CN102896267B - Isothermal forging method of TC17 titanium alloy disc-shaped forge piece - Google Patents
Isothermal forging method of TC17 titanium alloy disc-shaped forge piece Download PDFInfo
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Abstract
The invention relates to a forging method of a titanium alloy disc-shaped forge piece and particularly relates to an isothermal forging method of a TC17 titanium alloy disc-shaped forge piece. The method includes heating a titanium alloy rod ingot to the temperature which is smaller than a transformation temperature by 40 DEG C-50 DEGC, heating an upper flat die and a lower flat die to a temperature which is smaller than the transformation temperature by 40 DEG C-50 DEGC, and enabling the upper flat die to move downwards so that the rod ingot is subjected to first isothermal upsetting to form a primary biscuit at the strain rate of 0.001s<-1>-0.01s<-1> and then to second isothermal upsetting to form a secondary biscuit at the strain rate of 0.001s<-1>-0.01s<-1>, and the deformation amount is 30%-50%; heating the secondary biscuit to the temperature which is smaller than the transformation temperature by 20 DEG C-30 DEGC, heating an upper cavity die and a lower cavity die to the temperature which is smaller than the transformation temperature by 20 DEG C-30 DEGC, and forging the secondary biscuit by using a pressing machine so that the upper cavity die and the lower cavity die are molded to a forge piece under the conditions that the strain rate is 0.001s<-1>-0.01s<-1> and the deformation amount reaches 30%-50% in the cavity dies; and subjecting the forge piece to heat treatment after forging, wherein the heat treatment includes solid solution treatment and aging treatment. According to the method, the disc-shaped forge piece forged by the method is provided with ideal equiaxed structures and high performances, and the method is suitable for manufacturing forge pieces of compressor disks and turbine disks of aero-engines.
Description
Technical field
The present invention relates to a kind of forging method of titanium alloy disk forge piece, particularly a kind of isothermal forging method of TC17 titanium alloy disk forge piece.
Background technology
The characteristic such as it is anticorrosive that titanium alloy has that intensity is high, quality is light and good, important application is had in Aeronautics and Astronautics field, especially the diskware such as compressor disc, the turbine disk of aero-engine is due to work under bad environment, stressed complexity, often adopts the type alpha+beta diphasic titanium alloy forging and molding of excellent combination property.Adopt the series of advantages such as diskware has high strength, fracture toughness is good, quenching degree is high and forging range is wide of type alpha+beta diphasic titanium alloy forging, the loss needs of tolerance design and the requirement of high structure, high reliability and low manufacturing cost can be met.The change of microscopic structure is comparatively remarkable to mechanical impact, and above-mentioned Good All-around Property must ensure by desirable forging microstructure.
One section of Isothermal Forging Technology of Titanium Alloy Blisk article by name stepped on by " Shanghai steel grinds " 02 periodical in 2006, this article is studied the forging drawing of TC17 alloy monolithic leaf dish, the shape of rough forging and mould structure and isothermal forging process, and produces whole titanium alloy leaf dish Isothermal Forging by isothermal forging process.Be same class material diskware isothermal forging described in TC17 diskware isothermal forging described in this article and this patent, but this article is not described the forming process of described forging.No forming process has different effects and economic benefit.
In the research of alpha and beta type titan alloy forging, because thermal deformation technique difference can obtain the microscopic structure of Four types, along with the requirement more and more higher to engine performance, properties design objective improves constantly, many research work are put into and are obtained basket tissue, CN1403622A discloses a kind of titanium alloy quasi-beta forging process, when adopting this technique to carry out accurate β forging to alpha and beta type titan alloy, that titanium alloy blank is heated to region near beta transformation point temperature, namely below phase point temperature, the scope of more than 10 DEG C to phase point temperature 10 DEG C is forged, when heating in this region, due to the cooling of blank after coming out of the stove, the distortion of forging is actually to be carried out in alpha+beta district, the primary alpha phase of this basket tissue is within 15.But the method is forged by hot forging, can not effective controlled forge process deformation temperature, therefore stability be there is no to the control of forging tissue.
Patent CN101804441A " near isothermal forging method of TC17 two-phase titanium alloy disk forge piece ", the method adopts " low-Gao-low " technique base, namely TC17 titanium alloy bar ingot is heated to below transformation temperature 30 DEG C ~ 75 DEG C, jumping-up; Be heated to more than transformation temperature 20 DEG C ~ 60 DEG C again, pulling; Be heated to below transformation temperature 30 DEG C ~ 75 DEG C again, the circular material blank of α isometry distribution is obtained after jumping-up punching, again circular material blank is heated to more than transformation temperature 20 DEG C ~ 60 DEG C, after forging die is heated to below transformation temperature 10 DEG C ~ 20 DEG C, prepares the forging of the basket tissue of the whole network.Although the method is also the forging method of TC17 titanium alloy disk forge piece, what prepare is the forging of the basket tissue of the whole network, and to obtain the forging of bifurcation tissue, the party's rule can not realize.
Summary of the invention
The technical problem to be solved in the present invention is to provide and a kind ofly makes disk forge piece internal microstructure be axle α phase such as content about 20% grade and the isothermal forging method of the TC17 titanium alloy disk forge piece of equally distributed bifurcation tissue.Technical solution of the present invention is,
TC17 titanium alloy rod bar is cutting into excellent ingot by specification, heats 40 DEG C ~ 50 DEG C, below this excellent ingot to alloy phase height, be incubated by this excellent ingot effective thickness 0.6 ~ 1min/mm; After heating below upper and lower flat-die to transformation temperature 40 DEG C ~ 50 DEG C, described excellent ingot is loaded flat-die, press forges and presses excellent ingot makes it with 0.001s
-1~ 0.01s
-1strain rate reach 30% ~ 50% in flat-die internal strain amount and be configured as a biscuit, in flat-die, take out a biscuit, melt down heating and thermal insulation while hot;
Melt down temperature retention time to calculate by after temperature, temperature retention time reduces by half by first time temperature retention time; After insulation terminates, again a biscuit is loaded flat-die and carry out the second fire time jumping-up, press forges and presses a biscuit makes it with 0.001s
-1~ 0.01s
-1strain rate reach 30% ~ 50% in flat-die internal strain amount and be configured as secondary biscuit, in flat-die, take out secondary biscuit air cooling;
Heat above-mentioned secondary biscuit below transformation temperature 20 DEG C ~ 30 DEG C, be incubated by this secondary biscuit effective thickness 0.6 ~ 1min/mm; After heating below upper and lower swaging die to transformation temperature 20 DEG C ~ 30 DEG C, secondary biscuit is loaded swaging die, press forging and stamping secondary biscuit makes it with 0.001s
-1~ 0.01s
-1strain rate reach 30% ~ 50% postforming forging in swaging die internal strain amount, in swaging die, take out forging air cooling;
Heat-treat forging after forging, after forging, forging is heat-treated, its heat treating regime for being 780 DEG C ~ 820 DEG C × 4 hours, water-cooled; 590 DEG C ~ 650 DEG C × 8 hours, air cooling.
Described forging heat treating regime is 800 DEG C ± 10 DEG C × 4 hours, water-cooled; 620 DEG C ± 10 DEG C × 8 hours, air cooling.
For convenience of delivery, at its surface spraying glass lubricant after described excellent ingot and biscuit are first preheating to 200 DEG C ~ 300 DEG C before heating is die-filling; Described flat-die and swaging die before described excellent ingot is die-filling at mould surface spraying glass lubricant.
Compared with prior art, beneficial effect of the present invention is as follows:
The present invention adopts excellent ingot two fire time isothermal upset forging process base, namely TC17 titanium alloy bar ingot is heated to below transformation temperature 40 DEG C ~ 50 DEG C, after flat-die is heated to below transformation temperature 40 DEG C ~ 50 DEG C, makes excellent ingot in flat-die with strain rate 0.001s
-1~ 0.01s
-1in scope, deflection reaches in 30% ~ 50% scope and carries out two fire time jumping-ups, ensures that excellent ingot carries out in two-phase section, obtains the tiny and biscuit waiting axle α tissue be evenly distributed, for follow-up forging forming lays the foundation.
Biscuit is heated to below transformation temperature 20 DEG C ~ 30 DEG C, after swaging die is heated to below transformation temperature 20 DEG C ~ 30 DEG C, makes biscuit in swaging die with strain rate 0.001s
-1~ 0.01s
-1scope is interior, deflection reaches 30% ~ 50% scope internal shaping forging, ensures that forging stock carries out in two-phase section, obtains the bifurcation tissue that equiaxial alpha content is about 20%, thus obtains best fracture toughness and the coupling of plasticity, the needs of fully satisfied loss tolerance design.
Advantage of the present invention is the alpha+beta two-phase forging district isothermal forging by routine, i.e. isothermal jumping-up+isothermal die forging process, resistance of deformation is little, easy shaping, good stability, yield rate are high, and time open die forging of fire more than avoiding in current technology changes high cost, long period that forging base brings, considerably increases economic benefit while meeting design requirement.
Adopt the forging of the method forging after heat treatment to have comparatively ideal combination property, and realize 150mm thick forging ultrasound examination noise level and meet 0.8-12DB requirement.
Accompanying drawing explanation
Fig. 1 is that titanium alloy two fire time isothermal jumping-up base and a fire time isothermal forging cause shape disk forge piece process chart.
Fig. 2 adopts TC17 Isothermal Forging of Titanium Alloy to become the shape Forging centrally metallographic structure photo of R/2 position, longitudinal section cut open of line.
Detailed description of the invention
Type alpha+beta diphasic titanium alloy, such as: the Chinese material trade mark is the titanium alloy of TC17.
Shown below is the near isothermal forging processing step of TC17 titanium alloy:
Step 1: detecting the TC17 titanium alloy material phase point temperature adopted is 895 DEG C.
Step 2: as shown in Figure 1, TC17 titanium alloy circular bar is cutting into excellent ingot 1 by forging specification, at its surface spraying lubricant agent special after excellent ingot 1 is preheating to 300 DEG C, again this excellent ingot 1 is put in forge furnace and is heated to below titanium alloy transformation temperature 855 DEG C, insulation, temperature retention time calculates by excellent ingot effective thickness 0.6min/mm.
Step 3: upper flat-die 2 and lower flat-die 3 are heated to below this titanium alloy transformation temperature 855 DEG C, to convenient when delivery, can at the surface spraying glass lubricant of upper flat-die 2 and lower flat-die 3, heated by the ring mould heating furnace 8 be arranged on forging press during heating, again the excellent ingot 1 after heating through step 1 is loaded flat-die, isothermal is carried out to excellent ingot 1 be upset as a biscuit 4 by upper flat-die is descending.One time biscuit 4 melts down while hot.The deflection of a biscuit 4 is the forging strain rate of 33%, biscuit 4 in forging and stamping process is 0.001s
- 1~ 0.01s
-1.
Step 4: the above-mentioned biscuit 4 melted down while hot is heated to below this titanium alloy transformation temperature 855 DEG C, insulation, temperature retention time reduces by half by the temperature retention time of step 2.
Step 5: take out a biscuit 4 in forge furnace, is put into and forging press carries out the second fire time jumping-up again and obtain secondary biscuit 5, air cooling after forging.The deflection of secondary biscuit 5 is 36%, and the forging strain rate of secondary biscuit 5 in forging and stamping process is 0.001s
-1~ 0.01s
-1.
Step 6: at its surface spraying glass lubricant after secondary biscuit 5 is preheating to 300 DEG C, then this biscuit is heated to below this titanium alloy transformation temperature 865 DEG C, insulation, temperature retention time calculates by this biscuit effective thickness 0.6min/mm.
Step 7: upper impression mould 6 and lower impressions mould 7 are heated to below this titanium alloy transformation temperature 865 DEG C, to convenient when delivery, can at the surface spraying glass lubricant of upper impression mould 6 and lower impressions mould 7, heated by the ring mould heating furnace 8 be arranged on forging press during heating, again the biscuit 5 after heating through step 5 is loaded swaging die, applying pressure by forging press makes upper impression mould 6 descending, also a fire is secondary to biscuit 5 excellent suitability for press forming forging 9 with lower impressions mould 7 matched moulds, forging 9 depanning air cooling.The deflection of forging 9 is 33%, and the forging strain rate of forging 9 in forging and stamping process is 0.001s
-1~ 0.01s
-1.
Step 8: forging 9 is heat-treated, i.e. solid solution+Ageing Treatment, wherein solution treatment is that forging 9 is heated to 800 DEG C ± 10 DEG C, puts into water and cool (shrend) rapidly after insulation 4h; Ageing Treatment is that the forging 9 after solution treatment is heated to 620 DEG C ± 10 DEG C, and the laggard line space of insulation 8h is cold.
Claims (4)
1. an isothermal forging method for TC17 titanium alloy disk forge piece, is characterized in that, comprises the following steps:
TC17 titanium alloy rod bar is cutting into excellent ingot by specification, heats 40 DEG C ~ 50 DEG C, below this excellent ingot to alloy phase height, be incubated by this excellent ingot effective thickness 0.6 ~ 1min/mm;
After heating below upper and lower flat-die to transformation temperature 40 DEG C ~ 50 DEG C, described excellent ingot is put into flat-die, press forges and presses excellent ingot makes it with 0.001s
-1~ 0.01s
-1strain rate after flat-die internal strain amount reaches 30% ~ 50%, obtain a biscuit, take out melt down while hot;
A biscuit melts down temperature retention time while hot and calculates after arriving temperature, and temperature retention time reduces by half, and after insulation terminates, a biscuit loading flat-die is carried out the second fire and is upset as secondary biscuit, press forges and presses a biscuit makes it with 0.001s
- 1~ 0.01s
-1strain rate after flat-die internal strain amount reaches 30% ~ 50%, take out air cooling;
Secondary biscuit described in heating below transformation temperature 20 DEG C ~ 30 DEG C, is incubated by this secondary biscuit effective thickness 0.6 ~ 1min/mm; After heating below upper and lower swaging die to transformation temperature 20 DEG C ~ 30 DEG C, described secondary biscuit is loaded swaging die, press forging and stamping secondary biscuit makes it with 0.001s
-1~ 0.01s
-1strain rate reach 30% ~ 50% postforming forging in swaging die internal strain amount;
After forging, forging is heat-treated, its heat treating regime for being 780 DEG C ~ 820 DEG C × 4 hours, water-cooled; 590 DEG C ~ 650 DEG C × 8 hours, air cooling.
2. according to the isothermal forging method of TC17 titanium alloy disk forge piece according to claim 1, it is characterized in that: at its surface spraying glass lubricant after described excellent ingot is preheating to 200 DEG C ~ 300 DEG C before heating is die-filling.
3., according to the isothermal forging method of TC17 titanium alloy disk forge piece according to claim 1, it is characterized in that: described flat-die and swaging die before described excellent ingot is die-filling at mould surface spraying glass lubricant.
4. according to the isothermal forging method of TC17 titanium alloy disk forge piece according to claim 1, it is characterized in that: described forging heat treating regime is 800 DEG C ± 10 DEG C × 4 hours, water-cooled; 620 DEG C ± 10 DEG C × 8 hours, air cooling.
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