CN105648375B - A kind of superplastic method of raising metastable state beta-titanium alloy - Google Patents

A kind of superplastic method of raising metastable state beta-titanium alloy Download PDF

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Publication number
CN105648375B
CN105648375B CN201610213876.3A CN201610213876A CN105648375B CN 105648375 B CN105648375 B CN 105648375B CN 201610213876 A CN201610213876 A CN 201610213876A CN 105648375 B CN105648375 B CN 105648375B
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titanium
alloy
metastable
aging treatment
temperature
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CN201610213876.3A
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CN105648375A (en
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董洪波
邹忠波
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江西景航航空锻铸有限公司
南昌航空大学
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
    • C22F1/18High-melting or refractory metals or alloys based thereon
    • C22F1/183High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C14/00Alloys based on titanium

Abstract

A kind of superplastic method of raising metastable state beta-titanium alloy carries out Pre-aging treatment to the metastable β Titanium-alloy.Method provided by the invention, by the Pre-aging treatments for carrying out 20min~70min for 440 DEG C~545 DEG C in temperature to metastable β Titanium-alloy, a certain amount of α phase is precipitated in metastable β Titanium-alloy, α phase is precipitated to be precipitated in β grain boundaries first, the hardness of α phase is high compared with β phase hardness, in superplastic deformation, α with high hardness generates strain with respect to matrix β phase and concentrates, β phase crystal grain has been refined to a certain extent, and crystal grain is more tiny, superplasticity is better, and then increases the superplasticity of metastable β Titanium-alloy.The elongation percentage that the embodiment of the present invention obtains after handling metastable β Titanium-alloy is up to 361.8%, and the elongation percentage compared to the metastable β Titanium-alloy being not handled by is 194.0%, and elongation percentage improves 167.8%.

Description

A kind of superplastic method of raising metastable state beta-titanium alloy

Technical field

The present invention relates to titanium alloy technical field more particularly to a kind of superplastic methods of raising metastable state beta-titanium alloy.

Background technique

The superplasticity of metal refer to material in grain shape, crystallite dimension and the certain interior condition of phase composition structure and At temperature and the certain external condition of strain rate, abnormal low rheology drag and abnormal high rheological property are showed, such as It is several hundred that elongation percentage is up to percent.

Superplastic forming technique using more and more extensive, titanium alloy superplasticity is mainly had using titanium alloy itself Plastic properties on the basis of carry out molding research, the application of the superplastic forming of titanium alloy mainly has: Superplastic Isothermal Forging, Gas pressure compacting, superplastic extrusion, vacuum forming etc..

Metastable β Titanium-alloy improves intensity by dispersion-strengtherning, also has excellent cold/hot shaped, deep harden ability and good The characteristics such as good corrosion resistance, creep-resistant property and inoxidizability, be widely used in production have temperature requirement aircraft structure or Engine structure, honeycomb, fastener and hydraulic tubing etc..But the superplasticity of metastable β Titanium-alloy is lower, limits metastable β Titanium alloy is more widely applied in superplastic forming process aspect.

Summary of the invention

In view of this, the purpose of the present invention is to provide a kind of superplastic method of raising metastable β Titanium-alloy, the present invention is mentioned The processing method of confession can significantly improve the superplasticity of metastable β Titanium-alloy.

In order to achieve the above-mentioned object of the invention, the present invention the following technical schemes are provided:

A kind of superplastic method of raising metastable β Titanium-alloy carries out Pre-aging treatment to the metastable β Titanium-alloy;It is described The temperature of Pre-aging treatment is 440 DEG C~545 DEG C, and the time of the Pre-aging treatment is 20min~70min.

Preferably, the temperature of the Pre-aging treatment is 520 DEG C, and the time of the Pre-aging treatment is 40min.

Preferably, the time of the temperature of the Pre-aging treatment and the Pre-aging treatment determines according to the following steps:

Obtain the pre-age temperature range and preageing soaking time range of metastable β Titanium-alloy;

Preageing is carried out to the metastable β Titanium-alloy within the scope of the pre-age temperature range and preageing soaking time Processing;

Erichsen test test is carried out to metastable β Titanium-alloy after the Pre-aging treatment;

According to the tensile property test as a result, obtain to metastable β Titanium-alloy carry out Pre-aging treatment temperature and when Between.

Preferably, the pre-age temperature range of the metastable β Titanium-alloy is 400 DEG C~600 DEG C.

Preferably, 5 pre-age temperature values, specially the first preageing are chosen by gradient within the scope of the pre-age temperature Temperature value, the second pre-age temperature value, third pre-age temperature value, the 4th pre-age temperature value and the 5th pre-age temperature value; The difference of two adjacent pre-age temperatures is preferably independently 20~50 DEG C in 5 pre-age temperature values.

Preferably, the preageing soaking time range of the metastable β Titanium-alloy is 20min~70min.

Preferably, 5 pre-age temperature values, specially the first preageing are chosen by gradient within the scope of the pre-age temperature Temperature value, the second pre-age temperature value, third pre-age temperature value, the 4th pre-age temperature value and the 5th pre-age temperature value; The difference of two adjacent pre-age temperatures is preferably independently 20~50 DEG C in 5 pre-age temperature values.

Preferably, the chemical constitution formula of the metastable β Titanium-alloy are as follows: Ti-15Mo-3Al-2.7Nb-0.2Si.

The present invention provides a kind of superplastic methods of raising metastable β Titanium-alloy, when carrying out pre- to the metastable β Titanium-alloy Effect processing, the temperature of the Pre-aging treatment are 440 DEG C~545 DEG C, and the time of the Pre-aging treatment is 20min~70min. Method provided by the invention, by carrying out Pre-aging treatment to metastable β Titanium-alloy, a certain amount of α phase is precipitated in metastable β Titanium-alloy, α phase is precipitated to be precipitated in β grain boundaries first, the hardness of α phase is high compared with β phase hardness, and in superplastic deformation, α with high hardness is with respect to base Body β phase generates strain and concentrates, and has refined β phase crystal grain to a certain extent, and crystal grain is more tiny, superplasticity is better, and then increases metastable β The superplasticity of titanium alloy.The elongation percentage that the embodiment of the present invention obtains after handling metastable β Titanium-alloy is up to 361.8%, phase Elongation percentage than the metastable β Titanium-alloy being not handled by is 194.0%, and elongation percentage improves 167.8%.

Detailed description of the invention

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Fig. 1 is tensile property test sample structure chart in the embodiment of the present invention;

Fig. 2 is in the embodiment of the present invention without tensile property test sample;

Fig. 3 is in comparative example of the present invention without the sample after the tensile property test of Pre-aging treatment;

Fig. 4 is the sample in the embodiment of the present invention 1 after the Pre-aging treatment tensile property test of 520 DEG C of heat preservation 20min;

Fig. 5 is the sample in the embodiment of the present invention 2 after the Pre-aging treatment tensile property test of 520 DEG C of heat preservation 40min;

Fig. 6 is the sample in the embodiment of the present invention 2 after the Pre-aging treatment tensile property test of 520 DEG C of heat preservation 70min;

Fig. 7 is the sample in the embodiment of the present invention 3 after the Pre-aging treatment tensile property test of 440 DEG C of heat preservation 40min;

Fig. 8 is the sample in the embodiment of the present invention 3 after the Pre-aging treatment tensile property test of 480 DEG C of heat preservation 40min;

Fig. 9 is the sample in the embodiment of the present invention 3 after the Pre-aging treatment tensile property test of 545 DEG C of heat preservation 40min;

Figure 10 is metastable β Titanium-alloy elongation percentage in the embodiment of the present invention with the changing rule of different pre-age temperature ranges;

Figure 11 is metastable β Titanium-alloy elongation percentage in the embodiment of the present invention with the changing rule of different preageing time ranges.

Specific embodiment

The present invention provides a kind of superplastic methods of raising metastable β Titanium-alloy, when carrying out pre- to the metastable β Titanium-alloy Effect processing, the temperature of the Pre-aging treatment are 440 DEG C~545 DEG C, and the time of the Pre-aging treatment is 20min~70min.

Method provided by the invention, in 440 DEG C before being deformed~545 DEG C temperature ranges, by being carried out to metastable β Titanium-alloy A certain amount of α phase is precipitated in 20min~70min Pre-aging treatment, metastable β Titanium-alloy, and the hardness of α phase is high compared with β phase hardness, carries out 20 The Pre-aging treatment of~70min time is precipitated α phase and is precipitated first in β grain boundaries, and avoids growing up for α phase, it is ensured that β phase It is stabilized.In superplastic deformation, deformation is concentrated mainly in β phase matrix, and the α phase of high rigidity hinders to deform and generates stress It concentrates, improves dislocation density, promote dynamic recrystallization, refine β phase crystal grain.In addition, tiny α phase is also to β phase crystal grain It has grown up inhibiting effect, crystal grain is more tiny, superplasticity is better, therefore, passes through metastable β Titanium-alloy after short time Pre-aging treatment More preferably superplasticity can be obtained.

The present invention carries out the temperature and time of Pre-aging treatment to metastable β Titanium-alloy in order to obtain, and the present invention preferably first obtains Take the pre-age temperature range and preageing soaking time range of metastable β Titanium-alloy.In the present invention, the metastable β Titanium-alloy Chemical constitution formula is preferred are as follows: Ti-15Mo-3Al-2.7Nb-0.2Si is rolled into bar after vacuum melting, draws as superplasticity Stretch the raw material of sample.There is no particular/special requirement to the source of the metastable β Titanium-alloy, using Asia well known to those skilled in the art Steady beta-titanium alloy forging.Titanium alloy after 500-560 DEG C of temperature 8-10h fixation rates can obtain higher Intensity, the present invention by 520 DEG C as the pre-age temperature initially explored before tension test, through shorter preageing soaking time with It is target that a certain amount of tiny α phase, which is precipitated, in even dispersion, is the preageing soaking time initially explored with 20min.In the present invention In, the pre-age temperature ranges preferably from 400 DEG C~600 DEG C, and preageing soaking time ranges preferably from 20min~70min.

After the pre-age temperature range and preageing time range that obtain metastable β Titanium-alloy, the present invention is in the preageing Pre-aging treatment is carried out to the metastable β Titanium-alloy in temperature range and preageing time range.In order to preferably filter out effect Fruit preferably temperature and time, the present invention preferably take different pre-age temperature values, in preageing within the scope of pre-age temperature Different preageing soaking time values is taken within the scope of soaking time.The present invention presses gradient preferably within the scope of the pre-age temperature Choose 5 pre-age temperature values, specially the first pre-age temperature value, the second pre-age temperature value, third pre-age temperature value, 4th pre-age temperature value and the 5th pre-age temperature value;Two adjacent pre-age temperatures in 5 pre-age temperature values Difference be preferably independently 20~50 DEG C, more preferably 25~45 DEG C, most preferably 30~40 DEG C.In the embodiment of the present invention In, the pre-age temperature value can be specially 400 DEG C, 440 DEG C, 480 DEG C, 520 DEG C and 545 DEG C.

4 terraced preageing time values are arranged by gradient preferably in the preageing time range in the present invention, and specially the One preageing soaking time value, the second preageing soaking time value, third preageing soaking time value and the heat preservation of the 4th preageing Time value;The worth difference of two adjacent preageing soaking times is preferably independently in 4 preageings soaking time value 10~20min, more preferably 15~18min;In an embodiment of the present invention, the preageing soaking time value can be specially 20min, 40min, 50min and 70min.

After gradient temperature value and gradient timetable value is arranged, the present invention is respectively in different pre-age temperature value and different pre- Timeliness soaking time value carries out Pre-aging treatment to metastable β Titanium-alloy.In the embodiment of the present invention, using a certain preageing temperature of determination Angle value carries out Pre-aging treatment to the metastable β Titanium-alloy, obtains the higher institute of elongation percentage under the conditions of different soaking time values After corresponding soaking time value, using corresponding soaking time value, under the conditions of different pre-age temperature values, to described metastable Beta-titanium alloy carries out Pre-aging treatment.

The preageing under the conditions of different pre-age temperature values and preageing soaking time value is completed to the metastable β Titanium-alloy After processing, the present invention preferably carries out cooling treatment to metastable β Titanium-alloy, and the present invention does not have particular/special requirement to the type of cooling, uses The type of cooling well-known to those skilled in the art, using air cooled mode to metastable β titanium in the embodiment of the present invention Alloy carries out cooling treatment.

After carrying out Pre-aging treatment to the metastable β Titanium-alloy, the present invention closes the metastable β titanium after the Pre-aging treatment Gold carries out Erichsen test test, and tensile property test of the present invention is according to national standard GB/T228.1-2010 " material during tensile Test part 1: room temperature test method " it carries out.The present invention is carrying out tensile property to the metastable β Titanium-alloy after Pre-aging treatment When test, it is preferred to use the test sample of dumbbell structure, as shown in Figure 1, the test sample is dumbbell shaped, including clamping end And clamping end is arranged in deformed area, the both ends of the deformed area, the clamping end is symmetrical about deformed area, the clamping end and deformation It is connected between area by transition arc;In the present invention, the diameter of the clamping end be 12mm, deformed area diameter be 5 ± 0.05mm, clamping end and deformed area transition arc are the chamfering that radius is 2.5mm, and the overall length of the test sample is 44mm, right The clamping end of title long 12mm respectively.

In the present invention, the deformation temperature in the tensile property test process is preferably 840 DEG C, and rate of deformation is preferably 0.001s-1;Before the deformation temperature for determining tensile property test in the present invention, preferably with 0.001s-1As strain rate condition Under, it is different temperatures value in 500 DEG C~1000 DEG C as deformation temperature using temperature range, draftability is carried out to metastable β Titanium-alloy It can test, when deformation temperature is 840 DEG C, the elongation percentage of metastable β Titanium-alloy is maximum, determines that the deformation temperature of tensile property test is 840℃.In the embodiment of the present invention, tensile property test is carried out to sample using SANS-CMT4104 electronic tensile test machine.This Inventive embodiments use XY-1200 high temperature box type resistance furnace to the Pre-aging treatment of metastable β Titanium-alloy.

After completing the tensile property test, the present invention obtains different pre-age temperature values and different preageing heat preservations The tensile property of metastable β Titanium-alloy under time value is as a result, according to tensile property test as a result, obtaining to described metastable The temperature and time of beta-titanium alloy progress Pre-aging treatment.

The present invention provides a kind of superplastic methods of raising metastable β Titanium-alloy, when carrying out pre- to the metastable β Titanium-alloy Effect processing.Method provided by the invention, by carrying out Pre-aging treatment to metastable β Titanium-alloy, metastable β Titanium-alloy is precipitated a certain amount of α phase, α phase is precipitated and is precipitated first in β grain boundaries, the hardness of α phase is compared with β phase hardness height, in superplastic deformation, α with high hardness Opposite matrix β phase generates strain and concentrates, and has refined β phase crystal grain to a certain extent, crystal grain is more tiny, superplasticity is better, Jin Erzeng Add the superplasticity of metastable β Titanium-alloy.The elongation percentage that the embodiment of the present invention obtains after handling metastable β Titanium-alloy is up to 361.8%, the elongation percentage compared to the metastable β Titanium-alloy being not handled by is 194.0%, and elongation percentage improves 167.8%.

The superplastic method of raising metastable β Titanium-alloy provided by the invention is carried out specifically below with reference to embodiment It is bright, but they cannot be interpreted as limiting the scope of the present invention.

Comparative example 1

Untreated metastable β Titanium-alloy Ti-15Mo-3Al-2.7Nb-0.2Si is added according to sample shown in FIG. 1 Work, then with 840 DEG C and 0.001s on SANS-CMT4104 electronic tensile test machine-1Strain rate under the conditions of, drawn Performance test is stretched, sample of having no progeny is as shown in figure 3, gained elongation percentage is 194%.

Embodiment 1

Metastable β Titanium-alloy Ti-15Mo-3Al-2.7Nb-0.2Si is placed in XY-1200 high temperature box type resistance furnace and is carried out in advance Ageing treatment, the temperature value in resistance furnace are limited to 520 DEG C, and metastable β Titanium-alloy takes out after resistance furnace inside holding 20min in sky Natural cooling in gas processes metastable β Titanium-alloy after cooling according to sample shown in FIG. 1, then in SANS- With 840 DEG C and 0.001s on CMT4104 electronic tensile test machine-1Strain rate under the conditions of, carry out tensile property test, have no progeny Sample is as shown in figure 4, gained elongation percentage is 287%.

Embodiment 2

On the basis of 1 Pre-aging treatment parameter of embodiment, 520 DEG C of pre-age temperature of holding is constant, when changing preageing Between, the preageing time is respectively 40min and 70min, and metastable β Titanium-alloy Ti-15Mo-3Al-2.7Nb-0.2Si is placed in XY- Pre-aging treatment is carried out in 1200 high temperature box type resistance furnaces, it is rear to take out natural cooling in air, metastable β titanium after cooling is closed Gold is processed according to sample shown in FIG. 1, then on SANS-CMT4104 electronic tensile test machine with 840 DEG C and 0.001s-1Strain rate under the conditions of, carry out tensile property test, through pre-age temperature be 520 DEG C, preageing soaking time For the sample of having no progeny of the Pre-aging treatment of 40min as shown in figure 5, gained elongation percentage is 361.8%, Pre-aging treatment is 520 DEG C of guarantors The sample of having no progeny of warm 70min is as shown in fig. 6, gained elongation percentage is 303%.Comparing pre-age temperature is 520 DEG C, through different time Elongation percentage obtained by sample tensile test after isothermal holding, the elongation percentage obtained after 520 DEG C of Pre-aging treatments heat preservation 40min compared with Greatly.

Embodiment 3

On the basis of 3 Pre-aging treatment parameter of embodiment, keep preageing soaking time 40min constant, when changing pre- Temperature is imitated, pre-age temperature is respectively 440 DEG C, 480 DEG C and 545 DEG C, by metastable β Titanium-alloy Ti-15Mo-3Al-2.7Nb- 0.2Si, which is placed in XY-1200 high temperature box type resistance furnace, carries out Pre-aging treatment, rear to take out natural cooling in air, will cool down Metastable β Titanium-alloy afterwards is processed according to sample shown in FIG. 1, then on SANS-CMT4104 electronic tensile test machine with 840 DEG C and 0.001s-1Strain rate under the conditions of, carry out tensile property test, through pre-age temperature be 440 DEG C, preageing protect The Pre-aging treatment of warm time 40min has no progeny sample as shown with 7, and gained elongation percentage is 174%, and Pre-aging treatment is 480 DEG C For the sample of having no progeny of heat preservation 40min as shown in figure 8, gained elongation percentage is 220%, Pre-aging treatment is the disconnected of 545 DEG C of heat preservation 40min Sample is as shown in figure 9, gained elongation percentage is 293% afterwards.Comparing the preageing time is 40 DEG C, after different time isothermal holding Elongation percentage obtained by sample tensile test, it is larger that 520 DEG C of Pre-aging treatments keep the temperature the elongation percentage obtained after 40min.

Tensile property test elongation percentage is as shown in table 1 in comparative example 1 and Examples 1 to 3;Extension test in Examples 1 to 3 For elongation percentage with different pre-age temperature ranges, the changing rule of 40min heat preservation is as shown in Figure 10, when being shown in 520 DEG C and carrying out pre- Effect processing, extension test elongation percentage highest;Metastable β Titanium-alloy elongation percentage is through at a temperature of 520 DEG C in Examples 1 to 3, with different pre- The changing rule of aging time range is as shown in figure 11, and isothermal holding extension test elongation percentage of the display through 40min is higher.

The draftability of the different pre-age temperature value of table 1 and the metastable β Titanium-alloy under different preageing soaking time values It can parameter

As can be seen from Table 1, under different pre-age temperature values and preageing soaking time Parameter Conditions, to metastable β titanium After alloy carries out Pre-aging treatment, tensile property test is carried out, obtained elongation percentage compares the Asia without Pre-aging treatment 194% elongation percentage of steady beta-titanium alloy increases significantly.With 520 DEG C of pre-age temperature heat preservation 40min to metastable β Titanium-alloy After being handled, the elongation percentage of acquisition is up to 361.8%, and the elongation percentage compared to the metastable β Titanium-alloy being not handled by is 194.0%, elongation percentage improves 167.8%.

The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered It is considered as protection scope of the present invention.

Claims (2)

1. a kind of superplastic method of raising metastable β Titanium-alloy carries out Pre-aging treatment to the metastable β Titanium-alloy;It is described pre- The temperature of ageing treatment is 520 DEG C, and the time of the Pre-aging treatment is 40min;
The chemical constitution formula of the metastable β Titanium-alloy are as follows: Ti-15Mo-3Al-2.7Nb-0.2Si.
2. the method according to claim 1, wherein the temperature of the Pre-aging treatment and the Pre-aging treatment Time determine according to the following steps:
Obtain the pre-age temperature range and preageing soaking time range of metastable β Titanium-alloy;
The metastable β Titanium-alloy is carried out at preageing within the scope of the pre-age temperature range and preageing soaking time Reason;
Erichsen test test is carried out to metastable β Titanium-alloy after the Pre-aging treatment;
According to tensile property test as a result, obtaining the temperature and time for carrying out Pre-aging treatment to metastable β Titanium-alloy.
CN201610213876.3A 2016-04-07 2016-04-07 A kind of superplastic method of raising metastable state beta-titanium alloy CN105648375B (en)

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CN110396656A (en) * 2019-08-21 2019-11-01 太原理工大学 A kind of composite reinforcement process of superhigh intensity TB8 titanium alloy
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CN104726746A (en) * 2015-04-17 2015-06-24 西北有色金属研究院 High-strength metastable beta-type titanium alloy bar and production method thereof
CN104946928A (en) * 2015-06-11 2015-09-30 中国航空工业集团公司北京航空材料研究院 Titanium alloy with easily refined grains and preparing method thereof

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CN104946928A (en) * 2015-06-11 2015-09-30 中国航空工业集团公司北京航空材料研究院 Titanium alloy with easily refined grains and preparing method thereof

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