CN112935260A - Easily machined alloy bar and preparation method thereof - Google Patents
Easily machined alloy bar and preparation method thereof Download PDFInfo
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 118
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 238000001513 hot isostatic pressing Methods 0.000 claims abstract description 97
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 14
- 239000002775 capsule Substances 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 13
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- 239000000463 material Substances 0.000 description 5
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- 239000011572 manganese Substances 0.000 description 4
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- 239000002184 metal Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 3
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
- B22F7/08—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools with one or more parts not made from powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
- B22F3/15—Hot isostatic pressing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/36—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.7% by weight of carbon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Manufacturing & Machinery (AREA)
- Composite Materials (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention relates to an alloy bar easy to machine and a preparation method thereof, wherein the alloy bar easy to machine comprises a sheathed bar with a component of a first alloy and a bar core with a component of a second alloy, and the sheathed bar is arranged on the periphery of the bar core; in terms of mass fraction: in the first alloy, the content of C is 1.8-2.9, the content of Si is 0.4-1.2, the content of Mn is 0.2-0.9, the content of Cr is 4-7.8, the content of Mo is 0.8-4.0, the content of V is 6.5-12, the content of S is 0.1-0.5, the content of N is 0.04-0.10, and the balance is Fe; in the second alloy, the content of C is 0.15-2.1%. The alloy bar easy to machine provided by the invention is prepared by adopting a powder metallurgy process, the periphery of the alloy bar easy to machine is prepared by the first powder alloy, the segregation of alloy elements is avoided, and the segregation-free state of the alloy elements and the uniform distribution of microstructures can be kept after the densification of the hot isostatic pressing process, so that the alloy bar easy to machine has high wear resistance and good machining performance.
Description
Technical Field
The invention relates to the technical field of alloy materials, in particular to an alloy bar easy to machine and a preparation method thereof.
Background
For many machine tools or machine parts, there are generally two expectations for the alloy materials used: on one hand, the wear-resistant alloy needs to have excellent wear resistance, so that a tool or a part has a long service life; on the other hand, since multiple machining operations are required from the starting material to the final form of the machine tool or part, it is desirable that the alloy material has good machinability to reduce the machining cost.
A typical part such as a screw block or an engaging block part of a plastic extruder has the defects that when hard fillers such as glass fibers, carbon fibers, ceramics, calcium carbonate and the like exist in plastic, the end face of the edge of the screw block or the engaging block is severely abraded, and the wear resistance of the screw block or the engaging block is extremely high. Meanwhile, the thread block or the meshing block needs to be machined from the original alloy bar to a final product through a material removing machine with a large removing amount, a through hole needs to be machined in the center of the bar, various meshing tooth shapes need to be machined on the outer circle of the bar, and the total removing amount is about 50%, so that the machining performance of the alloy bar has a large influence on the final manufacturing cost of the part.
At present, the traditional alloy (such as M2 high-speed steel) is used as the raw material of the thread block or the meshing block component of the plastic extruder in China. In the face of possible severe abrasion working conditions of the plastic extruder, the abrasion resistance of the M2 high-speed steel is limited, and meanwhile, the scheme cannot well solve the problem of cost reduction of center hole machining and outer circular edge machining.
Disclosure of Invention
In view of the above, there is a need to provide an alloy bar and a method for making the same that are easy to machine, and address at least one of the problems mentioned above.
In a first aspect, the present application provides an easily machinable alloy rod including a sheathed rod composed of a first alloy and a core composed of a second alloy, the sheathed rod being disposed on a peripheral side of the core; in terms of mass fraction:
in the first alloy, the content of C is 1.8-2.9, the content of Si is 0.4-1.2, the content of Mn is 0.2-0.9, the content of Cr is 4-7.8, the content of Mo is 0.8-4.0, the content of V is 6.5-12, the content of S is 0.1-0.5, the content of N is 0.04-0.10, and the balance is Fe;
in the second alloy, the content of C is 0.15-2.1%.
In certain implementations of the first aspect, the machinable alloy bar is cylindrical; the diameter of the alloy bar easy to machine is 30-400 mm, the diameter of the bar core is 20-300 mm, and the diameter of the bar core is smaller than that of the alloy bar easy to machine.
With reference to the first aspect and the foregoing implementations, in certain implementations of the first aspect, the second alloy is 45# steel; in the first alloy, C% was 2.5, Si% was 0.8, Mn% was 0.5, Cr% was 5.25, Mo% was 4.0, V% was 9.75, S% was 0.2, and N% was 0.05.
In a second aspect, the present application provides a method for preparing an easily machinable alloy bar, the method comprising the steps of:
placing a first alloy in powder form and a second alloy rod core in a rod shape in a hot isostatic pressing capsule, wherein the second alloy rod core is arranged in the center of the hot isostatic pressing capsule, and the first alloy is filled between the second alloy rod core and the inner wall of the hot isostatic pressing capsule;
vacuumizing and degassing the hot isostatic pressing sheath to a preset vacuum degree, and heating the hot isostatic pressing sheath to 180-220 ℃ and preserving heat for a preset time;
performing hot isostatic pressing treatment on the capped hot isostatic pressing sheath, wherein the hot isostatic pressing treatment temperature is 1050-1250 ℃, the pressure is 120-200 MPa, and the pressure maintaining time is 1-3 hours;
and cooling the hot isostatic pressing sheath along with the furnace to obtain the alloy bar easy to machine.
In certain implementations of the second aspect, the hot isostatic pressing capsule is a cylindrical hot isostatic pressing capsule with an open end, and the diameter of the hot isostatic pressing capsule is 30-400 mm.
With reference to the second aspect and the foregoing implementation manners, in some implementation manners of the second aspect, in the step of subjecting the hot isostatic pressing capsule after the end-capping to hot isostatic pressing, the end-capping is a weld end-capping.
With reference to the second aspect and the foregoing implementation manners, in certain implementation manners of the second aspect, the preset vacuum degree is 0.01Pa, and the step of heating the hot isostatic pressing capsule to 180 ℃ to 220 ℃ for a preset time includes:
and heating the hot isostatic pressing sheath to 200 ℃, and carrying out heat preservation and pressure maintaining treatment for 2 hours when the vacuum degree reaches the preset vacuum degree.
With reference to the second aspect and the foregoing implementation manners, in some implementation manners of the second aspect, the step of subjecting the capped hipping capsule to hipping includes:
and carrying out hot isostatic pressing treatment on the hot isostatic pressing sheath, wherein the hot isostatic pressing temperature is 1160 ℃, and the hot isostatic pressing sheath is kept under the pressure of 170MPa for 2 hours.
The technical scheme provided in the embodiment of the invention has the following beneficial technical effects:
the alloy bar easy to machine provided by the invention is prepared by adopting a powder metallurgy process, the periphery of the alloy bar easy to machine is prepared by the first powder alloy, the segregation of alloy elements is avoided, and the segregation-free state of the alloy elements and the uniform distribution of microstructures can be kept after the densification of the hot isostatic pressing process, so that the alloy bar easy to machine has high wear resistance and good machining performance.
Additional aspects and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic cross-sectional view of an alloy bar that is easy to machine according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a method for manufacturing an easily machined alloy bar according to an embodiment of the present application.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Possible embodiments of the invention are given in the figures. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein by the accompanying drawings. The embodiments described by way of reference to the drawings are illustrative for the purpose of providing a more thorough understanding of the present disclosure and are not to be construed as limiting the present invention. Furthermore, if a detailed description of known technologies is not necessary for illustrating the features of the present invention, such technical details may be omitted.
It will be understood by those skilled in the relevant art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It is to be understood that the term "and/or" as used herein is intended to include all or any and all combinations of one or more of the associated listed items.
The technical solution of the present invention and how to solve the above technical problems will be described in detail with specific examples.
An embodiment of the first aspect of the present application provides an easily machinable alloy rod including a clad rod composed of a first alloy 10 and a core composed of a second alloy 20, the clad rod being disposed on a peripheral side of the core; in terms of mass fraction:
in the first alloy 10, the C% is 1.8-2.9, the Si% is 0.4-1.2, the Mn% is 0.2-0.9, the Cr% is 4-7.8, the Mo% is 0.8-4.0, the V% is 6.5-12, the S% is 0.1-0.5, the N% is 0.04-0.10, and the balance is Fe; in the second alloy 20, C% is 0.15-2.1. That is, the first alloy 10 contains 1.8-2.9% of carbon, 0.4-1.2% of silicon, 0.2-0.9% of manganese, 4-7.8% of chromium, 0.8-4.0% of molybdenum, 6.5-12% of vanadium, 0.1-0.5% of sulfur, 0.04-0.10% of nitrogen, and the balance of iron. The second alloy 20 may be carbon steel or low alloy steel, and contains carbon of 0.15% or more. In actual production, the above quality score is not a strict precise number and may fluctuate within a range that can be received.
Alternatively, as shown in fig. 1, one form of the alloy bar of the present invention may be a cylindrical bar. That is, in certain implementations of embodiments of the first aspect, the machinable alloy bar is cylindrical; the diameter of the alloy bar easy to machine is 30-400 mm, the diameter of the bar core is 20-300 mm, and the diameter of the bar core is smaller than that of the alloy bar easy to machine. By adopting the dimension specification, the alloy bar which is easy to machine and prepared by the preparation method provided by the application can better meet the set requirement, and also has good wear resistance and machinability.
Alternatively, in certain implementations of embodiments of the first aspect of the instant application, the second alloy 20 is 45# steel; in the first alloy 10, C% was 2.5, Si% was 0.8, Mn% was 0.5, Cr% was 5.25, Mo% was 4.0, V% was 9.75, S% was 0.2, and N% was 0.05.
In the components, C is dissolved in an iron matrix in a solid mode, so that the matrix strength of the material is improved, and meanwhile carbide is formed to improve the wear resistance. Part of N is dissolved in the matrix and part of N participates in the formation of the second phase. Mo is dissolved in the matrix in a solid mode, and the hardenability of the matrix is improved. Cr is mainly dissolved in the matrix in a solid manner, so that the hardenability is improved. V is mainly used for forming MC type carbide and improving the wear resistance. Si is a deoxidizer and a matrix strengthening element. S forms granular sulfides, and improves the processing performance of the elevator.
Embodiments of the second aspect of the present application provide a method for preparing an easily machinable alloy bar, the method for preparing an easily machinable alloy bar as described in embodiments of the first aspect of the present application, as shown in fig. 2, comprising the steps of:
s100: and placing a first alloy 10 in powder form and a second alloy rod core in a rod shape in the hot isostatic pressing capsule, wherein the second alloy rod core is arranged at the center of the hot isostatic pressing capsule, and the first alloy 10 is filled between the second alloy rod core and the inner wall of the hot isostatic pressing capsule. The hipping capsule may be made of metal or ceramic, such as mild steel, Ni, Mo, or glass.
S200: and vacuumizing and degassing the hot isostatic pressing sheath to a preset vacuum degree, heating the hot isostatic pressing sheath to 180-220 ℃, and preserving heat for a preset time.
S300: and carrying out hot isostatic pressing treatment on the capped hot isostatic pressing sheath, wherein the hot isostatic pressing treatment temperature is 1050-1250 ℃, the pressure is 120-200 MPa, and the pressure maintaining time is 1-3 hours.
S400: and cooling the hot isostatic pressing sheath along with the furnace to obtain the alloy bar easy to machine. And (4) carrying out hot isostatic pressing treatment on the hot isostatic pressing sheath obtained through the treatment in the previous step, cooling along with a furnace after alloy powder in the hot isostatic pressing sheath is completely compacted and tightly combined with the central bar, turning to remove the hot isostatic pressing sheath layer on the outer surface, and obtaining the alloy bar which is easy to machine and easy to machine. In addition, the obtained alloy bar which is easy to machine can be further forged or rolled to obtain the required specification and dimension.
Optionally, in certain implementations of the second aspect, the hot isostatic pressing capsule is a cylindrical hot isostatic pressing capsule with an open end, and the diameter of the hot isostatic pressing capsule is 30-400 mm. A cylindrical hot isostatic pressing sheath with an opening at one end can be taken, the diameter of the hot isostatic pressing sheath is 30-400 mm, a second alloy rod core is fixed at the center of the hot isostatic pressing sheath, the diameter of the second alloy rod core is 20-300 mm, the first alloy 10 in a powder state is filled in an annular gap between the second alloy rod core and the hot isostatic pressing sheath along the center, the first alloy 10 is compacted, and the duration of compaction operation is usually 40-60 minutes.
Optionally, with reference to the embodiment of the second aspect and the foregoing implementation manners, in another implementation manner of the embodiment of the second aspect, in the step of subjecting the capped hot isostatic pressing capsule to hot isostatic pressing, the end capping is a weld end capping. And carrying out vacuum degassing treatment on the hot isostatic pressing sheath, heating and preserving heat of the hot isostatic pressing sheath in the vacuum pumping process, continuing heating and preserving heat after degassing of the hot isostatic pressing sheath, and then carrying out sealing welding treatment on the end part of the hot isostatic pressing sheath.
Optionally, with reference to the second aspect and the foregoing implementation manners, in some implementation manners of the second aspect, the step of heating the hot isostatic pressing capsule to 180 ℃ to 220 ℃ for a predetermined time with a predetermined vacuum degree of 0.01Pa includes:
and heating the hot isostatic pressing sheath to 200 ℃, and performing heat preservation and pressure maintaining treatment for 2 hours when the vacuum degree reaches a preset vacuum degree.
Optionally, in some embodiments of the second aspect, the step of subjecting the capped hot isostatic pressing capsule to hot isostatic pressing comprises: and carrying out hot isostatic pressing treatment on the hot isostatic pressing sheath, wherein the hot isostatic pressing temperature is 1160 ℃, and the hot isostatic pressing sheath is kept under the pressure of 170MPa for 2 hours.
The technical scheme provided in the embodiment of the invention has the following beneficial technical effects:
the alloy bar easy to machine provided by the invention is prepared by adopting a powder metallurgy process, the periphery of the alloy bar easy to machine is prepared by the first powder alloy, the segregation of alloy elements is avoided, and the segregation-free state of the alloy elements and the uniform distribution of microstructures can be kept after the densification of the hot isostatic pressing process, so that the alloy bar easy to machine has high wear resistance and good machining performance.
The following are specific examples:
example (b):
the two types of alloys are compounded, namely a type metal and b type metal. The alloy of type a is in a powder state, and the optional alloy components are shown in the table 1:
TABLE 1 composition of alloy
The type b metal is in the form of a bar, and 45# steel can be selected. The hot isostatic pressing sheath may be made of mild steel.
The preparation method of the alloy bar easy to machine comprises the following steps:
first, alloy powder of the composition combination of No. 1 in table 1 was selected as the a alloy, and a rod material of 45# steel was selected as the b alloy.
Secondly, taking a cylindrical hot isostatic pressing sheath with an opening at one end, wherein the diameter of the hot isostatic pressing sheath is 80mm, the center of the hot isostatic pressing sheath is fixedly provided with a b alloy bar, the diameter of the b alloy bar at the center is 40mm, filling a alloy powder into an annular gap between the b alloy bar and the hot isostatic pressing sheath, and performing compaction operation on the a alloy powder for 50 minutes;
and thirdly, after the powder filling is finished, vacuumizing and degassing the hot isostatic pressing sheath, and heating and keeping the temperature of the hot isostatic pressing sheath at 200 ℃ in the vacuumizing process. And after the hot isostatic pressing sheath is degassed to 0.01Pa, continuing heating and insulating for 2h, and then sealing and welding the opening end part of the hot isostatic pressing sheath.
And hot isostatic pressing treatment is carried out on the sealed and welded hot isostatic pressing sheath, the hot isostatic pressing temperature is selected to be 1160 ℃, after the hot isostatic pressing sheath is kept under the pressure of 170MPa for 2 hours, the alloy powder a in the hot isostatic pressing sheath is completely and compactly consolidated and is tightly combined with the alloy bar b at the central position, and furnace cooling is carried out.
And finally, turning the obtained rough material of the alloy bar easy to machine, and removing the hot isostatic pressing coating layer on the outer surface of the alloy bar easy to machine to obtain the alloy bar easy to machine.
The hot isostatic pressed composite alloy bar may be further forged or rolled to obtain the required dimensions.
Those of skill in the art will appreciate that the various operations, methods, steps in the processes, acts, or solutions discussed in this application can be interchanged, modified, combined, or eliminated. Further, other steps, measures, or schemes in various operations, methods, or flows that have been discussed in this application can be alternated, altered, rearranged, broken down, combined, or deleted. Further, steps, measures, schemes in the prior art having various operations, methods, procedures disclosed in the present application may also be alternated, modified, rearranged, decomposed, combined, or deleted.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Claims (8)
1. An easily machined alloy bar is characterized by comprising a sheath bar with a first alloy and a bar core with a second alloy, wherein the sheath bar is arranged on the periphery of the bar core; in terms of mass fraction:
in the first alloy, the content of C is 1.8-2.9, the content of Si is 0.4-1.2, the content of Mn is 0.2-0.9, the content of Cr is 4-7.8, the content of Mo is 0.8-4.0, the content of V is 6.5-12, the content of S is 0.1-0.5, the content of N is 0.04-0.10, and the balance is Fe;
in the second alloy, the content of C is 0.15-2.1%.
2. The machinable alloy bar of claim 1, wherein the machinable alloy bar is cylindrical; the diameter of the alloy bar easy to machine is 30-400 mm, the diameter of the bar core is 20-300 mm, and the diameter of the bar core is smaller than that of the alloy bar easy to machine.
3. The machinable alloy bar of claim 1, wherein the second alloy is 45# steel; in the first alloy, C% was 2.5, Si% was 0.8, Mn% was 0.5, Cr% was 5.25, Mo% was 4.0, V% was 9.75, S% was 0.2, and N% was 0.05.
4. A method for preparing an easily machinable alloy bar according to any one of claims 1 to 3, comprising the steps of:
placing a first alloy in powder form and a second alloy rod core in a rod shape in a hot isostatic pressing capsule, wherein the second alloy rod core is arranged in the center of the hot isostatic pressing capsule, and the first alloy is filled between the second alloy rod core and the inner wall of the hot isostatic pressing capsule;
vacuumizing and degassing the hot isostatic pressing sheath to a preset vacuum degree, and heating the hot isostatic pressing sheath to 180-220 ℃ and preserving heat for a preset time;
performing hot isostatic pressing treatment on the capped hot isostatic pressing sheath, wherein the hot isostatic pressing treatment temperature is 1050-1250 ℃, the pressure is 120-200 MPa, and the pressure maintaining time is 1-3 hours;
and cooling the hot isostatic pressing sheath along with the furnace to obtain the alloy bar easy to machine.
5. The method of making a machinable alloy bar of claim 4, wherein the hot isostatic pressing capsule is a cylindrical hot isostatic pressing capsule open at one end, and the diameter of the hot isostatic pressing capsule is 30-400 mm.
6. The method of making a machinable alloy bar of claim 4, wherein the step of hot isostatic pressing the hot isostatic pressing capsule after termination is a weld termination.
7. The method of claim 4, wherein the predetermined vacuum is 0.01Pa, and the step of heating the hot isostatic pressing capsule to 180 ℃ to 220 ℃ for a predetermined time comprises:
and heating the hot isostatic pressing sheath to 200 ℃, and carrying out heat preservation and pressure maintaining treatment for 2 hours when the vacuum degree reaches the preset vacuum degree.
8. The method of making a machinable alloy bar of claim 4, wherein the step of hot isostatic pressing the capped hot isostatic pressing capsule comprises:
and carrying out hot isostatic pressing treatment on the hot isostatic pressing sheath, wherein the hot isostatic pressing temperature is 1160 ℃, and the hot isostatic pressing sheath is kept under the pressure of 170MPa for 2 hours.
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Application publication date: 20210611 |