CN104588433A - Method of preparing TiAl alloy plate by virtue of spark plasma sintering and canning hot rolling - Google Patents
Method of preparing TiAl alloy plate by virtue of spark plasma sintering and canning hot rolling Download PDFInfo
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- CN104588433A CN104588433A CN201510028165.4A CN201510028165A CN104588433A CN 104588433 A CN104588433 A CN 104588433A CN 201510028165 A CN201510028165 A CN 201510028165A CN 104588433 A CN104588433 A CN 104588433A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses a method of preparing a TiAl alloy plate by virtue of spark plasma sintering and canning hot rolling, relates to a preparation method of an alloy plate and aims at solving the problems of uneven chemical components, inconsistency in tissues, poor performance of the plate and difficulty in preparation of the traditional preparation method of the TiAl alloy plate. The method comprises the following steps: carrying out spark plasma sintering on TiAl pre-alloyed powder firstly to prepare a pre-rolled plate slab, and then preparing the TiAl alloy plate by virtue of a canning hot rolling method. According to the method disclosed by the invention, the TiAl alloy plate slab prepared by spark plasma sintering is high in density, fine in tissue, uniform in components, excellent in performances, good in deformability, convenient in subsequent formation of the TiAl alloy plate, fine in grain size of the prepared plate and excellent in mechanical properties, is capable of carrying out high-temperature canning rolling on TiAl alloy at a relatively low temperature and high strain rate and is suitable for preparing the TiAl alloy plate.
Description
Technical field
The present invention relates to a kind of preparation method of sheet alloy.
Background technology
Along with Aero-Space, the fast development of the industry such as mass movement, has higher requirement to the performance of engine component, current Aeronautics and Astronautics engine component many employings nickel base superalloy and titanium alloy.Nickel-base alloy also exists the shortcomings such as quality is high, lower than great and specific strength, and titanium alloy then exists room temperture elastic modulus low and high temperature creep resistant and the shortcoming such as serviceability temperature is not enough, can not meet the technical requirement of Aeronautics and Astronautics engine gradually.TiAl alloy has that density is low, specific strength is high, specific stiffness is high, and good high-temperature oxidation resistant, creep-resistant property, is the very potential lightweight high-temperature structural material of one, has broad application prospects at industrial circles such as Aeronautics and Astronautics.
The preparation of high performance Ti Al sheet alloy is considered to the key realizing the application of TiAl alloy material through engineering approaches.The sheet material of TiAl alloy not only can directly use as structural material, but also can be processed into the parts of aerospace vehicle and engine thereof by Superplastic Forming Techniques, can expand the range of application of TiAl alloy greatly.Therefore prepare the level that TiAl lightweight high-temperature material significantly can promote the industry such as China's civilian industry and Aero-Space, effectively reduce energy resource consumption.
At present, the method of preparing TiAl alloy sheet material is mainly by carrying out high temperature pack rolling realization to TiAl alloy ingot casting, but easily there is gross segregation, dendritic segregation in ingot metallurgy process, uneven chemical components, organize the defects such as inconsistent, cause the high temperature deformation ability of TiAl alloy poor, be not suitable as the blank of preparation TiAl alloy sheet material.By contrast, powder metallurgy can prepare the tiny and uniform slab of chemical cost of crystal grain, is that to produce TiAl sheet material necessary.In order to avoid the impurity contents such as oxygen pollute TiAl powder, worsen the performance of TiAl alloy, adopt TiAl prealloy powder, have microstructure and composition even, the impurity contents such as oxygen are low, are suitable as raw material and prepare TiAl alloy.
The universal method that powder metallurgy prepares TiAl alloy sheet material is by TiAl alloy powder high temperature insostatic pressing (HIP) under the condition of temperature 1100 ~ 1300 DEG C, pressure 140 ~ 200Mpa, time 2 ~ 4h, preparation TiAl alloy slab, subsequently high temperature insostatic pressing (HIP) slab is carried out surface treatment, jacket, then carry out high temperature jacket and roll.Compare the method, the present invention first carries out discharge plasma sintering to TiAl prealloy powder and prepares blank, the method of carrying out jacket hot rolling again prepares the method for TiAl alloy sheet material, TiAl alloy slab density prepared by discharge plasma sintering is high, fine microstructures, uniform composition, excellent performance, deformability are good, be beneficial to the shaping of follow-up TiAl alloy sheet material, and then the pack rolling of TiAl alloy can be carried out at relatively low temperature and higher strain rate.
Summary of the invention
The object of the invention is to solve existing TiAl alloy preparation of plates method and there is uneven chemical components, organize inconsistent, plate property is poor and the problem of preparation difficulty, and provides a kind of discharge plasma sintering and jacket hot rolling for the method for TiAl alloy sheet material.
Discharge plasma sintering and jacket hot rolling, for a method for TiAl alloy sheet material, specifically complete according to the following steps:
One, raw material prepare: to take particle diameter be the nominal chemical composition of 0.5 μm ~ 325 μm is the TiAl pre-alloyed powder of Ti-(40 ~ 50) Al-(0.1 ~ 10) X (at%);
In Ti-(40 ~ 50) Al-(0.1 ~ 10) X (at%) described in step one, X is the mixing of one or more in Mo, Cr, Nb, V, Si, Fe, Zr, Mn, B, C, W and Y;
Nominal chemical composition described in step one is that the TiAl prealloy powder of Ti-(40 ~ 50) Al-(0.1 ~ 10) X (at%) is prepared by inert gas atomizer technology or PREP technology;
Two, discharge plasma sintering:
TiAl pre-alloyed powder step one taken puts into graphite jig, is 10MPa ~ 200MPa at pressure, and temperature is 900 DEG C ~ 1300 DEG C and vacuum is 10
-4sinter 1min ~ 60min under Pa ~ 10Pa, obtain the blank that density is 95% ~ 100%;
Three, turnery processing:
The density that step 2 is obtained be 95% ~ 100% blank carry out turnery processing and rounding, obtain the slab that surface smoothness is Ra6 ~ Ra8;
Four, slab jacket:
Surface smoothness step 3 obtained is that jacket put into by the slab of Ra6 ~ Ra8, then carries out soldering and sealing, is surrounded by the jacket of slab after obtaining soldering and sealing;
Jacket described in step 4 is stainless steel jacket, pure titanium jacket or titanium alloy jacket;
The thickness of the jacket described in step 4 is 1mm ~ 20mm;
Five, high temperature pack rolling:
The jacket being surrounded by slab after soldering and sealing step 4 obtained puts into heating furnace, again by heating furnace from room temperature to 1000 DEG C ~ 1280 DEG C, 0.5h ~ 4h is incubated again at temperature is 1000 DEG C ~ 1280 DEG C, be that the jacket being surrounded by slab after 1000 DEG C ~ 1280 DEG C soldering and sealing is placed on milling train again by temperature, rolling speed be 0.01m/s ~ 1.5m/s, pass deformation is 5% ~ 30%, rolling total deformation be 30% ~ 90% and passage melt down at temperature is 1000 DEG C ~ 1280 DEG C, be rolled under the condition of insulation 2min ~ 60min, obtain rolled piece; Rolled piece being placed on temperature is in the heating furnace of 1000 DEG C ~ 1280 DEG C again, turn off the power supply of heating furnace again, rolled piece is chilled to 100 DEG C ~ 900 DEG C naturally, then is that 100 DEG C ~ 900 DEG C rolled pieces take out from heating furnace by temperature, naturally cool to room temperature, obtain the rolled plate with jacket;
Six, jacket is removed:
Adopt obtain in machining process removal step five with the jacket in the rolled plate of jacket, obtain TiAl alloy sheet material.
Advantage of the present invention:
One, discharge plasma sintering method is adopted in the present invention, discharge plasma sintering can be at a lower temperature, prepare in shorter sintering time that density is high, fine microstructures, uniform composition, the TiAl alloy blank that oxygen content is lower, excellent performance, deformability are good, and the present invention controls tissue by controlling sintering temperature, is applicable to the slab of preparation TiAl alloy.And simple to operate, do not need special masterful technique;
Two, discharge plasma sintering blank, hot-working character is good, is beneficial to the shaping of follow-up TiAl alloy sheet material, can carries out the high temperature pack rolling of TiAl alloy at relatively low temperature and higher strain rate, the sheet material crystallite dimension of preparation is tiny, excellent in mechanical performance;
Three, the room temperature tensile intensity of TiAl alloy sheet material that prepared by the present invention is 550MPa ~ 800MPa.
The present invention can obtain a kind of discharge plasma sintering and the jacket hot rolling method for TiAl alloy sheet material.
Detailed description of the invention
Detailed description of the invention one: present embodiment be a kind of discharge plasma sintering and jacket hot rolling for the method for TiAl alloy sheet material, specifically complete according to the following steps:
One, raw material prepare: to take particle diameter be the nominal chemical composition of 0.5 μm ~ 325 μm is the TiAl pre-alloyed powder of Ti-(40 ~ 50) Al-(0.1 ~ 10) X (at%);
In Ti-(40 ~ 50) Al-(0.1 ~ 10) X (at%) described in step one, X is the mixing of one or more in Mo, Cr, Nb, V, Si, Fe, Zr, Mn, B, C, W and Y;
Nominal chemical composition described in step one is that the TiAl prealloy powder of Ti-(40 ~ 50) Al-(0.1 ~ 10) X (at%) is prepared by inert gas atomizer technology or PREP technology;
Two, discharge plasma sintering:
TiAl pre-alloyed powder step one taken puts into graphite jig, is 10MPa ~ 200MPa at pressure, and temperature is 900 DEG C ~ 1300 DEG C and vacuum is 10
-4sinter 1min ~ 60min under Pa ~ 10Pa, obtain the blank that density is 95% ~ 100%;
Three, turnery processing:
The density that step 2 is obtained be 95% ~ 100% blank carry out turnery processing and rounding, obtain the slab that surface smoothness is Ra6 ~ Ra8;
Four, slab jacket:
Surface smoothness step 3 obtained is that jacket put into by the slab of Ra6 ~ Ra8, then carries out soldering and sealing, is surrounded by the jacket of slab after obtaining soldering and sealing;
Jacket described in step 4 is stainless steel jacket, pure titanium jacket or titanium alloy jacket;
The thickness of the jacket described in step 4 is 1mm ~ 20mm;
Five, high temperature pack rolling:
The jacket being surrounded by slab after soldering and sealing step 4 obtained puts into heating furnace, again by heating furnace from room temperature to 1000 DEG C ~ 1280 DEG C, 0.5h ~ 4h is incubated again at temperature is 1000 DEG C ~ 1280 DEG C, be that the jacket being surrounded by slab after 1000 DEG C ~ 1280 DEG C soldering and sealing is placed on milling train again by temperature, rolling speed be 0.01m/s ~ 1.5m/s, pass deformation is 5% ~ 30%, rolling total deformation be 30% ~ 90% and passage melt down at temperature is 1000 DEG C ~ 1280 DEG C, be rolled under the condition of insulation 2min ~ 60min, obtain rolled piece; Rolled piece being placed on temperature is in the heating furnace of 1000 DEG C ~ 1280 DEG C again, turn off the power supply of heating furnace again, rolled piece is chilled to 100 DEG C ~ 900 DEG C naturally, then is that 100 DEG C ~ 900 DEG C rolled pieces take out from heating furnace by temperature, naturally cool to room temperature, obtain the rolled plate with jacket;
Six, jacket is removed:
Adopt obtain in machining process removal step five with the jacket in the rolled plate of jacket, obtain TiAl alloy sheet material.
One, discharge plasma sintering method is adopted in present embodiment, discharge plasma sintering can be at a lower temperature, prepare in shorter sintering time that density is high, fine microstructures, uniform composition, the TiAl alloy blank that oxygen content is lower, excellent performance, deformability are good, and the present invention controls tissue by controlling sintering temperature, is applicable to the slab of preparation TiAl alloy.And simple to operate, do not need special masterful technique;
Two, discharge plasma sintering blank, hot-working character is good, is beneficial to the shaping of follow-up TiAl alloy sheet material, can carries out the high temperature pack rolling of TiAl alloy at relatively low temperature and higher strain rate, sheet material crystallite dimension is tiny, excellent in mechanical performance;
Three, the room temperature tensile intensity of TiAl alloy sheet material that prepared by present embodiment is 550MPa ~ 800MPa.
Present embodiment can obtain a kind of discharge plasma sintering and the jacket hot rolling method for TiAl alloy sheet material.
Detailed description of the invention two: present embodiment and detailed description of the invention one difference are: to take particle diameter in step one be the nominal chemical composition of 0.5 μm ~ 325 μm is the TiAl pre-alloyed powder of Ti-(42 ~ 45) Al-(0.3 ~ 10) X (at%).Other steps are identical with detailed description of the invention one.
Detailed description of the invention three: one of present embodiment and detailed description of the invention one or two difference is: to take particle diameter in step one be the nominal chemical composition of 0.5 μm ~ 325 μm is the TiAl pre-alloyed powder of Ti-(45 ~ 48) Al-(0.2 ~ 6.5) X (at%).Other steps are identical with detailed description of the invention one or two.
Detailed description of the invention four: one of present embodiment and detailed description of the invention one to three difference is: to take particle diameter in step one be the nominal chemical composition of 0.5 μm ~ 325 μm is the TiAl pre-alloyed powder of Ti-43Al-9V-0.3Y (at%).Other steps are identical with detailed description of the invention one to three.
Detailed description of the invention five: one of present embodiment and detailed description of the invention one to four difference is: TiAl pre-alloyed powder step one taken in step 2 puts into graphite jig, be 40MPa ~ 100MPa at pressure, temperature is 900 DEG C ~ 1200 DEG C and vacuum is 10
-4sinter 1min ~ 20min under Pa ~ 10Pa, obtain the blank that density is 95% ~ 100%.Other steps are identical with detailed description of the invention one to four.
Detailed description of the invention six: one of present embodiment and detailed description of the invention one to five difference is: TiAl pre-alloyed powder step one taken in step 2 puts into graphite jig, be 30MPa ~ 90Mpa at pressure, temperature is 950 DEG C ~ 1250 DEG C and vacuum is 10
-3pa ~ 10
-1sinter 2min ~ 15min under Pa, obtain the blank that density is 95% ~ 100%.Other steps are identical with detailed description of the invention one to five.
Detailed description of the invention seven: one of present embodiment and detailed description of the invention one to six difference is: the jacket being surrounded by slab after soldering and sealing step 4 obtained in step 5 puts into heating furnace, again by heating furnace from room temperature to 1100 DEG C ~ 1250 DEG C, at temperature is 1100 DEG C ~ 1250 DEG C, be incubated 1h ~ 2h again, then be that the jacket being surrounded by slab after 1100 DEG C ~ 1250 DEG C soldering and sealing is placed on milling train by temperature.Other steps are identical with detailed description of the invention one to six.
Detailed description of the invention eight: one of present embodiment and detailed description of the invention one to seven difference is: in step 5 rolling speed be 0.01m/s ~ 0.5m/s, pass deformation is 8% ~ 20%, rolling total deformation be 60% ~ 90% and passage melt down be incubated the condition of 4min ~ 10min at temperature is 1100 DEG C ~ 1250 DEG C under be rolled, obtain rolled piece.Other steps are identical with detailed description of the invention one to seven.
Detailed description of the invention nine: one of present embodiment and detailed description of the invention one to eight difference is: the jacket being surrounded by slab after soldering and sealing step 4 obtained in step 5 puts into heating furnace, again by heating furnace from room temperature to 1120 DEG C ~ 1240 DEG C, at temperature is 1120 DEG C ~ 1240 DEG C, be incubated 1h ~ 1.5h again, then be that the jacket being surrounded by slab after 1120 DEG C ~ 1240 DEG C soldering and sealing is placed on milling train by temperature.Other steps are identical with detailed description of the invention one to eight.
Detailed description of the invention ten: one of present embodiment and detailed description of the invention one to nine difference is: be 0.01m/s ~ 1.0m/s in rolling speed in step 5, pass deformation is 8% ~ 20%, rolling total deformation be 60% ~ 90% and passage to melt down temperature be rolled under being incubated the condition of 5min ~ 15min at 1120 DEG C ~ 1240 DEG C, obtain rolled piece.Other steps are identical with detailed description of the invention one to nine.
Adopt the beneficial effect of following this name of verification experimental verification:
Test one: a kind of discharge plasma sintering and jacket hot rolling specifically complete according to the following steps for the method for TiAl alloy sheet material:
One, raw material prepare: to take particle diameter be the nominal chemical composition of 0.5 μm ~ 250 μm is the TiAl pre-alloyed powder of Ti-47Al-2Cr-2Nb (at%);
Two, discharge plasma sintering:
TiAl pre-alloyed powder step one taken puts into graphite jig, is 50MPa at pressure, and temperature is 1180 DEG C and vacuum is 10
-3sinter 6min under Pa, obtain the blank that density is 99%;
Three, turnery processing:
The density that step 2 is obtained be 99% blank carry out turnery processing and rounding, obtain the slab that surface smoothness is Ra6;
Four, slab jacket:
Surface smoothness step 3 obtained is that jacket put into by the slab of Ra6, then carries out soldering and sealing, is surrounded by the jacket of slab after obtaining soldering and sealing;
Jacket described in step 4 is pure titanium jacket;
The thickness of the jacket described in step 4 is 4mm;
Five, high temperature pack rolling:
The jacket being surrounded by slab after soldering and sealing step 4 obtained puts into heating furnace, again by heating furnace from room temperature to 1200 DEG C, 50min is incubated again at temperature is 1200 DEG C, be that the jacket being surrounded by slab after 1200 DEG C of soldering and sealing is placed on milling train again by temperature, be 0.25m/s in rolling speed, pass deformation is 12%, rolling total deformation be 67% and passage to melt down temperature be rolled under being incubated the condition of 6min at 1200 DEG C, obtain rolled piece; Rolled piece being placed on temperature is in the heating furnace of 1000 DEG C again, then turns off the power supply of heating furnace, and rolled piece naturally cools to 400 DEG C, then is that 400 DEG C of rolled pieces take out from heating furnace by temperature, naturally cools to room temperature, obtains the rolled plate with jacket;
Six, jacket is removed:
Adopt obtain in machining process removal step five with the jacket in the rolled plate of jacket, obtain TiAl alloy sheet material.
The TiAl pre-alloyed powder of to be the nominal chemical composition of 0.5 μm ~ 250 μm the be Ti-47Al-2Cr-2Nb (at%) of the particle diameter described in this test procedure one is prepared by PREP technology.
Obtaining surface smoothness in this test procedure step 3 is that the slab of Ra6 is of a size of 70mm × 70mm × 7mm;
The TiAl alloy sheet material obtained in this test procedure six is of a size of 290mm × 70mm × 1.56mm, and room temperature tensile intensity is 550MPa, and room temperature percentage elongation is 0.9%.
Test two: a kind of discharge plasma sintering and jacket hot rolling specifically complete according to the following steps for the method for TiAl alloy sheet material:
One, raw material prepare: to take particle diameter be the nominal chemical composition of 0.5 μm ~ 120 μm is the TiAl pre-alloyed powder of Ti-43Al-9V-0.3Y (at%);
Two, discharge plasma sintering:
TiAl pre-alloyed powder step one taken puts into graphite jig, is 60MPa at pressure, and temperature is 1200 DEG C and vacuum is 10
-3sinter 5min under Pa, obtain the blank that density is 99.5%;
Three, turnery processing:
The density that step 2 is obtained be 99% blank carry out turnery processing and rounding, obtain the slab that surface smoothness is Ra6;
Four, slab jacket:
Surface smoothness step 3 obtained is that jacket put into by the slab of Ra6, then carries out soldering and sealing, is surrounded by the jacket of slab after obtaining soldering and sealing;
Jacket described in step 4 is stainless steel jacket;
The thickness of the jacket described in step 4 is 4mm;
Five, high temperature pack rolling:
The jacket being surrounded by slab after soldering and sealing step 4 obtained puts into heating furnace, again by heating furnace from room temperature to 1180 DEG C, 50min is incubated again at temperature is 1180 DEG C, be that the jacket being surrounded by slab after 1180 DEG C of soldering and sealing is placed on milling train again by temperature, be 0.3m/s in rolling speed, pass deformation is 12%, rolling total deformation be 67% and passage to melt down temperature be rolled under being incubated the condition of 6min at 1180 DEG C, obtain rolled piece; Rolled piece being placed on temperature is in the heating furnace of 1050 DEG C again, then turns off the power supply of heating furnace, and rolled piece naturally cools to 200 DEG C, then is that 200 DEG C of rolled pieces take out from heating furnace by temperature, naturally cools to room temperature, obtains the rolled plate with jacket;
Six, jacket is removed:
Adopt obtain in machining process removal step five with the jacket in the rolled plate of jacket, obtain TiAl alloy sheet material.
The TiAl pre-alloyed powder of to be the nominal chemical composition of 0.5 μm ~ 120 μm the be Ti-43Al-9V-0.3Y (at%) of the particle diameter described in this test procedure one is prepared by inert gas atomizer technology.
Obtaining surface smoothness in this test procedure step 3 is that the slab of Ra6 is of a size of 75mm × 70mm × 4mm;
The TiAl alloy sheet material obtained in this test procedure six is of a size of 360mm × 70mm × 0.8mm, and room temperature tensile intensity is 750MPa, and room temperature percentage elongation is 1.5%.
Test three: a kind of discharge plasma sintering and jacket hot rolling specifically complete according to the following steps for the method for TiAl alloy sheet material:
One, raw material prepare: to take particle diameter be the nominal chemical composition of 0.5 μm ~ 180 μm is the TiAl pre-alloyed powder of Ti-45Al-5Nb-0.2B-0.25Y (at%);
Two, discharge plasma sintering:
TiAl pre-alloyed powder step one taken puts into graphite jig, is 80MPa at pressure, and temperature is 1250 DEG C and vacuum is 10
-2sinter 10min under Pa, obtain the blank that density is 99.8%;
Three, turnery processing:
The density that step 2 is obtained be 99.8% blank carry out turnery processing and rounding, obtain the slab that surface smoothness is Ra6;
Four, slab jacket:
Surface smoothness step 3 obtained is that jacket put into by the slab of Ra6, then carries out soldering and sealing, is surrounded by the jacket of slab after obtaining soldering and sealing;
Jacket described in step 4 is pure titanium jacket;
The thickness of the jacket described in step 4 is 4mm;
Five, high temperature pack rolling:
The jacket being surrounded by slab after soldering and sealing step 4 obtained puts into heating furnace, again by heating furnace from room temperature to 1230 DEG C, 50min is incubated again at temperature is 1230 DEG C, be that the jacket being surrounded by slab after 1230 DEG C of soldering and sealing is placed on milling train again by temperature, be 0.2m/s in rolling speed, pass deformation is 10%, rolling total deformation be 74% and passage to melt down temperature be rolled under being incubated the condition of 5min at 1230 DEG C, obtain rolled piece; Rolled piece being placed on temperature is in the heating furnace of 1100 DEG C again, then turns off the power supply of heating furnace, and rolled piece is chilled to 200 DEG C naturally, then is that 200 DEG C of rolled pieces take out from heating furnace by temperature, naturally cools to room temperature, obtains the rolled plate with jacket;
Six, jacket is removed:
Adopt obtain in machining process removal step five with the jacket in the rolled plate of jacket, obtain TiAl alloy sheet material.
The TiAl pre-alloyed powder of to be the nominal chemical composition of 0.5 μm ~ 180 μm the be Ti-45Al-5Nb-0.2B-0.25Y (at%) of the particle diameter described in this test procedure one is prepared by inert gas atomizer technology.
Obtaining surface smoothness in this test procedure step 3 is that the slab of Ra6 is of a size of 75mm × 60mm × 6mm;
The TiAl alloy sheet material obtained in this test procedure six is of a size of 295mm × 60mm × 1.48mm, and room temperature tensile intensity is 650MPa, and room temperature percentage elongation is 0.8%.
Claims (10)
1. discharge plasma sintering and jacket hot rolling are for a method for TiAl alloy sheet material, it is characterized in that what a kind of discharge plasma sintering and jacket hot rolling specifically completed according to the following steps for the method for TiAl alloy sheet material:
One, raw material prepare: to take particle diameter be the nominal chemical composition of 0.5 μm ~ 325 μm is the TiAl pre-alloyed powder of Ti-(40 ~ 50) Al-(0.1 ~ 10) X (at%);
In Ti-(40 ~ 50) Al-(0.1 ~ 10) X (at%) described in step one, X is the mixing of one or more in Mo, Cr, Nb, V, Si, Fe, Zr, Mn, B, C, W and Y;
Nominal chemical composition described in step one is that the TiAl prealloy powder of Ti-(40 ~ 50) Al-(0.1 ~ 10) X (at%) is prepared by inert gas atomizer technology or PREP technology;
Two, discharge plasma sintering:
TiAl pre-alloyed powder step one taken puts into graphite jig, is 10MPa ~ 200MPa at pressure, and temperature is 900 DEG C ~ 1300 DEG C and vacuum is 10
-4sinter 1min ~ 60min under Pa ~ 10Pa, obtain the blank that density is 95% ~ 100%;
Three, turnery processing:
The density that step 2 is obtained be 95% ~ 100% blank carry out turnery processing and rounding, obtain the slab that surface smoothness is Ra6 ~ Ra8;
Four, slab jacket:
Surface smoothness step 3 obtained is that jacket put into by the slab of Ra6 ~ Ra8, then carries out soldering and sealing, is surrounded by the jacket of slab after obtaining soldering and sealing;
Jacket described in step 4 is stainless steel jacket, pure titanium jacket or titanium alloy jacket;
The thickness of the jacket described in step 4 is 1mm ~ 20mm;
Five, high temperature pack rolling:
The jacket being surrounded by slab after soldering and sealing step 4 obtained puts into heating furnace, again by heating furnace from room temperature to 1000 DEG C ~ 1280 DEG C, 0.5h ~ 4h is incubated again at temperature is 1000 DEG C ~ 1280 DEG C, be that the jacket being surrounded by slab after 1000 DEG C ~ 1280 DEG C soldering and sealing is placed on milling train again by temperature, rolling speed be 0.01m/s ~ 1.5m/s, pass deformation is 5% ~ 30%, rolling total deformation be 30% ~ 90% and passage melt down at temperature is 1000 DEG C ~ 1280 DEG C, be rolled under the condition of insulation 2min ~ 60min, obtain rolled piece; Rolled piece being placed on temperature is in the heating furnace of 1000 DEG C ~ 1280 DEG C again, turn off the power supply of heating furnace again, rolled piece is chilled to 100 DEG C ~ 900 DEG C naturally, then is that 100 DEG C ~ 900 DEG C rolled pieces take out from heating furnace by temperature, naturally cool to room temperature, obtain the rolled plate with jacket;
Six, jacket is removed:
Adopt obtain in machining process removal step five with the jacket in the rolled plate of jacket, obtain TiAl alloy sheet material.
2. a kind of discharge plasma sintering according to claim 1 and jacket hot rolling are for the method for TiAl alloy sheet material, and to it is characterized in that taking in step one particle diameter be the nominal chemical composition of 0.5 μm ~ 325 μm is the TiAl pre-alloyed powder of Ti-(42 ~ 45) Al-(0.3 ~ 10) X (at%).
3. a kind of discharge plasma sintering according to claim 1 and jacket hot rolling are for the method for TiAl alloy sheet material, and to it is characterized in that taking in step one particle diameter be the nominal chemical composition of 0.5 μm ~ 325 μm is the TiAl pre-alloyed powder of Ti-(45 ~ 48) Al-(0.2 ~ 6.5) X (at%).
4. a kind of discharge plasma sintering according to claim 1 and jacket hot rolling are for the method for TiAl alloy sheet material, and to it is characterized in that taking in step one particle diameter be the nominal chemical composition of 0.5 μm ~ 325 μm is the TiAl pre-alloyed powder of Ti-43Al-9V-0.3Y (at%).
5. a kind of discharge plasma sintering according to claim 1 and jacket hot rolling are for the method for TiAl alloy sheet material, it is characterized in that TiAl pre-alloyed powder step one taken in step 2 puts into graphite jig, be 40MPa ~ 100MPa at pressure, temperature is 900 DEG C ~ 1200 DEG C and vacuum is 10
-4sinter 1min ~ 20min under Pa ~ 10Pa, obtain the blank that density is 95% ~ 100%.
6. a kind of discharge plasma sintering according to claim 1 and jacket hot rolling are for the method for TiAl alloy sheet material, it is characterized in that TiAl pre-alloyed powder step one taken in step 2 puts into graphite jig, be 30MPa ~ 90Mpa at pressure, temperature is 950 DEG C ~ 1250 DEG C and vacuum is 10
-3pa ~ 10
-1sinter 2min ~ 15min under Pa, obtain the blank that density is 95% ~ 100%.
7. a kind of discharge plasma sintering according to claim 1 and jacket hot rolling are for the method for TiAl alloy sheet material, the jacket being surrounded by slab after it is characterized in that soldering and sealing step 4 obtained in step 5 puts into heating furnace, again by heating furnace from room temperature to 1100 DEG C ~ 1250 DEG C, at temperature is 1100 DEG C ~ 1250 DEG C, be incubated 1h ~ 2h again, then be that the jacket being surrounded by slab after 1100 DEG C ~ 1250 DEG C soldering and sealing is placed on milling train by temperature.
8. a kind of discharge plasma sintering according to claim 1 and jacket hot rolling are for the method for TiAl alloy sheet material, it is characterized in that in step 5 rolling speed be 0.01m/s ~ 0.5m/s, pass deformation is 8% ~ 20%, rolling total deformation be 60% ~ 90% and passage melt down be incubated the condition of 4min ~ 10min at temperature is 1100 DEG C ~ 1250 DEG C under be rolled, obtain rolled piece.
9. a kind of discharge plasma sintering according to claim 1 and jacket hot rolling are for the method for TiAl alloy sheet material, the jacket being surrounded by slab after it is characterized in that soldering and sealing step 4 obtained in step 5 puts into heating furnace, again by heating furnace from room temperature to 1120 DEG C ~ 1240 DEG C, at temperature is 1120 DEG C ~ 1240 DEG C, be incubated 1h ~ 1.5h again, then be that the jacket being surrounded by slab after 1120 DEG C ~ 1240 DEG C soldering and sealing is placed on milling train by temperature.
10. a kind of discharge plasma sintering according to claim 1 and jacket hot rolling are for the method for TiAl alloy sheet material, to it is characterized in that in step 5 in rolling speed being 0.01m/s ~ 1.0m/s, pass deformation is 8% ~ 20%, rolling total deformation be 60% ~ 90% and passage to melt down temperature be rolled under being incubated the condition of 5min ~ 15min at 1120 DEG C ~ 1240 DEG C, obtain rolled piece.
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