CN105108156A - Method for preparing TiAl/Ti alloy laminated composite board through powder metallurgy - Google Patents
Method for preparing TiAl/Ti alloy laminated composite board through powder metallurgy Download PDFInfo
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- CN105108156A CN105108156A CN201510589629.9A CN201510589629A CN105108156A CN 105108156 A CN105108156 A CN 105108156A CN 201510589629 A CN201510589629 A CN 201510589629A CN 105108156 A CN105108156 A CN 105108156A
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Abstract
The invention provides a method for preparing a TiAl/Ti alloy laminated composite board through powder metallurgy. The method comprises the steps of preparation of raw materials, spark plasma sintering, cutting, board blank stacking, wrapping through jackets, high-temperature wrapping jacket rolling, and wrapping jacket removal. The dimension of the composite board obtained through the method is 230 mm*80 mm*1.2 mm, the indoor-temperature tensile strength of the composite board can reach 1200 MPa, the indoor-temperature plasticity of the composite board is 4%-5%, the tensile strength of the composite board can reach 900 MPa at the temperature of 700 DEG C, and the plasticity of the composite board is 10%-15% at the temperature of 700 DEG C.
Description
Technical field
The present invention relates to a kind of method that powder metallurgy prepares TiAl/Ti alloy stratiform composite board.
Background technology
Current, along with the development of aeronautical and space technology, also more and more higher to the requirement of aircraft.The lifting of loss of weight to aircraft self performance of aircraft engine is significant.Now widely used Ni based high-temperature alloy is because of the comparatively large requirement that cannot meet the further loss of weight of engine of its density.Therefore, in the urgent need to Development of Novel lightweight high-temperature structural material.TiAl alloy is high with its density low and high temperature intensity, creep-resistant property good and anti-oxidant can be excellent etc. advantage, become the leading candidate material of alternative Ni base alloy.TiAl alloy serviceability temperature is higher, can reach 700 DEG C ~ 900 DEG C.Based on the performance of TiAl alloy excellence, the research carrying out TiAl alloy is significant for realizing the application of its through engineering approaches early.
But due to TiAl alloy intrinsic property, belong to difficult pyroplastic deformation material, the constraints that plate rolling is relevant is more, and in the operation of rolling, the thermal strain state of material is also very complicated, easily ftractures, and obtains large scale, high-quality sheet material is very difficult.Bottleneck in technology of preparing hinders the through engineering approaches application of TiAl alloy sheet material.
Summary of the invention
The object of the invention is the problem that plate rolling process in which materials easily ftractures, intensity is not high, temperature-room type plasticity is low in order to solve, and provide a kind of method that powder metallurgy prepares TiAl/Ti alloy stratiform composite board.
A kind of powder metallurgy of the present invention prepares the method for TiAl/Ti alloy stratiform composite board, and it completes according to the following steps:
One, raw material prepare: to take particle diameter be the nominal chemical composition of 0.5 μm ~ 250 μm is the TiAl prealloy powder of Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 2) Z (at%), takes pure titanium or titanium alloy prealloy powder that particle diameter is 0.5 μm ~ 250 μm;
Wherein, X is beta phase stable element, and Z is micro alloying element;
Nominal chemical composition described in step one is that the TiAl pre-alloyed powder of Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 2) Z (at%) is prepared by inert gas atomizer method or rotating electrode atomized method;
Pure titanium described in step one or titanium alloy pre-alloyed powder are prepared by inert gas atomizer method or rotating electrode atomized method;
Two, discharge plasma sintering: the TiAl pre-alloyed powder of to be the nominal chemical composition of 0.5 μm ~ 250 μm by the particle diameter taken in step one be Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 2) Z (at%) puts into crystal vessel, vacuum outgas, carry out discharge plasma sintering, obtain the TiAl alloy slab that density is 95% ~ 100%;
Three, be that the pure titanium of 0.5 μm ~ 250 μm or titanium alloy prealloy powder put into crystal vessel, vacuum outgas by the particle diameter taken in step one, carry out discharge plasma sintering, obtain pure titanium or titanium alloy slab that density is 95% ~ 100%;
The temperature of step 2 and the vacuum outgas described in step 3 is room temperature, and vacuum is 0.01 ~ 1Pa;
The heating rate of step 2 and the discharge plasma sintering described in step 3 is 10 DEG C/min ~ 200 DEG C/min;
The temperature of step 2 and the discharge plasma sintering described in step 3 is 900 DEG C ~ 1400 DEG C, and pressure is 5MPa ~ 100MPa, and temperature retention time is 2min ~ 180min, cools after insulation with stove;
Four, cutting processing: the TiAl alloy slab obtained and pure titanium or titanium alloy slab are carried out Linear cut and rounding, obtains that surface smoothness is Ra6 ~ Ra8, length and width are (10 ~ 200) mm × (10 ~ 200) mm and thickness is the prefabricated slab of TiAl alloy of 0.3 ~ 30mm and pure titanium or the prefabricated slab of titanium alloy;
Five, jacket: prefabricated for TiAl alloy in step 4 slab and pure titanium or the prefabricated slab of titanium alloy are stacked; The mode of stacking is: be stacked alternately the prefabricated slab of TiAl alloy and pure titanium or the prefabricated slab of titanium alloy to 2n+1 layer in the mode of the prefabricated slab of TiAl alloy/pure titanium or the prefabricated slab of titanium alloy, obtain final stacking slab; Wherein, n is the integer of 1 ~ 50; The both sides of final stacking slab are the prefabricated slab of TiAl alloy;
Final stacking slab is placed in jacket, then carries out sealing;
Six, high temperature pack rolling: the jacket after soldering and sealing step 5 obtained puts into heating furnace, again by heating furnace from room temperature to 1000 DEG C ~ 1350 DEG C, 5min ~ 120min is incubated again at temperature is 1000 DEG C ~ 1350 DEG C, again jacket is placed on milling train, rolling speed be 0.01m/s ~ 2.5m/s, pass deformation is 5% ~ 40%, rolling total deformation be 30% ~ 90% and passage melt down that temperature is 1000 DEG C ~ 1350 DEG C, temperature retention time is rolled under being the condition of 5min ~ 60min, obtain rolled piece; Rolled piece being placed on temperature is in the heating furnace of 1000 DEG C ~ 1350 DEG C again, turns off the power supply of heating furnace, treats that rolled piece naturally cools to 100 DEG C ~ 600 DEG C, then is taken out from heating furnace by rolled piece, naturally cool to room temperature, obtain the rolled piece being surrounded by jacket;
Seven, jacket is removed:
Adopt the jacket be surrounded by the rolled piece of jacket obtained in machining process removal step six, obtain TiAl/Ti alloy stratiform composite board.
The present invention comprises following beneficial effect:
The present invention adopt discharge plasma sintering technique collection powder forming and be sintered in one, do not need preshaped, without any need for additive and binding agent yet.Its homogeneous heating, quick heating, sintering temperature are low, sintering time is short, efficiency is high, fine microstructures is even, protect raw-material nature, can obtain the material of high-compactness, are conducive to the post forming of sheet material.Be conducive to preparing large scale, high strength, the TiAl/Ti alloy laminar composite of high-ductility.
The present invention is by placing introduce titanium alloy as toughness reinforcing phase by the prefabricated slab of TiAl alloy of preparation and pure titanium or titanium alloy prefabricated slab alternative stacked, be conducive to the two compatible deformation, be conducive to preparing high strength, the TiAl/Ti alloy laminar composite of high-ductility.
The composite board that the present invention obtains is of a size of 230mm × 80mm × 1.2mm, and room temperature tensile intensity can reach 1200MPa, and temperature-room type plasticity is 4 ~ 5%.700 DEG C of tensile strength can reach 900MPa, and 700 DEG C of plasticity are 10 ~ 15%.
Detailed description of the invention
Detailed description of the invention one: a kind of powder metallurgy of present embodiment prepares the method for TiAl/Ti alloy stratiform composite board, and it completes according to the following steps:
One, raw material prepare: to take particle diameter be the nominal chemical composition of 0.5 μm ~ 250 μm is the TiAl prealloy powder of Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 2) Z (at%), takes pure titanium or titanium alloy prealloy powder that particle diameter is 0.5 μm ~ 250 μm;
Wherein, X is beta phase stable element, and Z is micro alloying element;
Nominal chemical composition described in step one is that the TiAl pre-alloyed powder of Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 2) Z (at%) is prepared by inert gas atomizer method or rotating electrode atomized method;
Pure titanium described in step one or titanium alloy pre-alloyed powder are prepared by inert gas atomizer method or rotating electrode atomized method;
Four, discharge plasma sintering: the TiAl pre-alloyed powder of to be the nominal chemical composition of 0.5 μm ~ 250 μm by the particle diameter taken in step one be Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 2) Z (at%) puts into crystal vessel, vacuum outgas, carry out discharge plasma sintering, obtain the TiAl alloy slab that density is 95% ~ 100%;
Five, be that the pure titanium of 0.5 μm ~ 250 μm or titanium alloy prealloy powder put into crystal vessel, vacuum outgas by the particle diameter taken in step one, carry out discharge plasma sintering, obtain pure titanium or titanium alloy slab that density is 95% ~ 100%;
The temperature of step 2 and the vacuum outgas described in step 3 is room temperature, and vacuum is 0.01 ~ 1Pa;
The heating rate of step 2 and the discharge plasma sintering described in step 3 is 10 DEG C/min ~ 200 DEG C/min;
The temperature of step 2 and the discharge plasma sintering described in step 3 is 900 DEG C ~ 1400 DEG C, and pressure is 5MPa ~ 100MPa, and temperature retention time is 2min ~ 180min, cools after insulation with stove;
Four, cutting processing: the TiAl alloy slab obtained and pure titanium or titanium alloy slab are carried out Linear cut and rounding, obtains that surface smoothness is Ra6 ~ Ra8, length and width are (10 ~ 200) mm × (10 ~ 200) mm and thickness is the prefabricated slab of TiAl alloy of 0.3 ~ 30mm and pure titanium or the prefabricated slab of titanium alloy;
Five, jacket: prefabricated for TiAl alloy in step 4 slab and pure titanium or the prefabricated slab of titanium alloy are stacked; The mode of stacking is: be stacked alternately the prefabricated slab of TiAl alloy and pure titanium or the prefabricated slab of titanium alloy to 2n+1 layer in the mode of the prefabricated slab of TiAl alloy/pure titanium or the prefabricated slab of titanium alloy, obtain final stacking slab; Wherein, n is the integer of 1 ~ 50; The both sides of final stacking slab are the prefabricated slab of TiAl alloy;
Final stacking slab is placed in jacket, then carries out sealing;
Six, high temperature pack rolling: the jacket after soldering and sealing step 5 obtained puts into heating furnace, again by heating furnace from room temperature to 1000 DEG C ~ 1350 DEG C, 5min ~ 120min is incubated again at temperature is 1000 DEG C ~ 1350 DEG C, again jacket is placed on milling train, rolling speed be 0.01m/s ~ 2.5m/s, pass deformation is 5% ~ 40%, rolling total deformation be 30% ~ 90% and passage melt down that temperature is 1000 DEG C ~ 1350 DEG C, temperature retention time is rolled under being the condition of 5min ~ 60min, obtain rolled piece; Rolled piece being placed on temperature is in the heating furnace of 1000 DEG C ~ 1350 DEG C again, turns off the power supply of heating furnace, treats that rolled piece naturally cools to 100 DEG C ~ 600 DEG C, then is taken out from heating furnace by rolled piece, naturally cool to room temperature, obtain the rolled piece being surrounded by jacket;
Seven, jacket is removed:
Adopt the jacket be surrounded by the rolled piece of jacket obtained in machining process removal step six, obtain TiAl/Ti alloy stratiform composite board.
The prefabricated slab of TiAl alloy of present embodiment and pure titanium or the prefabricated slab of titanium alloy stack and refer to: using prefabricated for TiAl alloy slab as ground floor, then by pure titanium or the prefabricated slab of titanium alloy placed on it, as the second layer, stack the prefabricated slab of TiAl alloy on the second layer as third layer, by that analogy, stack into the prefabricated slab of TiAl alloy/pure titanium or the prefabricated slab of the prefabricated slab/TiAl alloy of titanium alloy ... the slab of the prefabricated slab of ../TiAl alloy, wherein, TiAl alloy has n+1 layer, and pure titanium or titanium alloy have n layer (n is the integer of 1 ~ 50).
Present embodiment adopt discharge plasma sintering technique collection powder forming and be sintered in one, do not need preshaped, without any need for additive and binding agent yet.Its homogeneous heating, quick heating, sintering temperature are low, sintering time is short, efficiency is high, fine microstructures is even, protect raw-material nature, can obtain the material of high-compactness, are conducive to the post forming of sheet material.Be conducive to preparing large scale, high strength, the TiAl/Ti alloy laminar composite of high-ductility.
Present embodiment is by placing introduce titanium alloy as toughness reinforcing phase by the prefabricated slab of TiAl alloy of preparation and pure titanium or titanium alloy prefabricated slab alternative stacked, be conducive to the two compatible deformation, be conducive to preparing high strength, the TiAl/Ti alloy laminar composite of high-ductility.
The composite board that present embodiment obtains is of a size of 230mm × 80mm × 1.2mm, and room temperature tensile intensity can reach 1200MPa, and temperature-room type plasticity is 4 ~ 5%.700 DEG C of tensile strength can reach 900MPa, and 700 DEG C of plasticity are 10 ~ 15%.
Detailed description of the invention two: present embodiment and detailed description of the invention one are one or more mix in Mo, Cr, Nb, V, W, Fe and Mn unlike: beta phase stable element.Other is identical with detailed description of the invention one.
Detailed description of the invention three: present embodiment and detailed description of the invention one are that one or more in B, C and Y mix unlike: micro alloying element.Other is identical with detailed description of the invention one.
Detailed description of the invention four: present embodiment and detailed description of the invention one are room temperature unlike the temperature of the vacuum outgas described in: step 2 and step 3, and vacuum is 0.1 ~ 1Pa.Other is identical with detailed description of the invention one.
Detailed description of the invention five: present embodiment and detailed description of the invention one are room temperature unlike the temperature of the vacuum outgas described in: step 2 and step 3, and vacuum is 0.5 ~ 1Pa.Other is identical with detailed description of the invention one.
Detailed description of the invention six: present embodiment and detailed description of the invention one are 20 DEG C/min ~ 200 DEG C/min unlike the heating rate of the discharge plasma sintering described in: step 2 and step 3.Other is identical with detailed description of the invention one.
Detailed description of the invention seven: present embodiment and detailed description of the invention one are 30 DEG C/min ~ 200 DEG C/min unlike the heating rate of the discharge plasma sintering described in: step 2 and step 3.Other is identical with detailed description of the invention one.
Detailed description of the invention eight: present embodiment and detailed description of the invention one are 30 DEG C/min ~ 150 DEG C/min unlike the heating rate of the discharge plasma sintering described in: step 2 and step 3.Other is identical with detailed description of the invention one.
Detailed description of the invention nine: present embodiment and detailed description of the invention one are 30 DEG C/min ~ 120 DEG C/min unlike the heating rate of the discharge plasma sintering described in: step 2 and step 3.Other is identical with detailed description of the invention one.
Detailed description of the invention ten: present embodiment and detailed description of the invention one are 30 DEG C/min ~ 100 DEG C/min unlike the heating rate of the discharge plasma sintering described in: step 2 and step 3.Other is identical with detailed description of the invention one.
Detailed description of the invention 11: present embodiment and detailed description of the invention one are 30 DEG C/min ~ 80 DEG C/min unlike the heating rate of the discharge plasma sintering described in: step 2 and step 3.Other is identical with detailed description of the invention one.
Detailed description of the invention 12: present embodiment and detailed description of the invention one are 30 DEG C/min ~ 60 DEG C/min unlike the heating rate of the discharge plasma sintering described in: step 2 and step 3.Other is identical with detailed description of the invention one.
Detailed description of the invention 13: present embodiment and detailed description of the invention one are 1000 DEG C ~ 1400 DEG C unlike the temperature of the discharge plasma sintering described in: step 2 and step 3, pressure is 30MPa ~ 100MPa, temperature retention time is 2min ~ 120min, cools after insulation with stove.Other is identical with detailed description of the invention one.
Detailed description of the invention 14: present embodiment and detailed description of the invention one are 1000 DEG C ~ 1300 DEG C unlike the temperature of the discharge plasma sintering described in: step 2 and step 3, pressure is 40MPa ~ 100MPa, temperature retention time is 2min ~ 100min, cools after insulation with stove.Other is identical with detailed description of the invention one.
Detailed description of the invention 15: present embodiment and detailed description of the invention one are 1000 DEG C ~ 1200 DEG C unlike the temperature of the discharge plasma sintering described in: step 2 and step 3, pressure is 40MPa ~ 80MPa, temperature retention time is 2min ~ 80min, cools after insulation with stove.Other is identical with detailed description of the invention one.
Detailed description of the invention 16: present embodiment and detailed description of the invention one are 1000 DEG C ~ 1200 DEG C unlike the temperature of the discharge plasma sintering described in: step 2 and step 3, pressure is 40MPa ~ 80MPa, temperature retention time is 2min ~ 60min, cools after insulation with stove.Other is identical with detailed description of the invention one.
Detailed description of the invention 17: present embodiment and detailed description of the invention one are 1000 DEG C ~ 1100 DEG C unlike the temperature of the discharge plasma sintering described in: step 2 and step 3, pressure is 40MPa ~ 80MPa, temperature retention time is 2min ~ 60min, cools after insulation with stove.Other is identical with detailed description of the invention one.
Detailed description of the invention 18: present embodiment and detailed description of the invention one unlike: the high temperature pack rolling described in step 6 is that the jacket after soldering and sealing step 5 obtained puts into heating furnace, again by heating furnace from room temperature to 1000 DEG C ~ 1350 DEG C, 5min ~ 100min is incubated again at temperature is 1000 DEG C ~ 1350 DEG C, again jacket is placed on milling train, be 0.05m/s ~ 2.5m/s in rolling speed, pass deformation is 5% ~ 40%, rolling total deformation be 30% ~ 90% and passage to melt down temperature be 1000 DEG C ~ 1350 DEG C, temperature retention time is be rolled under the condition of 5min ~ 50min, obtain rolled piece, rolled piece being placed on temperature is in the heating furnace of 1000 DEG C ~ 1350 DEG C again, turns off the power supply of heating furnace, treats that rolled piece naturally cools to 120 DEG C ~ 600 DEG C, then is taken out from heating furnace by rolled piece, naturally cool to room temperature, obtain the rolled piece being surrounded by jacket.Other is identical with detailed description of the invention one.
Detailed description of the invention 19: present embodiment and detailed description of the invention one unlike: the high temperature pack rolling described in step 6 is that the jacket after soldering and sealing step 5 obtained puts into heating furnace, again by heating furnace from room temperature to 1000 DEG C ~ 1350 DEG C, 5min ~ 80min is incubated again at temperature is 1000 DEG C ~ 1350 DEG C, again jacket is placed on milling train, be 0.1m/s ~ 2.5m/s in rolling speed, pass deformation is 5% ~ 40%, rolling total deformation be 30% ~ 90% and passage to melt down temperature be 1000 DEG C ~ 1350 DEG C, temperature retention time is be rolled under the condition of 5min ~ 45min, obtain rolled piece, rolled piece being placed on temperature is in the heating furnace of 1000 DEG C ~ 1350 DEG C again, turns off the power supply of heating furnace, treats that rolled piece naturally cools to 150 DEG C ~ 600 DEG C, then is taken out from heating furnace by rolled piece, naturally cool to room temperature, obtain the rolled piece being surrounded by jacket.Other is identical with detailed description of the invention one.
Detailed description of the invention 20: present embodiment and detailed description of the invention one unlike: the high temperature pack rolling described in step 6 is that the jacket after soldering and sealing step 5 obtained puts into heating furnace, again by heating furnace from room temperature to 1000 DEG C ~ 1350 DEG C, 5min ~ 75min is incubated again at temperature is 1000 DEG C ~ 1350 DEG C, again jacket is placed on milling train, be 0.1m/s ~ 2.5m/s in rolling speed, pass deformation is 5% ~ 40%, rolling total deformation be 30% ~ 90% and passage to melt down temperature be 1000 DEG C ~ 1350 DEG C, temperature retention time is be rolled under the condition of 5min ~ 40min, obtain rolled piece, rolled piece being placed on temperature is in the heating furnace of 1000 DEG C ~ 1350 DEG C again, turns off the power supply of heating furnace, treats that rolled piece naturally cools to 180 DEG C ~ 600 DEG C, then is taken out from heating furnace by rolled piece, naturally cool to room temperature, obtain the rolled piece being surrounded by jacket.Other is identical with detailed description of the invention one.
Detailed description of the invention 21: present embodiment and detailed description of the invention one unlike: the high temperature pack rolling described in step 6 is that the jacket after soldering and sealing step 5 obtained puts into heating furnace, again by heating furnace from room temperature to 1000 DEG C ~ 1350 DEG C, 5min ~ 70min is incubated again at temperature is 1000 DEG C ~ 1350 DEG C, again jacket is placed on milling train, be 0.1m/s ~ 2.5m/s in rolling speed, pass deformation is 5% ~ 40%, rolling total deformation be 30% ~ 90% and passage to melt down temperature be 1000 DEG C ~ 1350 DEG C, temperature retention time is be rolled under the condition of 5min ~ 40min, obtain rolled piece, rolled piece being placed on temperature is in the heating furnace of 1000 DEG C ~ 1350 DEG C again, turns off the power supply of heating furnace, treats that rolled piece naturally cools to 200 DEG C ~ 600 DEG C, then is taken out from heating furnace by rolled piece, naturally cool to room temperature, obtain the rolled piece being surrounded by jacket.Other is identical with detailed description of the invention one.
Content of the present invention is not limited only to the content of the respective embodiments described above, and the combination of one of them or several detailed description of the invention equally also can realize the object of inventing.
Beneficial effect of the present invention is verified by following examples:
Embodiment 1
The sheet material that the TiAl intermetallic compound-titanium alloy composite panel material of the present embodiment is metallic compound sheet material and two-layer titanium alloy between TiAl by three-layer-material forms, and between TiAl, metallic compound is on both sides.
A kind of powder metallurgy of the present embodiment prepares the method for TiAl/Ti alloy stratiform composite board, and it completes according to the following steps:
One, with misted deposition method, to prepare particle diameter be the nominal composition of 0.5 μm ~ 100 μm be the TiAl prealloy powder of Ti-43Al-9V-0.3Y and nominal composition is the prealloy powder of Ti-6Al-4V;
Two, be that crystal vessel put into by the TiAl prealloy powder of Ti-43Al-9V-0.3Y by the nominal composition prepared, be evacuated to 0.09Pa; Then with the firing rate of 30 DEG C/min, sintering temperature is risen to 1260 DEG C, and carry out pressure sintering under the pressure of 60MPa, after stove inside holding 50min, with stove cooling, obtain the prefabricated slab of Ti-43Al-9V-0.3Y that density is 99.9%;
Three, be then that crystal vessel put into by the prealloy powder of Ti-6Al-4V by nominal composition, be evacuated to 0.4Pa, then with the firing rate of 35 DEG C/min, sintering temperature is risen to 1200 DEG C, and pressure sintering is carried out under the pressure of 45MPa, after stove inside holding 45min, with stove cooling, obtain the prefabricated slab of Ti-6Al-4V that density is 99.7%;
Four, prefabricated for Ti-43Al-9V-0.3Y slab and the prefabricated slab line of Ti-6Al-4V are cut and rounding, obtain surface smoothness and be Ra6, size is the preform of 100mm × 65mm × 2mm; Preform is alternately put into stainless steel jacket, then it is airtight to carry out welding; Described preform is alternately put into and is referred to: be stacked alternately the prefabricated slab of Ti-43Al-9V-0.3Y and the prefabricated slab to 5 layer of Ti-6Al-4V in the mode of the prefabricated slab of the prefabricated slab/Ti-6Al-4V of Ti-43Al-9V-0.3Y, obtain final stacking slab; The both sides of final stacking slab are the prefabricated slab of Ti-43Al-9V-0.3Y;
Five, rolling: the preform being surrounded by jacket is put into heating furnace, again by heating furnace from room temperature to 1250 DEG C, 60min is incubated again at temperature is 1250 DEG C, be that the jacket being surrounded by preform after 1250 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 80% and passage to melt down temperature be at 1250 DEG C, be rolled under the condition of insulation 10min, obtain rolled piece;
Six, rolled piece being placed on temperature is in the heating furnace of 1250 DEG C, then turns off the power supply of heating furnace, and rolled piece naturally cools to 350 DEG C, then is that 350 DEG C of rolled pieces take out from heating furnace by temperature, naturally cools to room temperature, obtains the jacket rolled piece being surrounded by prefabricated slab;
Seven, adopt machining process to remove jacket, obtain metallic compound between TiAl-titanium alloy stratiform composite board.
The composite board that the present embodiment obtains is of a size of 230mm × 80mm × 1.2mm, and room temperature tensile intensity is 930MPa, and temperature-room type plasticity is 4.5%.700 DEG C of tensile strength are 750MPa, and 700 DEG C of plasticity are 15.2%.
Embodiment 2
The sheet material that the TiAl intermetallic compound-titanium alloy composite panel material of the present embodiment is metallic compound sheet material and three layers of titanium alloy between TiAl by four layers of material forms, and between TiAl, metallic compound is on both sides.
A kind of powder metallurgy of the present embodiment prepares the method for TiAl/Ti alloy stratiform composite board, and it completes according to the following steps:
One, with misted deposition method, to prepare particle diameter be the nominal composition of 0.5 μm ~ 100 μm be the TiAl prealloy powder of Ti-44Al-8Nb-0.2W-0.2B-Y and nominal composition is the prealloy powder of Ti-6Al-4V;
Two, be that crystal vessel put into by the TiAl prealloy powder of Ti-44Al-8Nb-0.2W-0.2B-Y by the nominal composition prepared, be evacuated to 0.1Pa.Then with the firing rate of 40 DEG C/min, sintering temperature is risen to 1280 DEG C, and carry out pressure sintering under the pressure of 55MPa, after stove inside holding 30min, with stove cooling, obtain the prefabricated slab of Ti-44Al-8Nb-0.2W-0.2B-Y that density is 99.8%;
Three, be that crystal vessel put into by the prealloy powder of Ti-6Al-4V by nominal composition, be evacuated to 0.2Pa, then with the firing rate of 45 DEG C/min, sintering temperature is risen to 1220 DEG C, and pressure sintering is carried out under the pressure of 50MPa, after stove inside holding 35min, with stove cooling, obtain the prefabricated slab of Ti-6Al-4V that density is 99.9%;
Four, prefabricated for Ti-44Al-8Nb-0.2W-0.2B-Y slab and the prefabricated slab of Ti-6Al-4V are carried out Linear cut and rounding, obtain surface smoothness and be Ra8, size is the preform of 100mm × 65mm × 2.2mm; Preform is alternately put into stainless steel jacket, then it is airtight to carry out welding; Described preform is alternately put into and is referred to: be stacked alternately the prefabricated slab of Ti-44Al-8Nb-0.2W-0.2B-Y and the prefabricated slab to 7 layer of Ti-6Al-4V in the mode of the prefabricated slab of the prefabricated slab/Ti-6Al-4V of Ti-44Al-8Nb-0.2W-0.2B-Y, obtain final stacking slab; The both sides of final stacking slab are the prefabricated slab of Ti-44Al-8Nb-0.2W-0.2B-Y;
Five, rolling: the preform being surrounded by jacket is put into heating furnace, again by heating furnace from room temperature to 1240 DEG C, 50min is incubated again at temperature is 1240 DEG C, be that the jacket being surrounded by preform after 1240 DEG C of soldering and sealing is placed on milling train again by temperature, be 0.25m/s in rolling speed, pass deformation is 79%, rolling total deformation be 80% and passage to melt down temperature be at 1240 DEG C, be rolled under the condition of insulation 13min, obtain rolled piece; Rolled piece being placed on temperature is in the heating furnace of 1240 DEG C again, then turns off the power supply of heating furnace, and rolled piece naturally cools to 290 DEG C, then is that 290 DEG C of rolled pieces take out from heating furnace by temperature, naturally cools to room temperature, obtains the jacket rolled piece being surrounded by prefabricated slab;
Six, adopt machining process to remove jacket, obtain metallic compound between TiAl-titanium alloy stratiform composite board.
The composite board that the present embodiment obtains is of a size of 230mm × 80mm × 1.4mm, and room temperature tensile intensity is 950MPa, and temperature-room type plasticity is 4.4%.700 DEG C of tensile strength are 780MPa, and 700 DEG C of plasticity are 15.6%.
Claims (10)
1. powder metallurgy prepares a method for TiAl/Ti alloy stratiform composite board, it is characterized in that it completes according to the following steps:
One, raw material prepare: to take particle diameter be the nominal chemical composition of 0.5 μm ~ 250 μm is the TiAl prealloy powder of Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 2) Z (at%), takes pure titanium or titanium alloy prealloy powder that particle diameter is 0.5 μm ~ 250 μm;
Wherein, X is beta phase stable element, and Z is micro alloying element;
Described nominal chemical composition is that the TiAl pre-alloyed powder of Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 2) Z (at%) is prepared by inert gas atomizer method or rotating electrode atomized method;
Described pure titanium or titanium alloy pre-alloyed powder are prepared by inert gas atomizer method or rotating electrode atomized method;
Two, discharge plasma sintering: the TiAl pre-alloyed powder of to be the nominal chemical composition of 0.5 μm ~ 250 μm by the particle diameter taken in step one be Ti-(40 ~ 44.5) Al-(0.5 ~ 10) X-(0.1 ~ 2) Z (at%) puts into crystal vessel, vacuum outgas, carry out discharge plasma sintering, obtain the TiAl alloy slab that density is 95% ~ 100%;
Three, be that the pure titanium of 0.5 μm ~ 250 μm or titanium alloy prealloy powder put into crystal vessel, vacuum outgas by the particle diameter taken in step one, carry out discharge plasma sintering, obtain pure titanium or titanium alloy slab that density is 95% ~ 100%;
The temperature of step 2 and the vacuum outgas described in step 3 is room temperature, and vacuum is 0.01 ~ 1Pa;
The heating rate of step 2 and the discharge plasma sintering described in step 3 is 10 DEG C/min ~ 200 DEG C/min;
The temperature of step 2 and the discharge plasma sintering described in step 3 is 900 DEG C ~ 1400 DEG C, and pressure is 5MPa ~ 100MPa, and temperature retention time is 2min ~ 180min, cools after insulation with stove;
Four, cutting processing: the TiAl alloy slab obtained and pure titanium or titanium alloy slab are carried out Linear cut and rounding, obtains that surface smoothness is Ra6 ~ Ra8, length and width are (10 ~ 200) mm × (10 ~ 200) mm and thickness is the prefabricated slab of TiAl alloy of 0.3 ~ 30mm and pure titanium or the prefabricated slab of titanium alloy;
Five, jacket: prefabricated for TiAl alloy in step 4 slab and pure titanium or the prefabricated slab of titanium alloy are stacked; The mode of stacking is: be stacked alternately the prefabricated slab of TiAl alloy and pure titanium or the prefabricated slab of titanium alloy to 2n+1 layer in the mode of the prefabricated slab of TiAl alloy/pure titanium or the prefabricated slab of titanium alloy, obtain final stacking slab; Wherein, n is the integer of 1 ~ 50; The both sides of final stacking slab are the prefabricated slab of TiAl alloy;
Final stacking slab is placed in jacket, then carries out sealing;
Six, high temperature pack rolling: the jacket after soldering and sealing step 5 obtained puts into heating furnace, again by heating furnace from room temperature to 1000 DEG C ~ 1350 DEG C, 5min ~ 120min is incubated again at temperature is 1000 DEG C ~ 1350 DEG C, again jacket is placed on milling train, rolling speed be 0.01m/s ~ 2.5m/s, pass deformation is 5% ~ 40%, rolling total deformation be 30% ~ 90% and passage melt down that temperature is 1000 DEG C ~ 1350 DEG C, temperature retention time is rolled under being the condition of 5min ~ 60min, obtain rolled piece; Rolled piece being placed on temperature is in the heating furnace of 1000 DEG C ~ 1350 DEG C again, turns off the power supply of heating furnace, treats that rolled piece naturally cools to 100 DEG C ~ 600 DEG C, then is taken out from heating furnace by rolled piece, naturally cool to room temperature, obtain the rolled piece being surrounded by jacket;
Seven, jacket is removed:
Adopt the jacket be surrounded by the rolled piece of jacket obtained in machining process removal step six, obtain TiAl/Ti alloy stratiform composite board.
2. a kind of powder metallurgy according to claim 1 prepares the method for TiAl/Ti alloy stratiform composite board, it is characterized in that beta phase stable element is the mixing of one or more in Mo, Cr, Nb, V, W, Fe and Mn.
3. a kind of powder metallurgy according to claim 1 prepares the method for TiAl/Ti alloy stratiform composite board, it is characterized in that micro alloying element is one or more mixing in B, C and Y.
4. a kind of powder metallurgy according to claim 1 prepares the method for TiAl/Ti alloy stratiform composite board, and it is characterized in that the temperature of the vacuum outgas described in step 2 and step 3 is room temperature, vacuum is 0.05 ~ 1Pa.
5. a kind of powder metallurgy according to claim 1 prepares the method for TiAl/Ti alloy stratiform composite board, it is characterized in that the heating rate of the discharge plasma sintering described in step 2 and step 3 is 20 DEG C/min ~ 200 DEG C/min.
6. a kind of powder metallurgy according to claim 1 prepares the method for TiAl/Ti alloy stratiform composite board, it is characterized in that the temperature of the discharge plasma sintering described in step 2 and step 3 is 1000 DEG C ~ 1400 DEG C, pressure is 30MPa ~ 100MPa, temperature retention time is 2min ~ 120min, cools after insulation with stove.
7. a kind of powder metallurgy according to claim 1 prepares the method for TiAl/Ti alloy stratiform composite board, it is characterized in that described jacket is stainless steel, pure titanium or titanium alloy.
8. a kind of powder metallurgy according to claim 1 prepares the method for TiAl/Ti alloy stratiform composite board, the high temperature pack rolling that it is characterized in that described in step 6 is that the jacket after soldering and sealing step 5 obtained puts into heating furnace, again by heating furnace from room temperature to 1000 DEG C ~ 1350 DEG C, 5min ~ 100min is incubated again at temperature is 1000 DEG C ~ 1350 DEG C, again jacket is placed on milling train, be 0.05m/s ~ 2.5m/s in rolling speed, pass deformation is 5% ~ 40%, rolling total deformation be 30% ~ 90% and passage to melt down temperature be 1000 DEG C ~ 1350 DEG C, temperature retention time is be rolled under the condition of 5min ~ 50min, obtain rolled piece, rolled piece being placed on temperature is in the heating furnace of 1000 DEG C ~ 1350 DEG C again, turns off the power supply of heating furnace, treats that rolled piece naturally cools to 120 DEG C ~ 600 DEG C, then is taken out from heating furnace by rolled piece, naturally cool to room temperature, obtain the rolled piece being surrounded by jacket.
9. a kind of powder metallurgy according to claim 8 prepares the method for TiAl/Ti alloy stratiform composite board, the high temperature pack rolling that it is characterized in that described in step 6 is that the jacket after soldering and sealing step 5 obtained puts into heating furnace, again by heating furnace from room temperature to 1000 DEG C ~ 1350 DEG C, 5min ~ 80min is incubated again at temperature is 1000 DEG C ~ 1350 DEG C, again jacket is placed on milling train, be 0.1m/s ~ 2.5m/s in rolling speed, pass deformation is 5% ~ 40%, rolling total deformation be 30% ~ 90% and passage to melt down temperature be 1000 DEG C ~ 1350 DEG C, temperature retention time is be rolled under the condition of 5min ~ 45min, obtain rolled piece, rolled piece being placed on temperature is in the heating furnace of 1000 DEG C ~ 1350 DEG C again, turns off the power supply of heating furnace, treats that rolled piece naturally cools to 150 DEG C ~ 600 DEG C, then is taken out from heating furnace by rolled piece, naturally cool to room temperature, obtain the rolled piece being surrounded by jacket.
10. a kind of powder metallurgy according to claim 9 prepares the method for TiAl/Ti alloy stratiform composite board, the high temperature pack rolling that it is characterized in that described in step 6 is that the jacket after soldering and sealing step 5 obtained puts into heating furnace, again by heating furnace from room temperature to 1000 DEG C ~ 1350 DEG C, 5min ~ 75min is incubated again at temperature is 1000 DEG C ~ 1350 DEG C, again jacket is placed on milling train, be 0.1m/s ~ 2.5m/s in rolling speed, pass deformation is 5% ~ 40%, rolling total deformation be 30% ~ 90% and passage to melt down temperature be 1000 DEG C ~ 1350 DEG C, temperature retention time is be rolled under the condition of 5min ~ 40min, obtain rolled piece, rolled piece being placed on temperature is in the heating furnace of 1000 DEG C ~ 1350 DEG C again, turns off the power supply of heating furnace, treats that rolled piece naturally cools to 180 DEG C ~ 600 DEG C, then is taken out from heating furnace by rolled piece, naturally cool to room temperature, obtain the rolled piece being surrounded by jacket.
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