG C ~ 600 DEG C insulation 2h ~ 8h again with the furnace and carry out ageing treatment, then air cooling is to room temperature, obtains metastable beta-type titanium alloy bar.

Above-mentioned method, is characterized in that, described in step one, the mean particle size of 0 grade of titanium sponge is not more than 13.0mm, and the mean particle size of described chromium sheet is not more than 2mm.

Above-mentioned method, is characterized in that, the quality purity of molybdenum powder described in step one and chromium sheet is all not less than 99.9%.

Above-mentioned method, is characterized in that, adopts infrared thermometer to monitor forging surface temperature, guarantee that the variation range of radial forging temperature is in-10 DEG C ~ 10 DEG C in the process of radial forging described in step 3.

Above-mentioned method, is characterized in that, the cross section of the titanium alloy rod bar of work in-process described in step 3 is circular, and the diameter of described cross section is 85mm ~ 90mm.

The present invention compared with prior art has the following advantages:

1, the present invention's high-strength metastable beta-type titanium alloy bar has excellent comprehensive mechanical property: the tensile strength >=1290MPa under room temperature condition, yield strength >=1190MPa, unit elongation >=11%, relative reduction in area >=45%.

2, the present invention is by reducing the content of beta stable element Cr in titanium alloy, improve transformation temperature, reduce the high temperature hot deformation resistance of titanium alloy, obtain thinner forging tissue, can improve forging property and the unit elongation of titanium alloy, the titanium alloy rod bar prepared has good intensity and plasticity coupling.

3, the present invention adopts specific hot-work forging process and fixation rates system, β crystal grain in original as cast condition can be forged in cogging, pier pulls out in the hot procedure of forging and radial forging and obtains fragmentation fully, can optimize in radial forging process and adopt infrared thermometer to carry out temperature monitoring to forging surface, guarantee that the variation range of radial forging temperature is in-10 DEG C ~ 10 DEG C, thus it is little to make forging in radial forging process obtain resistance to deformation, easy to control, with after can make in titanium alloy secondaryαphase disperse educt on β matrix after solution treatment and ageing treatment, thus make titanium alloy rod bar also have good plasticity while having high strength, the mechanical property demand of part aerospace structure part can be met.

Below by drawings and Examples, technical scheme of the present invention is described in further detail.

Accompanying drawing explanation

Fig. 1 is the metallographic structure figure of the high-strength metastable beta-type titanium alloy bar of the embodiment of the present invention 1.

Fig. 2 is the SEM photo of the high-strength metastable beta-type titanium alloy bar of the embodiment of the present invention 1.

Fig. 3 is the metallographic structure figure of the high-strength metastable beta-type titanium alloy bar of the embodiment of the present invention 2.

Fig. 4 is the SEM photo of the high-strength metastable beta-type titanium alloy bar of the embodiment of the present invention 2.

Fig. 5 is the metallographic structure figure of the high-strength metastable beta-type titanium alloy bar of the embodiment of the present invention 3.

Fig. 6 is the SEM photo of the high-strength metastable beta-type titanium alloy bar of the embodiment of the present invention 3.

Fig. 7 is the metallographic structure figure of the high-strength metastable beta-type titanium alloy bar of the embodiment of the present invention 4.

Fig. 8 is the SEM photo of the high-strength metastable beta-type titanium alloy bar of the embodiment of the present invention 4.

Embodiment

The manufacturer of the 1250T high-speed hydranlic press used in the embodiment of the present invention 1 ~ embodiment 6 is Jiangsu work of nature international corporation.

Embodiment 1

The present embodiment high-strength metastable beta-type titanium alloy bar is grouped into by the one-tenth of following atomic percent: Al 3%, V 5%, Mo 5%, Cr 4%, and surplus is Ti and inevitable impurity; Described high-strength metastable beta-type titanium alloy bar tensile strength >=1290MPa at ambient temperature.

The preparation method of the high-strength metastable beta-type titanium alloy bar of the present embodiment comprises the following steps:

Step one, 0 grade of titanium sponge, molybdenum powder, Al-V master alloy and chromium sheet are mixed by design mix after be pressed into electrode bar, 4 electrode bars are welded into electrode, then described electrode is placed in vacuum arc melting furnace, prepares titan alloy casting ingot through three meltings; The mean particle size of described 0 grade of titanium sponge is not more than 13.0mm, and the mean particle size of described chromium sheet is not more than 2mm, and the quality purity of described molybdenum powder and chromium sheet is all not less than 99.9%;

Step 2, titan alloy casting ingot described in step one is placed in 3150T oil press, is carry out cogging forging under the condition of 1200 DEG C in temperature, obtains forging stock; The cross section of described forging stock is square, and described cross section is of a size of 210mm × 210mm;

Step 3, forging stock described in step 2 is placed in 1250T high-speed hydranlic press, be carry out pier under the condition of 950 DEG C to pull out forging in temperature, obtain forging, then described forging is placed in precise forging machine, be carry out radial forging under the condition of 850 DEG C in temperature, obtain work in-process titanium alloy rod bar; Adopt infrared thermometer to monitor forging surface temperature in the process of described radial forging, guarantee that the variation range of radial forging temperature is in-10 DEG C ~ 10 DEG C; The cross section of described work in-process titanium alloy rod bar is circular, and the diameter of described cross section is 90mm;

Step 4, the titanium alloy rod bar of work in-process described in step 3 is incubated 30min under the condition of 800 DEG C carries out solution treatment, then cool to 600 DEG C of insulation 2h with the furnace and carry out ageing treatment, then air cooling is to room temperature, obtains high-strength metastable beta-type titanium alloy bar.

Test the mechanical property of the high-strength metastable beta-type titanium alloy bar of the present embodiment under room temperature condition, result is tensile strength is 1340MPa, and yield strength is 1220MPa, and unit elongation is 11%, and relative reduction in area is 45%.

As can be seen from Fig. 1 and Fig. 2, on original β matrix, the needle-like secondaryαphase of a large amount of Dispersed precipitate is separated out in the microstructure of high-strength metastable beta-type titanium alloy bar prepared by the present embodiment, and the length of secondaryαphase is about 2 μm ~ 3 μm, evenly separates out tiny diffuse type secondaryαphase in β crystal grain and can ensure that this titanium alloy rod bar has high intensity and good plasticity coupling.

Embodiment 2

The present embodiment high-strength metastable beta-type titanium alloy bar is grouped into by the one-tenth of following atomic percent: Al 3%, V 5%, Mo 5%, Cr 5%, and surplus is Ti and inevitable impurity; Described high-strength metastable beta-type titanium alloy bar tensile strength >=1290MPa at ambient temperature.

The preparation method of the high-strength metastable beta-type titanium alloy bar of the present embodiment comprises the following steps:

Step one, 0 grade of titanium sponge, molybdenum powder, Al-V master alloy and chromium sheet are mixed by design mix after be pressed into electrode bar, 3 electrode bars are welded into electrode, then described electrode is placed in vacuum arc melting furnace, prepares titan alloy casting ingot through three meltings; The mean particle size of described 0 grade of titanium sponge is not more than 13.0mm, and the mean particle size of described chromium sheet is not more than 2mm, and the quality purity of described molybdenum powder and chromium sheet is all not less than 99.9%;

Step 2, titan alloy casting ingot described in step one is placed in 3150T oil press, is carry out cogging forging under the condition of 1150 DEG C in temperature, obtains forging stock; The cross section of described forging stock is square, and described cross section is of a size of 210mm × 210mm;

Step 3, forging stock described in step 2 is placed in 1250T high-speed hydranlic press, be carry out pier under the condition of 900 DEG C to pull out forging in temperature, obtain forging, then described forging is placed in precise forging machine, be carry out radial forging under the condition of 800 DEG C in temperature, obtain work in-process titanium alloy rod bar; Adopt infrared thermometer to monitor forging surface temperature in the process of described radial forging, guarantee that the variation range of radial forging temperature is in-10 DEG C ~ 10 DEG C; The cross section of described work in-process titanium alloy rod bar is circular, and the diameter of described cross section is 90mm;

Step 4, the titanium alloy rod bar of work in-process described in step 3 is incubated 60min under the condition of 750 DEG C carries out solution treatment, then cool to 550 DEG C of insulation 4h with the furnace and carry out ageing treatment, then air cooling is to room temperature, obtains high-strength metastable beta-type titanium alloy bar.

Test the mechanical property of the high-strength metastable beta-type titanium alloy bar of the present embodiment under room temperature condition, result is tensile strength is 1290MPa, and yield strength is 1190MPa, and unit elongation is 12.5%, and relative reduction in area is 48%.

As can be seen from Fig. 3 and Fig. 4, on original β matrix, the needle-like secondaryαphase of a large amount of Dispersed precipitate is separated out in the microstructure of high-strength metastable beta-type titanium alloy bar prepared by the present embodiment, and the length of secondaryαphase is about 3 μm ~ 5 μm, evenly separates out tiny diffuse type secondaryαphase in β crystal grain and can ensure that this titanium alloy rod bar has high intensity and good plasticity coupling.

Embodiment 3

The present embodiment high-strength metastable beta-type titanium alloy bar is grouped into by the one-tenth of following atomic percent: Al 3%, V 5%, Mo 5%, Cr 6%, and surplus is Ti and inevitable impurity; Described high-strength metastable beta-type titanium alloy bar tensile strength >=1290MPa at ambient temperature.

The preparation method of the high-strength metastable beta-type titanium alloy bar of the present embodiment comprises the following steps:

Step one, 0 grade of titanium sponge, molybdenum powder, Al-V master alloy and chromium sheet are mixed by design mix after be pressed into electrode bar, 3 electrode bars are welded into electrode, then described electrode is placed in vacuum arc melting furnace, prepares titan alloy casting ingot through three meltings; The mean particle size of described 0 grade of titanium sponge is not more than 13.0mm, and the mean particle size of described chromium sheet is not more than 2mm, and the quality purity of described molybdenum powder and chromium sheet is all not less than 99.9%;

Step 2, titan alloy casting ingot described in step one is placed in 3150T oil press, is carry out cogging forging under the condition of 1100 DEG C in temperature, obtains forging stock; The cross section of described forging stock is square, and described cross section is of a size of 210mm × 210mm;

Step 3, forging stock described in step 2 is placed in 1250T high-speed hydranlic press, be carry out pier under the condition of 850 DEG C to pull out forging in temperature, obtain forging, then described forging is placed in precise forging machine, be carry out radial forging under the condition of 750 DEG C in temperature, obtain work in-process titanium alloy rod bar; Adopt infrared thermometer to monitor forging surface temperature in the process of described radial forging, guarantee that the variation range of radial forging temperature is in-10 DEG C ~ 10 DEG C; The cross section of described work in-process titanium alloy rod bar is circular, and the diameter of described cross section is 90mm;

Step 4, the titanium alloy rod bar of work in-process described in step 3 is incubated 30min under the condition of 750 DEG C carries out solution treatment, then cool to 500 DEG C of insulation 8h with the furnace and carry out ageing treatment, then air cooling is to room temperature, obtains high-strength metastable beta-type titanium alloy bar.

Test the mechanical property of the high-strength metastable beta-type titanium alloy bar of the present embodiment under room temperature condition, result is tensile strength is 1300MPa, and yield strength is 1210MPa, and unit elongation is 12.1%, and relative reduction in area is 46%.

As can be known from Fig. 5 and Fig. 6, on original β matrix, the needle-like secondaryαphase of a large amount of Dispersed precipitate is separated out in the microstructure of high-strength metastable beta-type titanium alloy bar prepared by the present embodiment, and the length of secondaryαphase is about 3 μm ~ 6 μm, evenly separates out tiny diffuse type secondaryαphase in β crystal grain and can ensure that this titanium alloy rod bar has high intensity and good plasticity coupling.

Embodiment 4

The present embodiment high-strength metastable beta-type titanium alloy bar is grouped into by the one-tenth of following atomic percent: Al 3%, V 5%, Mo 5%, Cr 6%, and surplus is Ti and inevitable impurity; Described high-strength metastable beta-type titanium alloy bar tensile strength >=1290MPa at ambient temperature.

The preparation method of the high-strength metastable beta-type titanium alloy bar of the present embodiment comprises the following steps:

Step one, 0 grade of titanium sponge, molybdenum powder, Al-V master alloy and chromium sheet are mixed by design mix after be pressed into electrode bar, 4 electrode bars are welded into electrode, then described electrode is placed in vacuum arc melting furnace, prepares titan alloy casting ingot through three meltings; The mean particle size of described 0 grade of titanium sponge is not more than 13.0mm, and the mean particle size of described chromium sheet is not more than 2mm, and the quality purity of described molybdenum powder and chromium sheet is all not less than 99.9%;

Step 2, titan alloy casting ingot described in step one is placed in 3150T oil press, is carry out cogging forging under the condition of 1100 DEG C in temperature, obtains forging stock; The cross section of described forging stock is square, and described cross section is of a size of 210mm × 210mm;

Step 3, forging stock described in step 2 is placed in 1250T high-speed hydranlic press, be carry out pier under the condition of 850 DEG C to pull out forging in temperature, obtain forging, then described forging is placed in precise forging machine, be carry out radial forging under the condition of 750 DEG C in temperature, obtain work in-process titanium alloy rod bar; Adopt infrared thermometer to monitor forging surface temperature in the process of described radial forging, guarantee that the variation range of radial forging temperature is in-10 DEG C ~ 10 DEG C; The cross section of described work in-process titanium alloy rod bar is circular, and the diameter of described cross section is 90mm;

Step 4, the titanium alloy rod bar of work in-process described in step 3 is incubated 30min under the condition of 750 DEG C carries out solution treatment, then cool to 500 DEG C of insulation 6h with the furnace and carry out ageing treatment, then air cooling is to room temperature, obtains high-strength metastable beta-type titanium alloy bar.

Test the mechanical property of the high-strength metastable beta-type titanium alloy bar of the present embodiment under room temperature condition, result is tensile strength is 1295MPa, and yield strength is 1208MPa, and unit elongation is 12.3%, and relative reduction in area is 48%.

As can be seen from Fig. 7 and Fig. 8, on original β matrix, the needle-like secondaryαphase of a large amount of Dispersed precipitate is separated out in the microstructure of high-strength metastable beta-type titanium alloy bar prepared by the present embodiment, and the length of secondaryαphase is about 2 μm ~ 4 μm, evenly separates out tiny diffuse type secondaryαphase in β crystal grain and can ensure that this titanium alloy rod bar has high intensity and good plasticity coupling.

Embodiment 5

The present embodiment high-strength metastable beta-type titanium alloy bar is grouped into by the one-tenth of following atomic percent: Al 3%, V 5%, Mo 5%, Cr 4.5%, and surplus is Ti and inevitable impurity; Described high-strength metastable beta-type titanium alloy bar tensile strength >=1290MPa at ambient temperature.

The preparation method of the high-strength metastable beta-type titanium alloy bar of the present embodiment comprises the following steps:

Step one, 0 grade of titanium sponge, molybdenum powder, Al-V master alloy and chromium sheet are mixed by design mix after be pressed into electrode bar, 3 electrode bars are welded into electrode, then described electrode is placed in vacuum arc melting furnace, prepares titan alloy casting ingot through three meltings; The mean particle size of described 0 grade of titanium sponge is not more than 13.0mm, and the mean particle size of described chromium sheet is not more than 2mm, and the quality purity of described molybdenum powder and chromium sheet is all not less than 99.9%;

Step 2, titan alloy casting ingot described in step one is placed in 3150T oil press, is carry out cogging forging under the condition of 1120 DEG C in temperature, obtains forging stock; The cross section of described forging stock is square, and described cross section is of a size of 200mm × 200mm;

Step 3, forging stock described in step 2 is placed in 1250T high-speed hydranlic press, be carry out pier under the condition of 900 DEG C to pull out forging in temperature, obtain forging, then described forging is placed in precise forging machine, be carry out radial forging under the condition of 850 DEG C in temperature, obtain work in-process titanium alloy rod bar; Adopt infrared thermometer to monitor forging surface temperature in the process of described radial forging, guarantee that the variation range of radial forging temperature is in-10 DEG C ~ 10 DEG C; The cross section of described work in-process titanium alloy rod bar is circular, and the diameter of described cross section is 85mm;

Step 4, the titanium alloy rod bar of work in-process described in step 3 is incubated 45min under the condition of 780 DEG C carries out solution treatment, then cool to 540 DEG C of insulation 5h with the furnace and carry out ageing treatment, then air cooling is to room temperature, obtains high-strength metastable beta-type titanium alloy bar.

Test the mechanical property of the high-strength metastable beta-type titanium alloy bar of the present embodiment under room temperature condition, result is tensile strength is 1293MPa, and yield strength is 1195MPa, and unit elongation is 12.2%, and relative reduction in area is 47%.

Embodiment 6

The present embodiment high-strength metastable beta-type titanium alloy bar is grouped into by the one-tenth of following atomic percent: Al 3%, V 5%, Mo 5%, Cr 5.5%, and surplus is Ti and inevitable impurity; Described high-strength metastable beta-type titanium alloy bar tensile strength >=1290MPa at ambient temperature.

The preparation method of the high-strength metastable beta-type titanium alloy bar of the present embodiment comprises the following steps:

Step one, 0 grade of titanium sponge, molybdenum powder, Al-V master alloy and chromium sheet are mixed by design mix after be pressed into electrode bar, 4 electrode bars are welded into electrode, then described electrode is placed in vacuum arc melting furnace, prepares titan alloy casting ingot through three meltings; The mean particle size of described 0 grade of titanium sponge is not more than 13.0mm, and the mean particle size of described chromium sheet is not more than 2mm, and the quality purity of described molybdenum powder and chromium sheet is all not less than 99.9%;

Step 2, titan alloy casting ingot described in step one is placed in 3150T oil press, is carry out cogging forging under the condition of 1150 DEG C in temperature, obtains forging stock; The cross section of described forging stock is square, and described cross section is of a size of 205mm × 205mm;

Step 3, forging stock described in step 2 is placed in 1250T high-speed hydranlic press, be carry out pier under the condition of 920 DEG C to pull out forging in temperature, obtain forging, then described forging is placed in precise forging machine, be carry out radial forging under the condition of 830 DEG C in temperature, obtain work in-process titanium alloy rod bar; Adopt infrared thermometer to monitor forging surface temperature in the process of described radial forging, guarantee that the variation range of radial forging temperature is in-10 DEG C ~ 10 DEG C; The cross section of described work in-process titanium alloy rod bar is circular, and the diameter of described cross section is 85mm;

Step 4, the titanium alloy rod bar of work in-process described in step 3 is incubated 40min under the condition of 760 DEG C carries out solution treatment, then cool to 550 DEG C of insulation 4h with the furnace and carry out ageing treatment, then air cooling is to room temperature, obtains high-strength metastable beta-type titanium alloy bar.

Test the mechanical property of the high-strength metastable beta-type titanium alloy bar of the present embodiment under room temperature condition, result is tensile strength is 1291MPa, and yield strength is 1194MPa, and unit elongation is 12.0%, and relative reduction in area is 45%.

The above; it is only preferred embodiment of the present invention; not the present invention is imposed any restrictions, every above embodiment is done according to the technology of the present invention essence any simple modification, change and equivalent structure change, all still belong in the protection domain of technical solution of the present invention.

Claims (9)

1. a high-strength metastable beta-type titanium alloy bar, is characterized in that, is grouped into by the one-tenth of following atomic percent: Al 3%, V 5%, Mo 5%, Cr 4% ~ 6%, and surplus is Ti and inevitable impurity; Described high-strength metastable beta-type titanium alloy bar tensile strength >=1290MPa at ambient temperature.
2. according to the high-strength metastable beta-type titanium alloy bar of one according to claim 1, it is characterized in that, be grouped into by the one-tenth of following atomic percent: Al 3%, V 5%, Mo 5%, Cr 4%, surplus is Ti and inevitable impurity.
3. according to the high-strength metastable beta-type titanium alloy bar of one according to claim 1, it is characterized in that, be grouped into by the one-tenth of following atomic percent: Al 3%, V 5%, Mo 5%, Cr 5%, surplus is Ti and inevitable impurity.
4. according to the high-strength metastable beta-type titanium alloy bar of one according to claim 1, it is characterized in that, be grouped into by the one-tenth of following atomic percent: Al 3%, V 5%, Mo 5%, Cr 6%, surplus is Ti and inevitable impurity.
5. the method for preparation high-strength metastable beta-type titanium alloy bar as described in claim arbitrary in Claims 1 to 4, is characterized in that, comprise the following steps:
Step one, 0 grade of titanium sponge, molybdenum powder, Al-V master alloy and chromium sheet are mixed by design mix after be pressed into electrode bar, multiple electrode bar is welded into electrode, then described electrode is placed in vacuum arc melting furnace, prepares titan alloy casting ingot through three meltings;
Step 2, titan alloy casting ingot described in step one is placed in 3150T oil press, is carry out cogging forging under the condition of 1100 DEG C ~ 1200 DEG C in temperature, obtains forging stock;
Step 3, forging stock described in step 2 is placed in 1250T high-speed hydranlic press, be carry out pier under the condition of 850 DEG C ~ 950 DEG C to pull out forging in temperature, obtain forging, then described forging is placed in precise forging machine, be carry out radial forging under the condition of 750 DEG C ~ 850 DEG C in temperature, obtain work in-process titanium alloy rod bar;
Step 4, the titanium alloy rod bar of work in-process described in step 3 is incubated 30min ~ 60min under the condition of 750 DEG C ~ 800 DEG C carries out solution treatment, cool to 500 DEG C ~ 600 DEG C insulation 2h ~ 8h again with the furnace and carry out ageing treatment, then air cooling is to room temperature, obtains metastable beta-type titanium alloy bar.
6. in accordance with the method for claim 5, it is characterized in that, described in step one, the mean particle size of 0 grade of titanium sponge is not more than 13.0mm, and the mean particle size of described chromium sheet is not more than 2mm.
7. in accordance with the method for claim 5, it is characterized in that, the quality purity of molybdenum powder described in step one and chromium sheet is all not less than 99.9%.
8. in accordance with the method for claim 5, it is characterized in that, adopt infrared thermometer to monitor forging surface temperature in the process of radial forging described in step 3, guarantee that the variation range of radial forging temperature is in-10 DEG C ~ 10 DEG C.
9. in accordance with the method for claim 5, it is characterized in that, the cross section of the titanium alloy rod bar of work in-process described in step 3 is circular, and the diameter of described cross section is 85mm ~ 90mm.
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CN110252918A (en) * 2019-07-25 2019-09-20 西北有色金属研究院 3D printing powder Ti2The preparation method of AlNb based alloy bar

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