CN107175426B - A kind of self-shield flux-cored wire and preparation method thereof for heavy-duty forging die tool surface peening - Google Patents
A kind of self-shield flux-cored wire and preparation method thereof for heavy-duty forging die tool surface peening Download PDFInfo
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- CN107175426B CN107175426B CN201710409748.0A CN201710409748A CN107175426B CN 107175426 B CN107175426 B CN 107175426B CN 201710409748 A CN201710409748 A CN 201710409748A CN 107175426 B CN107175426 B CN 107175426B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3046—Co as the principal constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
Abstract
The invention discloses a kind of self-shield flux-cored wires and preparation method thereof for heavy-duty forging die tool surface peening; the chemical component of medicine core is calculated in mass percent in the flux-cored wire; including chromium content 26-30%, molybdenum element content 8-10%, wolfram element content 1.8-3%, nickel element content 1.5-2.5%, silicon content 0.8-1.2%, manganese element content 0.6-1.0%, niobium element content 0.15-0.3%, carbon element content 1.2-1.6%, phosphorus element content≤0.02%, sulfur content≤0.02%, surplus is cobalt and impurity.The present invention provides a kind of self-shield flux-cored wires for heavy-duty forging die tool surface peening; flux-cored wire can be carried out to built-up welding on the surface of heavy-duty forging die tool type chamber working region and form surface peening layer; so that the mold cavity surface layer of heavy-duty forging die tool is at 500 ~ 700 DEG C; load is less likely to occur the case where abrasion, deformation and cracking under the conditions of 40,000 tons or more extreme operating conditions; so that the service life of heavy-duty forging die tool improves 10 times or more, hence it is evident that reduce the manufacturing cost of large forgings.
Description
Technical field
The invention belongs to welding material manufacturing technology fields, and in particular to a kind of to have surface peening for heavy-duty forging die
Self-shield flux-cored wire and preparation method thereof.
Background technique
China's 80,000 tons of stamp forging hydraulic press of machinery industry dose necessary achievement (maximum stamp forging hydraulic press in the world) are certainly
Since 2013 put into operation, having played in the manufacture of the fields such as aerospace, the energy, ship large size key part can not be replaced
The effect in generation.It all is used to have (single set weight is up to 60~100 tons) with heavy-duty forging die with synthesis using by stamp forging hydraulic press now
Shape difficult-to-deformation material (such as titanium alloy, high temperature alloy, unimach), at this point, the working region of heavy-duty forging die tool type chamber
Superficial layer is under the extreme operating conditions such as high temperature (500-700 DEG C) heavily loaded (40,000 tons or more), so that the work of heavy-duty forging die tool type chamber
Make region and easily generate the Problem of Failure such as abrasion, deformation, cracking, heavy-duty forging die is caused to have after forging 2-3 part forging just
It can not reuse.Along with the size of present heavy-duty forging die tool big (the unilateral big 3-6m of heavy-duty forging die tool, perspective plane
Product is up to 3-5 ㎡), so that the manufacturing cycle of existing heavy-duty forging die tool is long, the high (system of heavy-duty forging die tool of preparation cost
Cause this in 300-500 ten thousand)；It allows for causing entire big since the working region of large mold type chamber is easily damaged in this way
Type hot forged mould is directly scrapped, so that high using the cost that heavy-duty forging die tool prepares forging；Accordingly, it is now desired to study one
Dedicated self-shield flux-cored wire is planted as the surface peening layer of heavy-duty forging die tool type chamber, to solve heavy-duty forging die tool type
Chamber is easy to produce the problems such as abrasion, deformation, cracking under the extreme operating condition of high temperature heavy load condition；Due to there was only Russia in the world now
Ross has two 7.5 ten thousand tons of stamp forging hydraulic press and 80,000 tons of stamp forging hydraulic press to belong to same magnitude, therefore, now to 80,000 tons of moulds
The correlative study for the heavy-duty forging die tool that forging hydraulic machine is used cooperatively is very few, has not yet seen be used as large-scale heat so far
The relevant report of the material of forging mould mold cavity surface strengthening layer.
Summary of the invention
In view of the above shortcomings of the prior art, the technical problems to be solved by the present invention are: providing a kind of for large-scale heat
The self-shield flux-cored wire of forging mould surface peening solves the mold cavity surface layer working region of existing heavy-duty forging die tool in temperature
Degree is 500~700 DEG C, and abrasion, deformation and cracking occurs under 40,000 tons or more of extreme condition in load, leads to heavy-duty forging die
Have the technical problems such as service life is extremely short；A kind of self-shield medicine core for heavy-duty forging die tool surface peening is additionally provided simultaneously
The preparation method of silk material.
In order to solve the above-mentioned technical problem, The technical solution adopted by the invention is as follows:
A kind of self-shield flux-cored wire for heavy-duty forging die tool surface peening, in the flux-cored wire chemistry of medicine core at
Divide and be calculated in mass percent, including chromium content 26-30%, molybdenum element content 8-10%, wolfram element content 1.8-3%, nickel
Constituent content 1.5-2.5%, silicon content 0.8-1.2%, manganese element content 0.6-1.0%, niobium element content 0.15-
0.3%, carbon element content 1.2-1.6%, phosphorus element content≤0.02%, sulfur content≤0.02%, surplus are cobalt and miscellaneous
Matter.
In the technical program, by the composition to the surface peening layer raw material in heavy-duty forging die tool type chamber and progress is matched
A large amount of research, is prepared flux-cored wire；Then flux-cored wire heap is welded in heavy-duty forging die tool type chamber and forms surface
Strengthening layer, and heavy-duty forging die tool meets in molding large difficult-to-deformation material forging on 80,000 tons of stamp forging hydraulic press, large-scale heat
The case where surface peening layer in forging mould type chamber meets performance requirement, is less prone to abrasion, deformation and cracking；It can also improve
Bond strength between transition zone；This is because the mass percent containing chromium is 26-30%, this is to form Cr7C7、
Cr23C6、Cr3The compounds such as C, suitable Cr-C type carbide can be used as high-temperature wearable skeleton, the branch as cobalt-based solid solution
Support；Along with molybdenum, tungsten, niobium element are the formation element of strong carbide, they can not only form composite carbon with chromium, carbon
Compound further increases the high temperature abrasion resistance of silk material, additionally it is possible to preferentially be precipitated in molten bath, Dispersed precipitate thinning microstructure；Nickel right and wrong
Carbide former, suitable nickel strengthen matrix, reduce superheated susceptivity, play the role of precipitation strength, are improving steel
Good toughness is kept while intensity and hardness；Silicon, manganese, carbon (graphite powder) play the role of deoxidation and fix, and enhance self-shield.
Therefore, so that flux-cored wire built-up welding produced by the present invention formed surface peening layer at normal temperature mechanical property can satisfy it is following
It is required that: yield strength σ s >=800MPa, tension degree σ b >=1050MPa, elongation percentage δ >=20%, shrinking percentage Ψ >=30%, ballistic work
Akv≥35J；So that flux-cored wire provided by the invention in heavy-duty forging die tool type chamber built-up welding formed surface peening layer after, table
The mechanical property of surface strengthening layer at normal temperature can satisfy requirement, so that the present invention is 500-700 DEG C in temperature, load is 40,000
Ton or more extreme operating condition under, surface peening layer be not susceptible to abrasion, deformation and cracking the case where so that heavy-duty forging die tool
Service life improves 10 times or more.
Preferably, the chemical component of medicine core is calculated in mass percent in the flux-cored wire, including chromium content
28%, molybdenum element containing 9%, wolfram element content 2.4%, nickel element content 2%, silicon content 1%, manganese element content 0.8%,
Niobium element content 0.23%, carbon element content 1.4%, phosphorus element content 0.01%, sulfur content 0.01%, surplus be cobalt and
Impurity.Using above-mentioned raw materials composition and raw material proportioning, the built-up welding in heavy-duty forging die tool type chamber of the flux-cored wire of preparation is formed
The mechanical property of surface peening layer at normal temperature is more balanced.
For the self-shield flux-cored wire of heavy-duty forging die tool surface peening described in any one of claim 1-4
Preparation method includes the following steps:
1) 1h is respectively dried in raw material at 120 DEG C, using 80 mesh sieve respectively to the various raw material after drying into
Row screening, the raw material after screening are saved backup in the environment of 80 DEG C；
2) raw material for weighing flux-cored wire medicine core as desired, weighed raw material are added in batch mixer and are mixed
2h obtains medicine core powder；
3) after obtaining H08A steel band progress ultrasonic cleaning and drying, the cross section of H08A steel band is processed into U-shaped structure,
Then roll forming is carried out after medicine core powder obtained in step 2) being added in H08A steel band with powder adding machine, then by H08A
Steel band heals up to form flux-cored wire matrix；
4) using wire drawing die will be obtained in step 3) flux-cored wire matrix carry out drawing tube reducing, obtain diameter be 1.6~
The flux-cored wire of 3.2mm.
In the technical program, by the design to flux-cored wire ingredient and proportion, then it is prepared by the above method
Flux-cored wire, so that the hardness of flux-cored wire produced by the present invention at normal temperature is about HRC30-33, flux-cored wire is at normal temperature
Hardness it is moderate, processing performance is good；Also facilitate and flux-cored wire is subjected to built-up welding in heavy-duty forging die tool type chamber, then pass through machine
Tool processing, so that available high-precision degree type chamber in heavy-duty forging die tool；In addition, the flux-cored wire built-up welding shape in through the invention
At surface peening layer for a long time under the extreme operating condition of high temperature heavy load, carry out periodical tempering with to surface peening layer
It influences similar, is improved the hardness of surface peening layer to a certain extent；Surface
Strengthening layer interior tissue under the effect of high temperature impact load can generate a large amount of dislocation and twin, with the effect of shock loading,
Between each dislocation, mutually complete a business transaction entanglement between dislocation and twin, form highdensity cell structure so that dislocation motion by
Resistance.Meanwhile the equal a large amount of diffusion carbide particles with precipitation of intermetallic compound NiW hard alloy of formation, it makes it have
Obviously shock peening effect, so during large-scale difficult-to-deformation material forging forming, the intensity of surface peening layer and
Hardness has promotion instead；So that situations such as more difficult appearance of surface peening layer wears, deforms and crack.
Preferably, the diameter of flux-cored wire obtained in the step 4) is 2.4mm.The diameter of flux-cored wire is arranged
For 2.4mm, so that by the surface in heavy-duty forging die tool type chamber 3-5 layers of flux-cored wire of built-up welding can form table
Surface strengthening layer, it is very few on the one hand to avoid the built-up welding number of plies, the problem of element transition occurs between surface peening layer and transition zone, leads
The institutional framework of surface peening layer is caused to be difficult to control；On the other hand, it avoids the built-up welding number of plies excessive, surface peening layer is caused to be subject to
Heat affecting is big, and welding workload is big, built-up welding low efficiency；Thus it is guaranteed that the wear-resistant of surface peening layer, resistance to deformation and heat
While stability is more preferable, so that the weldering of surface peening layer heap is more efficient.
Compared with prior art, the present invention has the advantage that:
(1) composition and proportion of the invention by the surface peening layer raw material in heavy-duty forging die tool type chamber has carried out greatly
Flux-cored wire is prepared in quantifier elimination；So that the flux-cored wire surface peening that built-up welding is formed in heavy-duty forging die tool type chamber
The mechanical property of layer can achieve: σ s (yield strength) >=800MPa, σ b (tension degree) >=1050Mpa, δ (elongation percentage) >=
20%, Ψ (shrinking percentage) >=30%, Akv (ballistic work) >=35J；So that heavy-duty forging die have surface peening layer high temperature (500~
700 DEG C) heavily loaded (40,000 tons or more)) working condition under wear-resistant, resistance to deformation and thermal stability can satisfy requirements, it is logical
It crosses it is demonstrated experimentally that compared with prior art, so that the service life of heavy-duty forging die tool improves 10 times or more.
(2) hardness of flux-cored wire produced by the present invention at normal temperature is about HRC30-33, so that flux-cored wire is in room temperature
Under hardness it is moderate, processing performance is good；Facilitate and flux-cored wire is subjected to built-up welding in heavy-duty forging die tool type chamber, then passes through machine
Tool processing, so that available high-precision degree type chamber in heavy-duty forging die tool；Improve the Forming Quality and welding of surface peening layer
Processing performance；In addition, the surface peening layer that the flux-cored wire built-up welding in through the invention is formed is for a long time in the pole of high temperature heavy load
It holds under operating condition, it is similar to the periodical influence of tempering of surface peening layer progress, make under the extreme operating condition of high temperature heavy load
The hardness for obtaining surface peening layer is improved to a certain extent；Improve the hardness and strength of surface peening layer same
When, additionally it is possible to guarantee that the bond strength between surface peening layer and transition zone reaches 1000MPa or more, will not go out in the course of work
The case where now falling off.
(3) contain the elements such as silicon, manganese in flux-cored wire provided in the present invention in the composition of medicine core, guarantee surface peening
The good wear-resistant, resistance to deformation of layer and thermal stability are simultaneously；Also make in the welding process, silicon, manganese in flux-cored wire etc.
It is reacted in the welding process with oxygen, therefore does not need to be passed through argon gas or carbon dioxide during the welding process as protection gas
Body, the welding surroundings for enabling flux-cored wire to form anaerobic in the process of welding form self-insurance to the flux-cored wire welded
Shield effect, therefore oxide skin is nearly free from during built-up welding forms surface peening layer in flux-cored wire, weld seam is beautiful, also
So that scarfing cinder is not needed when multiple tracks multi-layer welding, while improving the efficiency of surface peening layer heap weldering, so that the table that built-up welding is formed
The better quality of surface strengthening layer.
Specific embodiment
Invention is further described in detail combined with specific embodiments below.Specific medicine core described in following embodiments
The component proportion of medicine core in silk material, process conditions and as a result, in order to preferably explain the present invention, without constituting to the present invention
The restriction of protection scope.
Embodiment 1
1) 1h is respectively dried in raw material chromium, molybdenum, tungsten, nickel, silicon, manganese, niobium, carbon, phosphorus, sulphur and cobalt at 120 DEG C, using 80
Mesh sieve respectively sieves the various raw material after drying, the raw material after screening is saved in the environment of 80 DEG C standby
With；
2) raw material of flux-cored wire medicine core are weighed according to following match: chromium content 28%, molybdenum element content 9%,
Wolfram element content 2.4%, nickel element content 2%, silicon content 1%, manganese element content 0.8%, niobium element content 0.23%,
Carbon element content 1.4%, phosphorus element content 0.01%, sulfur content 0.01%, surplus are cobalt, and weighed raw material are added
2h is mixed into batch mixer, obtains medicine core powder；
3) after obtaining H08A steel band progress ultrasonic cleaning and drying, the cross section of H08A steel band is processed into U-shaped structure,
Then roll forming is carried out after medicine core powder obtained in step 2) being added in H08A steel band with powder adding machine, then by H08A
Steel band heals up to form flux-cored wire matrix；
4) flux-cored wire matrix will be obtained using wire drawing die in step 3) and carry out drawing tube reducing, obtaining diameter is 2.4mm's
Flux-cored wire.
Sample 1,2,3 is obtained by surface peening layer self-shield flux-cored wire built-up welding 3 times obtained in embodiment 1 respectively；Control
Welding current processed is 130A, weldingvoltage 26V, speed of welding 0.3m/min.Interlayer welding temperature is controlled at 300 DEG C.It is right
The mechanical property for the surface peening layer that the welding technological properties of flux-cored wire and welding are formed is detected to obtain table 1.
Table 1 is the surface peening of the welding technological properties of sample 1,2,3 and flux-cored wire built-up welding 3 times formation in embodiment 1
The mechanical property table of layer
Embodiment 2
1) 1h is respectively dried in raw material chromium, molybdenum, tungsten, nickel, silicon, manganese, niobium, carbon, phosphorus, sulphur and cobalt at 120 DEG C, using 80
Mesh sieve respectively sieves the various raw material after drying, the raw material after screening is saved in the environment of 80 DEG C standby
With；
2) raw material of flux-cored wire medicine core are weighed according to following match: chromium content 26%, molybdenum element content 8%,
Wolfram element content 1.8%, nickel element content 1.5%, silicon content 0.8%, manganese element content 0.6%, niobium element content
0.15%, carbon element content 1.2%, phosphorus element content 0.01%, sulfur content 0.01%, surplus are cobalt, by weighed original
Material, which is added in batch mixer, mixes 2h, obtains medicine core powder；
3) after obtaining H08A steel band progress ultrasonic cleaning and drying, the cross section of H08A steel band is processed into U-shaped structure,
Then roll forming is carried out after medicine core powder obtained in step 2) being added in H08A steel band with powder adding machine, then by H08A
Steel band heals up to form flux-cored wire matrix；
4) flux-cored wire matrix will be obtained using wire drawing die in step 3) and carry out drawing tube reducing, obtaining diameter is 2.4mm's
Flux-cored wire.
Sample 4,5,6 is obtained by surface peening layer self-shield flux-cored wire built-up welding 3 times obtained in embodiment 1 respectively；Control
Welding current processed is 130A, weldingvoltage 26V, speed of welding 0.3m/min.Interlayer welding temperature is controlled at 300 DEG C.It is right
The mechanical property for the surface peening layer that the welding technological properties of flux-cored wire and welding are formed is detected to obtain table 2.
Table 2 is the surface peening of the welding technological properties of sample 4,5,6 and flux-cored wire built-up welding 3 times formation in embodiment 2
The mechanical property table of layer
Embodiment 3
1) 1h is respectively dried in raw material chromium, molybdenum, tungsten, nickel, silicon, manganese, niobium, carbon, phosphorus, sulphur and cobalt at 120 DEG C, using 80
Mesh sieve respectively sieves the various raw material after drying, the raw material after screening is saved in the environment of 80 DEG C standby
With；
2) raw material of flux-cored wire medicine core are weighed according to following match: chromium content 30%, molybdenum element content 10%,
Wolfram element content 3%, nickel element content 2.5%, silicon content 1.2%, manganese element content 1.0%, niobium element content
0.3%, carbon element content 1.6%, phosphorus element content 0.01%, sulfur content 0.01%, surplus are cobalt, by weighed former material
Material, which is added in batch mixer, mixes 2h, obtains medicine core powder；
3) after obtaining H08A steel band progress ultrasonic cleaning and drying, the cross section of H08A steel band is processed into U-shaped structure,
Then roll forming is carried out after medicine core powder obtained in step 2) being added in H08A steel band with powder adding machine, then by H08A
Steel band heals up to form flux-cored wire matrix；
4) flux-cored wire matrix will be obtained using wire drawing die in step 3) and carry out drawing tube reducing, obtaining diameter is 2.4mm's
Flux-cored wire.
Sample 7,8,9 is obtained by surface peening layer self-shield flux-cored wire built-up welding 3 times obtained in embodiment 1 respectively；Control
Welding current processed is 130A, weldingvoltage 26V, speed of welding 0.3m/min.Interlayer welding temperature is controlled at 300 DEG C.It is right
The mechanical property for the surface peening layer that the welding technological properties of flux-cored wire and welding are formed is detected to obtain table 3.
Table 3 is the surface peening of the welding technological properties of sample 7,8,9 and flux-cored wire built-up welding 3 times formation in embodiment 3
The mechanical property table of layer
It is practiced through actual production, heavy-duty forging die tool has produced qualified titanium alloy forging 7 on 80,000 tons of press at present
Batch, the heavy-duty forging die tool type chamber prepared using surface peening layer material is in good condition, slight oxidation phenomenon only occurs, not shadow
Service precision is rung, the service life improves 10 times or more.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the scope of the claims of invention.
Claims (5)
1. a kind of self-shield flux-cored wire for heavy-duty forging die tool surface peening, which is characterized in that the flux-cored wire Chinese medicine
The chemical component of core is calculated in mass percent, including chromium content 26-30%, molybdenum element content 8-10%, wolfram element content
1.8-3%, nickel element content 1.5-2.5%, silicon content 0.8-1.2%, manganese element content 0.6-1.0%, niobium element content
0.15-0.3%, carbon element content 1.2-1.6%, phosphorus element content≤0.02%, sulfur content≤0.02%, surplus are cobalt and miscellaneous
Matter.
2. the self-shield flux-cored wire according to claim 1 for heavy-duty forging die tool surface peening, which is characterized in that
The chemical component of medicine core is calculated in mass percent in the flux-cored wire, including chromium content 28%, molybdenum element contain 9%, wolfram element
Content 2.4%, nickel element content 2%, silicon content 1%, manganese element content 0.8%, niobium element content 0.23%, carbon element content
1.4%, phosphorus element content 0.01%, sulfur content 0.01%, surplus are cobalt and impurity.
3. the self-shield flux-cored wire according to claim 1 for heavy-duty forging die tool surface peening, which is characterized in that
The surface peening layer that the flux-cored wire built-up welding is formed mechanical property at normal temperature are as follows: yield strength σ s >=800MPa, tension degree σ
B >=1050MPa, elongation percentage δ >=20%, shrinking percentage Ψ >=30%, Impact energy Ak v >=35J.
4. the system described in any one of claim 1-3 for the self-shield flux-cored wire of heavy-duty forging die tool surface peening
Preparation Method, which comprises the steps of:
1) 1h is respectively dried at 120 DEG C in raw material, the various raw material after drying is sieved respectively using 80 mesh sieve
Point, the raw material after screening are saved backup in the environment of 80 DEG C；
2) raw material of flux-cored wire medicine core are weighed as desired, and weighed raw material are added in batch mixer and mix 2h,
Obtain medicine core powder；
3) after obtaining H08A steel band progress ultrasonic cleaning and drying, the cross section of H08A steel band is processed into U-shaped structure, then
Roll forming is carried out after medicine core powder obtained in step 2 is added in H08A steel band with powder adding machine, finally closes H08A steel band
Mouth forms flux-cored wire matrix；
4) flux-cored wire matrix will be obtained using wire drawing die in step 3) and carry out drawing tube reducing, obtaining diameter is 1.6 ~ 3.2mm's
Flux-cored wire.
5. the preparation method of the self-shield flux-cored wire according to claim 4 for heavy-duty forging die tool surface peening,
It is characterized in that, the diameter of flux-cored wire obtained in the step 4) is 2.4mm.
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| CN108637523A (en) * | 2018-05-14 | 2018-10-12 | 北京智双科技发展有限公司 | A kind of 1900MPa grade super strengths steel alloy flux-cored wire used for welding |
| CN109894772B (en) * | 2019-04-29 | 2021-03-19 | 重庆大学 | Flux-cored wire for skin layer of large-scale hot-forging die with fist-shaped bionic structure and preparation method of flux-cored wire |
| TWI728921B (en) * | 2020-10-06 | 2021-05-21 | 中國鋼鐵股份有限公司 | Method for fining grains of titanium alloy weldment and titanium alloy weldment |
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|---|---|
| CN107175426A (en) | 2017-09-19 |
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