CN114653874B - Forging method of titanium alloy forging - Google Patents

Forging method of titanium alloy forging Download PDF

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Publication number
CN114653874B
CN114653874B CN202210413781.1A CN202210413781A CN114653874B CN 114653874 B CN114653874 B CN 114653874B CN 202210413781 A CN202210413781 A CN 202210413781A CN 114653874 B CN114653874 B CN 114653874B
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forging
beta
bar
coefficient
titanium alloy
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CN114653874A (en
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杨辉
雷丹
吕小茹
王莹
何俊
孙雪松
覃佳栋
乔红武
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AECC Aviation Power Co Ltd
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AECC Aviation Power Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/003—Selecting material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/04—Shaping in the rough solely by forging or pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/10—Drives for forging presses
    • B21J9/20—Control devices specially adapted to forging presses not restricted to one of the preceding subgroups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K29/00—Arrangements for heating or cooling during processing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces

Abstract

The application provides a forging method of a titanium alloy forging, which is characterized in that components, phase transition points and tensile strength of a titanium alloy bar are detected, a beta-phase condition stability coefficient is calculated based on the components of the titanium alloy forging to be processed, a forging heating temperature is further calculated according to the tensile strength of the bar and the beta-phase condition stability coefficient, the formed forging is subjected to heat treatment according to the beta-phase condition stability coefficient, the heat treatment temperature and the conversion coefficient of the beta-phase condition stability coefficient are positively correlated, the corresponding forging heating temperature and the heat treatment temperature correspond to each other according to the components, the phase transition points and the tensile strength of the bar, the process method is simple, the requirements of the structure and the performance of the forging can be met through heat treatment and thermoforming, meanwhile, the dispersity of the strength index of the forging is reduced, the standard deviation of the strength index is reduced, and the consistency of data is improved.

Description

Forging method of titanium alloy forging
Technical Field
The application belongs to the technical field of thermoforming and heat treatment, and particularly relates to a forging method of a titanium alloy forging.
Background
For titanium alloy, if the quality of the forged bar is low, the components are uneven, the performance and the tissue fluctuation are large, and the performance fluctuation after forging the forged bar is increased.
Ti-4Al-1.5Mn is a low alloyed Ti-A1-Mn based near alpha titanium alloy. Contains 4% of alpha stable element Al and 1.5% of beta stable element Mn, and also contains a small amount of Fe and impurity elements such as C, N, H, O and the like. Is widely applied in the aerospace industry. Under different heating and cooling conditions, different structures are presented in the titanium alloy; proper forging and heat treatment can control phase transformation and obtain a desired microstructure, so as to obtain the structures, mechanical properties and technological properties of different alloys. For the alloy, if the technological parameters are controlled inaccurately, the forging temperature, the deformation and the heat treatment temperature are not well matched, and even if the structure and the performance can meet the standard requirements, the dispersity among data is large, and the quality consistency of products is poor.
In the prior art, the titanium alloy is treated to ensure that the dispersibility of the strength fluctuation of the forging and the consistency of the structure performance of the forging cannot be solved, and the strength reducing capability is poor.
Disclosure of Invention
Aiming at the problems in the prior art, the application provides a forging method of a titanium alloy forging, which can improve the uniformity of forging structure and improve the performance of parts.
The application is realized by the following technical scheme:
the forging method of the titanium alloy forging piece is characterized by comprising the following steps of:
s1: detecting components, phase transition points and tensile strength of the titanium alloy bar, and calculating a beta-phase condition stability coefficient based on the components of the titanium alloy forging to be processed;
s2: cutting the titanium alloy bar material according to a preset size to form a bar material, heating the bar material, and preserving heat;
s3: upsetting and punching the steel bar Wen Bangliao to form a forging, and calculating a forging heating temperature based on a forging heating temperature formula, wherein the forging heating temperature is inversely related to the product of the conversion coefficient of the tensile strength of the steel bar and the conversion coefficient of the beta-phase condition stability coefficient;
s4: shaping the forged and heated forging, performing heat treatment according to the beta-phase condition stability coefficient, converting the heat treatment temperature and the beta-phase condition stability coefficient into positive correlation, and preserving heat and cooling the forging after heat treatment.
Further, the titanium alloy bar adopts Ti-4Al-1.5Mn titanium alloy.
Further, the beta stabilizing elements are manganese Mn and Fe;
the beta phase conditional stability coefficient is K β The calculation process is as follows:
K β ＝C 1 /C k1 +C 2 /C k2 ；
wherein C is 1 The weight percentage of Mn in the alloy is as follows; c (C) k1 Is the critical concentration weight percent of Mn;
C 2 the weight percentage of Fe in the alloy is as follows; c (C) k2 Is the critical concentration weight percent of Fe.
Further, the heating temperature of the bar in the step S2 is 30-50 ℃ below the phase transition point.
Further, the heat preservation time in the step S2 is in direct proportion to the diameter of the bar, and the heat preservation time is increased by 0.8-1.0 min per millimeter of the diameter of the bar.
Further, in the step S3, the forging heating temperature coefficient is C, and the calculation process is as follows:
C＝A×B；
wherein A is a material strength conversion coefficient, and B is a conversion coefficient of a beta-phase condition stability coefficient Kbeta.
Further, if the tensile strength Rm of the bar is not less than 690MPa and the tensile strength Rm is less than 740MPa, a=0.9;
if the tensile strength Rm of the bar is not less than 740MPa and the tensile strength Rm is less than 840MPa, a=1.0;
if the tensile strength Rm is greater than 840MPa, a=1.1.
Further, if the beta-phase conditional stability factor is K β Less than 0.25, then B is 0.9;
if the beta phase condition stability factor is K β Not less than 0.25, and the beta phase condition stability coefficient is K β Greater than 0.27, then B is 1.0;
if the beta phase condition stability factor is K β Greater than 0.27, then B is 1.1.
Further, if the forging heating temperature coefficient C is greater than 1, selecting the forging heating temperature which is 50 ℃ below the transformation point;
if the forging heating temperature coefficient C is equal to 1, selecting the temperature below the transformation point of 40 ℃ as the forging heating temperature;
if the forging heating temperature coefficient C is less than 1, selecting the forging heating temperature below the transformation point of 30 ℃.
Further, the heat treatment temperature of the step S4 is selected,
if B is 0.9, the heat treatment temperature is 720 ℃;
if B is 1.0, the heat treatment temperature is 750 ℃;
if B is 1.1, the heat treatment temperature is 770 ℃.
Compared with the prior art, the application has the following beneficial technical effects:
the application provides a forging method of a titanium alloy forging, which is characterized in that components, phase transition points and tensile strength of a titanium alloy bar are detected, a beta-phase condition stability coefficient is calculated based on the components of the titanium alloy forging to be processed, a forging heating temperature is further calculated according to the tensile strength of the bar and the beta-phase condition stability coefficient, the formed forging is subjected to heat treatment according to the beta-phase condition stability coefficient, the heat treatment temperature and the conversion coefficient of the beta-phase condition stability coefficient are positively correlated, the corresponding forging heating temperature and the heat treatment temperature correspond to each other according to the components, the phase transition points and the tensile strength of the bar, the process method is simple, the requirements of the structure and the performance of the forging can be met through heat treatment and thermoforming, meanwhile, the dispersity of the strength index of the forging is reduced, the standard deviation of the strength index is reduced, and the consistency of data is improved.
Drawings
FIG. 1 is a flow chart of a forging method of a titanium alloy forging in accordance with an embodiment of the present application.
Detailed Description
The application will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the application.
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The application provides a forging method of a titanium alloy forging, which is shown in fig. 1 and comprises the following steps:
s1: detecting components, phase transition points and tensile strength of the titanium alloy bar, and calculating a beta-phase condition stability coefficient based on the components of the titanium alloy forging to be processed;
s2: cutting the titanium alloy bar material according to a preset size to form a bar material, heating the bar material, and preserving heat; specifically, in the cutting process, the cutting process is required to be carried out according to the specification requirements and the processing size requirements; in the process of heating the bar stock, the bar stock can be placed in a qualified area of an electric furnace for carrying out;
s3: upsetting and punching the steel bar Wen Bangliao to form a forging, and calculating a forging heating temperature based on a forging heating temperature formula, wherein the forging heating temperature is inversely related to the product of the conversion coefficient of the tensile strength of the steel bar and the conversion coefficient of the beta-phase condition stability coefficient;
specifically, after the bar is warmed, the bar is taken out of the electric furnace and is upset and punched on a forging hammer. Upsetting the bar stock to be 0.95 times of the height of the annular forging, and punching by using a punch to obtain the forging.
S4: carrying out heat treatment on the forged piece after forging and heating forming according to the beta-phase condition stability coefficient, wherein the heat treatment temperature and the conversion coefficient of the beta-phase condition stability coefficient are positively correlated, and preserving heat and cooling the forged piece after heat treatment, wherein the cooling can be in an air cooling mode;
specifically, in the forging forming process, the forging is taken out of the electric furnace, a horse frame is reamed on a forging hammer, and the wall thickness deformation of the ring piece is controlled to be 40% -60% of the relative deformation; the calculation formula of the deformation is as follows:
relative deformation= ((T) 0 -T 1 )/T 0 )％，
Wherein T is 0 For wall thickness before reaming, T 1 The wall thickness after reaming;
furthermore, before the hot nursing of the forging, the forging needs to be cleaned, and the shot blasting treatment can be adopted to clean the oxide skin on the surface.
Further, the titanium alloy bar adopts Ti-4Al-1.5Mn titanium alloy; specifically, the beta stabilizing elements are manganese Mn and Fe;
the beta phase conditional stability coefficient is K β The calculation process is as follows:
K β ＝C 1 /C k1 +C 2 /C k2 ；
wherein C is 1 Is Mn in the presentWeight percent in the alloy; c (C) k1 Is the critical concentration weight percent of Mn;
C 2 the weight percentage of Fe in the alloy is as follows; c (C) k2 Is the critical concentration weight percent of Fe.
The application provides a preferred embodiment, wherein the heat preservation time in the step S2 is in direct proportion to the diameter of a bar, and the heat preservation time is increased by 0.8-1.0 min per millimeter of the diameter of the bar; further, the heat preservation time of the forging is as follows: the product of the minimum value of the height and the wall thickness of the forging and (0.8-1.0) min/mm.
In another preferred embodiment of the present application, the forging heating temperature coefficient in step S3 is C, and the calculation process is as follows:
C＝A×B；
wherein A is a material strength conversion coefficient, and B is a conversion coefficient of a beta-phase condition stability coefficient Kbeta.
Further, if the tensile strength Rm of the bar is not less than 690MPa and the tensile strength Rm is less than 740MPa, a=0.9;
if the tensile strength Rm of the bar is not less than 740MPa and the tensile strength Rm is less than 840MPa, a=1.0;
if the tensile strength Rm is greater than 840MPa, a=1.1.
Further, if the beta-phase conditional stability factor is K β Less than 0.25, then B is 0.9;
if the beta phase condition stability factor is K β Not less than 0.25, and the beta phase condition stability coefficient is K β Greater than 0.27, then B is 1.0;
if the beta phase condition stability factor is K β Greater than 0.27, then B is 1.1.
Further, if the forging heating temperature coefficient C is greater than 1, selecting the temperature below the transformation point as the forging heating temperature;
if the forging heating temperature coefficient C is equal to 1, selecting the temperature below the transformation point of 40 ℃ as the forging heating temperature;
if the forging heating temperature coefficient C is less than 1, selecting the forging heating temperature below the transformation point of 30 ℃.
The preferred embodiment provided by the application is that the heating temperature of the bar stock in the step S2 is 30-50 ℃ below the phase transition point; specifically, the heat treatment temperature in the step S4 is selected,
if B is 0.9, the heat treatment temperature is 720 ℃;
if B is 1.0, the heat treatment temperature is 750 ℃;
if B is 1.1, the heat treatment temperature is 770 ℃.
Example 1
Step 1: detecting the components, (alpha+beta)/beta transformation point and tensile strength of the bar;
a bar with phi of 80mm is adopted, the content of Mn is 1.5 percent, the content of Fe is 0.026 percent, the temperature of (alpha+beta)/beta transformation point is 930 ℃, and the tensile strength is 750MPa.
Step 2: calculation of
Calculating the beta-phase conditional stability coefficient K β
Calculating K according to the content of Mn and Fe β 0.24.
Step 3: bar cutting
Cutting the bar material according to the standard requirement to a size meeting the part processing requirement, wherein the phi is 80mm, and the height is 150mm.
Step 4: bar heating
Heating the electric furnace to 50 ℃ below the (alpha+beta)/beta transformation point, wherein the heating temperature is 880 ℃, placing the bar stock in a qualified area of the electric furnace, and preserving heat for 64min according to the diameter of the bar stock of 0.8 min/mm.
Step 5: upsetting and punching
After the bar material is heated, the bar material is taken out of the electric furnace and is upset and punched on a forging hammer. Upsetting the bar stock to 0.95 times of the height of the annular forging piece, wherein the height is 95mm, and punching the forging piece by a punch for phi 50mm to obtain the forging piece.
Step 6: forging heating
Placing the forging piece in an electric furnace for heating, wherein the forging heating temperature is selected according to a calculated value C:
C＝A×B；
wherein, the A value is 1.0, the B value is 0.9, and the C value is calculated to be 0.9. The forging heating temperature was 30 ℃ at the transformation point and set to 900 ℃.
The heat preservation time of the forging is calculated according to the minimum value of 0.8min/mm of the height and the wall thickness of the forging, and the calculated heat preservation time is 20min.
Step 7: reaming
Taking out the forging from the electric furnace, and performing horse-frame reaming on the forging hammer, wherein the wall thickness deformation of the ring piece is controlled to be 40-60% of the relative deformation. The calculation formula of the deformation is as follows: the relative deformation amount= ((T0-T1)/T0)%, T0 is the wall thickness before reaming, and T1 is the wall thickness after reaming. The forging size is phi 200mm multiplied by phi 175mm multiplied by 100mm.
Step 8: cleaning up
And (5) cleaning oxide skin on the surface by adopting shot blasting treatment.
Step 9: heat treatment of
Heating the electric furnace to the required temperature, placing the forge piece in the electric furnace for heating, selecting the annealing temperature according to the conversion coefficient B of the beta-phase condition stability coefficient Kbeta, setting the heat treatment temperature to 720 ℃ when the B value is 0.9, keeping the heat for 60 minutes, and air-cooling.
Results: the tensile strength of the forging piece obtained by measurement is 755MPa.
Example two
Step 1: detection of the composition, (alpha+beta)/beta transformation point and tensile Strength of the rod
The phi 80mm bar stock is adopted, the content of Mn is 1.65 percent, the content of Fe is 0.027 percent, the temperature of (alpha+beta)/beta transformation point is 935 ℃, and the tensile strength is 760MPa.
Step 2: calculation of
Calculating the beta phase condition stability coefficient Kbeta
Kβ was calculated to be 0.26 based on the contents of Mn and Fe.
Step 3: bar cutting
Cutting the bar material according to the standard requirement to a size meeting the part processing requirement, wherein the phi is 80mm, and the height is 150mm.
Step 4: bar heating
Heating the electric furnace to 50 ℃ below the (alpha+beta)/beta transformation point, wherein the heating temperature is 880 ℃, placing the bar stock in a qualified area of the electric furnace, and preserving heat for 72min according to the diameter of the bar stock of 0.9 min/mm.
Step 5: upsetting and punching
After the bar material is heated, the bar material is taken out of the electric furnace and is upset and punched on a forging hammer. Upsetting the bar stock to 0.95 times of the height of the annular forging piece, wherein the height is 95mm, and punching the forging piece by a punch for phi 50mm to obtain the forging piece.
Step 6: forging heating
Placing the forging piece in an electric furnace for heating, wherein the forging heating temperature is selected according to a calculated value C:
C＝A×B；
wherein, A value is 1.0, B value is 1.0, and C value is 1.0. The forging heating temperature was 40℃at the transformation point and was set to 895 ℃.
The heat preservation time of the forging is calculated according to the minimum value of 0.9min/mm of the height and the wall thickness of the forging, and the calculated heat preservation time is 23min.
Step 7: reaming
Taking out the forging from the electric furnace, and performing horse-frame reaming on the forging hammer, wherein the wall thickness deformation of the ring piece is controlled to be 40-60% of the relative deformation. The calculation formula of the deformation is as follows: the relative deformation amount= ((T0-T1)/T0)%, T0 is the wall thickness before reaming, and T1 is the wall thickness after reaming. The forging size is phi 190mm multiplied by phi 164mm multiplied by 100mm.
Step 8: cleaning up
And (5) cleaning oxide skin on the surface by adopting shot blasting treatment.
Step 9: heat treatment of
Heating the electric furnace to the required temperature, placing the forge piece in the electric furnace for heating, selecting the annealing temperature according to the conversion coefficient B of the beta-phase condition stability coefficient Kbeta, setting the heat treatment temperature to 750 ℃ when the B value is 1.0, keeping the heat for 90 minutes, and air-cooling.
Results: the tensile strength of the forging piece obtained by measurement is 765MPa.
Example III
Step 1: the components, (alpha+beta)/beta transformation point and the tensile strength of the bar are detected by adopting a bar with phi 80mm, the content of Mn is 1.8 percent, the content of Fe is 0.030 percent, the temperature of the (alpha+beta)/beta transformation point is 940 ℃, and the tensile strength is 780MPa.
Step 2: calculation of
Calculating the beta phase condition stability coefficient Kbeta
Kβ was calculated to be 0.286 based on the contents of Mn and Fe.
Step 3: bar cutting
Cutting the bar material according to the standard requirement to a size meeting the part processing requirement, wherein the phi is 80mm, and the height is 150mm.
Step 4: bar heating
Heating the electric furnace to 50 ℃ below the (alpha+beta)/beta transformation point, wherein the heating temperature is 890 ℃, placing the bar stock in a qualified area of the electric furnace, and preserving heat for 80min according to the diameter of the bar stock of 1.0 min/mm.
Step 5: upsetting and punching
After the bar material is heated, the bar material is taken out of the electric furnace and is upset and punched on a forging hammer. Upsetting the bar stock to 0.95 times of the height of the annular forging piece, wherein the height is 95mm, and punching the forging piece by a punch for phi 50mm to obtain the forging piece.
Step 6: forging heating
Placing the forging piece in an electric furnace for heating, wherein the forging heating temperature is selected according to a calculated value C:
C＝A×B；
wherein, the A value is 1.0, the B value is 1.1, the C value is 1.1, the forging heating temperature is determined to be 50 ℃ under the phase transition point according to calculation, and the heat preservation temperature is 890 ℃.
The heat preservation time of the forging is calculated according to the minimum value of the height and the wall thickness of the forging to be 1.0min/mm, and the calculated heat preservation time is 25min.
Step 7: reaming
Taking out the forging from the electric furnace, and performing horse-frame reaming on the forging hammer, wherein the wall thickness deformation of the ring piece is controlled to be 40-60% of the relative deformation. The calculation formula of the deformation is as follows: the relative deformation amount= ((T0-T1)/T0)%, T0 is the wall thickness before reaming, and T1 is the wall thickness after reaming. The forging size is phi 180mm multiplied by phi 152mm multiplied by 100mm.
Step 8: cleaning up
And (5) cleaning oxide skin on the surface by adopting shot blasting treatment.
Step 9: heat treatment of
Heating the electric furnace to the required temperature, placing the forge piece in the electric furnace for heating, selecting the annealing temperature according to the conversion coefficient B of the beta-phase condition stability coefficient Kbeta, setting the heat treatment temperature to 770 ℃ when the B value is 1.1, keeping the heat for 120 minutes, and air-cooling.
Results: and measuring the tensile strength of the obtained forging to 780MPa.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the technical solutions according to the embodiments of the present application.

Claims (6)

1. The forging method of the titanium alloy forging piece is characterized by comprising the following steps of:
s1: detecting components, phase transition points and tensile strength of the titanium alloy bar, and calculating a beta-phase condition stability coefficient based on the components of the titanium alloy forging to be processed; the beta stabilizing elements are manganese Mn and Fe;
the beta phase conditional stability coefficient is K β The calculation process is as follows: k (K) β =C 1 /C k1 + C 2 /C k2 ；
Wherein C is 1 The weight percentage of Mn in the alloy is as follows; c (C) k1 Is the critical concentration weight percent of Mn; c (C) 2 The weight percentage of Fe in the alloy is as follows; c (C) k2 Is the critical concentration weight percentage of Fe;
s2: cutting the titanium alloy bar material according to a preset size to form a bar material, heating the bar material, and preserving heat, wherein the heating temperature of the bar material in the step S2 is 30-50 ℃ below a phase transition point;
s3: upsetting and punching the steel bar Wen Bangliao to form a forging, and calculating a forging heating temperature based on a forging heating temperature formula, wherein the forging heating temperature is inversely related to the product of the conversion coefficient of the tensile strength of the steel bar and the conversion coefficient of the beta-phase condition stability coefficient;
in the step S3, the forging heating temperature coefficient is C, and the calculation process is as follows: c=a×b;
wherein A is the conversion coefficient of tensile strength of the bar, and B is the beta-phase condition stability coefficient K β Is a conversion coefficient of (a);
the product of the forging heating temperature and the conversion coefficient of the tensile strength conversion coefficient of the bar and the conversion coefficient of the beta-phase condition stability coefficient is in negative correlation, and specifically comprises the following steps:
if the forging heating temperature coefficient C is larger than 1, selecting the temperature below the transformation point as the forging heating temperature;
if the forging heating temperature coefficient C is equal to 1, selecting the temperature below the transformation point of 40 ℃ as the forging heating temperature;
if the forging heating temperature coefficient C is smaller than 1, selecting the temperature below the transformation point of 30 ℃ as the forging heating temperature;
s4: shaping the forged and heated forging, performing heat treatment according to the beta-phase condition stability coefficient, converting the heat treatment temperature and the beta-phase condition stability coefficient into positive correlation, and preserving heat and cooling the forging after heat treatment.
2. The forging method of a titanium alloy forging according to claim 1, wherein the titanium alloy bar is made of Ti-4Al-1.5Mn titanium alloy.
3. The forging method of the titanium alloy forging according to claim 1, wherein the heat preservation time in the step S2 is proportional to the diameter of a bar, and the heat preservation time is increased by 0.8-1.0 min per millimeter of the diameter of the bar.
4. A forging method of a titanium alloy forging according to claim 1, wherein,
if the tensile strength Rm of the bar is not less than 690MPa and the tensile strength Rm is less than 740MPa, a=0.9;
if the tensile strength Rm of the bar is not less than 740MPa and the tensile strength Rm is less than 840MPa, a=1.0;
if the tensile strength Rm is greater than 840MPa, a=1.1.
5. A forging method of a titanium alloy forging according to claim 1, wherein,
if the beta phase condition stability factor is K β Less than 0.25, then B is 0.9;
if the beta phase condition stability factor is K β Not less than 0.25, and the beta phase condition stability coefficient is K β Less than 0.27, then B is 1.0;
if the beta phase condition stability factor is K β Greater than 0.27, then B is 1.1.
6. A forging method for a titanium alloy forging according to claim 1, wherein said heat treatment temperature of step S4 is selected,
if B is 0.9, the heat treatment temperature is 720 ℃;
if B is 1.0, the heat treatment temperature is 750 ℃;
if B is 1.1, the heat treatment temperature is 770 ℃.
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