CN108642402A - Novel aluminum nitride dispersion-strengtherning powder metallurgy aluminium high-speed steel and preparation method thereof - Google Patents
Novel aluminum nitride dispersion-strengtherning powder metallurgy aluminium high-speed steel and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of novel aluminum nitride dispersion-strengtherning powder metallurgy aluminium high-speed steel and preparation method thereof.Aluminium high-speed steel prepared by invention is introduced using the direct preparation process of novel powder metallurgy high-speed steel（0.05‑5.0）AlN micro mists, mixture passes through wet-milling, granulation, cold isostatic compaction, hydrogen deoxidation, hot pressing is complex sintered and the techniques such as vacuum heat, realize the micron order Dispersed precipitate of aluminum nitride particle, it overcomes and easily occurs ledeburite organization in conventional casting techniques, and aerosolization hot isostatic pressing method the shortcomings of being difficult to introduce aluminium nitride hardening constituent, it is short with technological process, production cost is low, impurity content is low, consistency is high, and wearability, anti-oxidant and microscopic structure all significantly improves after introducing aluminium nitride, it is a kind of tool die material novel between conventional high rate steel and hard alloy and ceramic material.
Description
Technical field
The present invention relates to a kind of novel powder metallurgy high-speed steel, i.e. aluminium nitride dispersion strengthening type resistance to oxidation powder metallurgy aluminium is high
Fast steel, with and preparation method thereof and near-net-shape technique.
Technical background
High-speed steel can be divided into high-end PM HSS and two kinds of high-speed steel is forged in common casting, after the former is due to eliminating
Coarse segregation microscopic structure present in person has fine and uniformly distributed carbide, thus with anisotropy and excellent
Comprehensive mechanical property.But China does not have the production capacity of high-end PM HSS so far.This is mainly due to it
Production procedure compared with long, equipment investment is big, technical threshold is high, be related to the core equipments such as electroslag remelting, aerosolization and hot isostatic pressing with
Technology.Nowadays, PM HSS has been passed by three generations, and the optimization of impurity content and alloying scheme is the key point of upgrading.
Casting wrought aluminium high-speed steel is a kind of novel high speed steel that China is independently invented, but high without aluminium nitride enhanced type aluminium so far
Fast steel.Aluminium has the function of similar cobalt element, that is, increases the diffusivity of carbon, improve steel belt roof bolt post-curing, improve
Martensite transformation temperature and raising red hardness etc., such as the 6W-5Mo-4Cr-2V-Al of river smelting.For another example Chinese invention patent CN
The aluminium boron high-speed steels such as 106086587 A, CN 101797630A and CN 102925820A mostly use greatly smelting scrap steel-casting-
Heat treatment production, cost of material but also reduce the comprehensive performance of material while reduction, be only applicable to the machinings such as roll neck
Domain, and the Powder High-speed Steels material in the present invention has impurity content low, short technological process, low equipment investment can be obtained
The high-strength hard tool materials of height with more application fields, and the wearability of conventional aluminum high-speed steel is far from meeting tool and mould
Requirement of the material to wearability, there are three types of solution routes：The first, the alloying element content for increasing high-speed steel, such as ASP2060 powder
Last low-alloyed high speed steel etc.；Second, it introduces Hard Inclusion and strengthens, such as TiC, AlN；Third further increases the red hardness of high-speed steel
And inoxidizability, improve its high-temperature service ability.
AlN belongs to covalent bond crystal, and in standard state, the decomposition temperature of AlN is 2708K, has hot steady well
It is qualitative, it is believed that AlN does not have fusing point at normal atmospheric pressure.And AlN is that a kind of hardness is higher and be difficult to Fe and its liquid phase
The hard phase that a large amount of diffusion reactions occur and are stabilized relatively is expected to improve steel simultaneously if be introduced into high-speed steel
Wearability and inoxidizability optimize the service ability of conventional high rate steel significantly.Prior powder metallurgy high-speed steel is since there are vacuum
The gentle atomization procedure of melting-electroslag remelting, when introducing high-melting-point Hard Inclusion or more alloying element, required higher fusing temperature
Degree makes existing equipment (heat-resistant piece bearing temperature is generally less than 1850 DEG C) be difficult to be completely melt and be atomized molten steel.Thus, traditional powder
Last low-alloyed high speed steel, which is difficult to introduce AlN particles, to be strengthened, and using high-speed steel atomized alloy powder and the mixing of AlN powder after
When carrying out super solid phase liquid-phase sintering, easily occur alloy ledeburite and AlN particles along crystal boundary chainlike distribution, cause the tough of material
Impatient acute deterioration.
In conjunction with above-mentioned analysis, it is necessary to find a kind of method uniformly introducing AlN particles in high-speed steel.The present invention uses
The direct preparation process of novel powder metallurgy high-speed steel (DFT) is expected to the chainlike distribution for avoiding AlN in high-speed steel, realizes aluminium member
Element and solution strengthening of the nitrogen to iron-based body, while improving the wearability and inoxidizability of novel powder metallurgy high-speed steel.In addition,
The introducing of AlN particles is also expected to inhibit the solution modeling mechanism of austenite grain grown up with carbide, and then thinning microstructure, expands
The heat treatment window of big high-speed steel and reduce its heat treatment overheat tendency.
Invention content
It is an object of the invention to develop a kind of novel aluminum nitride dispersion strengthening type resistance to oxidation powder metallurgy aluminium high-speed steel,
Make its meet requirement of the people to Powder High-speed Steels high-wearing feature and high antioxidant in modern industry, further expand its
The application in tool and mould field.
The present invention is to prepare this novel high speed steel, it is also proposed that one kind being totally different from traditional aerosolization-hot isostatic pressing stream
The novel DFT techniques of journey, the technique have the characteristics that can near-net-shape, flow is short, pollution is small, less energy consumption, production cost are low, and
It is easily introduced hardening constituent, no molten alloyization limitation.The technique is by mixture wet-milling, granulation, compression moulding, hydrogen ＆ pressure sinterings
And vacuum heat and etc. composition.Specifically realized according to following technical scheme：
A kind of novel aluminum nitride dispersion-strengtherning Al powder high speed steel material, it is characterised in that：Its raw material elemental percentage contains
Amount is respectively：(2.0~12.0) W, (2.0~12.0) Mo, (2.0~20.0) Cr, (0.2~10) V, (1.0~15.0) Co,
(0.8-3.2) C, (23.8~91.95) Fe, and (0.05-4.0) AlN micro mists are added, raw material with high-purity carbonyl iron dust, cobalt powder,
The metal powders such as hydrocarbon black powder, tungsten carbide, molybdenum carbide, vanadium carbide, chromium carbide, aluminium nitride are added, and particle size range is that 0.05-10 is micro-
Rice, the oxygen content of powder are respectively less than 0.1%, and using stearic acid as binder.
The invention also discloses a kind of preparation method of novel aluminum nitride dispersion-strengtherning Al powder high speed steel material, features
It is what the ingredient aluminium high-speed steel was completed by following steps：
Step 1：Component proportioning as described in claim 1 weighs raw material powder, unifies 80 mesh sieve, and hand mix
Uniformly；
Step 2：Mixing powder is added in tumbling ball mill, Material quality of grinding balls be zirconia ball or sintered carbide ball,
Ball-milling medium is alcohol or n-hexane, ratio of grinding media to material 2:1~5:1, mixture of powders slurry is made in Ball-milling Time 24-32 hours；
Step 3：Mixture slurry is poured into homemade agitated dryer and is stirred drying, drying temperature is 75~95
℃；Powder is put into wiping sieve comminutor later, 1% stearic acid is added and suitable alcohols wipe sieving and are granulated；
Step 4：Premixing powder obtained by step 3 is designed into mold according to shape of product, pressing pressure is 150~
400Mpa；
Step 5：Powder compact is put into hydrogen furnace and carries out degreasing and deoxidation pre-burning；Then pressure is transported in protective atmosphere
Base carries out pressure sintering to argon pressurization low-pressure sintering furnace, and 1100-1250 DEG C of sintering temperature keeps the temperature 30-180 minutes, sintering pressure
Power is 10-40Mpa, to realize the full densification sintering of product；
Step 6：Blank preheats in vacuum sintering furnace by 850 DEG C of level-ones after being sintered, 1100~1200 DEG C of heat preservations one
It fixes time, then in 550 DEG C of grade quenches, oil cooling to room temperature carries out 560-580 DEG C of tempering three times later, and no less than 1 is small every time
When.
As a further refinement of the present invention, hydrogen degreasing and deoxidation sintering process are to ensure that green body is extremely low in step 5
Oxygen content and fully dense key, for the skimming temp used for 350-450 DEG C, deoxidation temperature is 800-1000 DEG C.
The aluminium nitride dispersion strengthening type powder metallurgy aluminium-containing high speed steel material of above-mentioned preparation can using powder pressing forming
It is low and the problem of be difficult to near-net-shape to improve prior powder metallurgy high-speed steel profile material utilization rate, realize the nearly end of workpiece
Shape is standby, greatly increases stock utilization and reduces the processing cost of workpiece, is suffered from the fields such as tool and mould and mechanical processing
It is widely applied.
The principle of the present invention and advantageous effect are：
1, the introducing of AlN particles is expected to inhibit the solution modeling mechanism of austenite grain grown up with carbide, Jin Erxi
Change tissue expands the heat treatment window of high-speed steel and reduces its heat treatment overheat tendency, while using the compound burning of hydrogen pressurization
Knot technology, can take the lead in realize aluminum nitride particle dispersion-strengtherning powder metallurgy aluminium high-speed steel preparation, have short route, high efficiency,
Have excellent performance, near-net-shape the features such as.
2, a kind of direct preparation process of novel powder metallurgy high-speed steel (DFT) is used, effectively prevents AlN in high-speed steel
In chainlike distribution, and realize the solution strengthening of aluminium element and nitrogen to iron-based body, improve novel powder metallurgy high-speed steel
Wearability and inoxidizability.
3, aluminium nitride reinforced aluminum high-speed steel has the mechanics between conventional high rate steel and hard alloy and ceramic material
Performance and wearability, therefore, the performance blank being expected between filling high-speed steel, hard alloy and cermet.Meanwhile it is different
The other compositions high-speed steel of nitridation aluminium content is also convenient for developing and try out.
4, the easy mass production of production technology is suppressed using powder metallurgy near-net-shape and is sintered flow, breaks away from conventional add
Spare time amount with disadvantage of high cost, realizes the efficient of aluminium nitride reinforced aluminum high speed steel material, mass, low cost, Multiple Shape greatly
And near-net-shape manufacture.
Description of the drawings
Fig. 1 is different AlN contents powder metallurgy aluminium high-speed steel oxidation weight gain curves
Fig. 2 is the aluminium high-speed steel heat treatment state microscopic structure SEM photograph prepared in embodiment 1
Fig. 3 is the aluminium high-speed steel heat treatment state microscopic structure SEM photograph prepared in embodiment 2
Fig. 4 is the aluminium high-speed steel heat treatment state microscopic structure SEM photograph prepared in embodiment 3
Fig. 5 is the aluminium high-speed steel heat treatment state microscopic structure SEM photograph prepared in embodiment 4
Fig. 6 is the aluminium high-speed steel heat treatment state microscopic structure SEM photograph prepared in embodiment 5
Specific implementation mode：
Illustrate that the preparation method of the present invention and processing performance, those skilled in the art can by particular specific embodiment below
Advantages of the present invention and effect are comprehensively understood by content disclosed in the present specification.
Embodiment 1：
1) it is 0.05-10 microns by granularity, and oxygen content is respectively less than 0.1% 6.39wt.%WC powder, 5.31wt.%
Mo2C powder, 4.62wt.%Cr3C2Powder, 3.71wt.%VC powder, 8.0wt.%Co powder, 0.05wt.%AlN powder, 1.21wt.% carbon
Powder and 70.71wt.% carbonyl iron dusts carry out Wet blend-milling in tumbling ball mill, and ball-milling medium is absolute ethyl alcohol, hard
Alloying pellet is abrading-ball, ratio of grinding media to material 4:1, mixture of powders slurry is prepared in Ball-milling Time 24 hours；
2) step 1 gained mixed-powder slurry is stirred drying, 75 DEG C of temperature, until liquid in agitated dryer
Powder is put into wipes sieve comminutor later by all evaporations, and 1% stearic acid is added and suitable alcohols carry out wiping sieve granulation；
3) by mixed-powder, 300Mpa is suppressed under mo(u)ldenpress, dwell time 30s, carries out hydrogen degreasing, deoxidation later
After pre-burning, pressure sintering is carried out, 1140 DEG C of sintering temperature keeps the temperature 150 minutes, sintering pressure 30Mpa；
4) it is heat-treated：Heat treatment process is：850 DEG C of level-one preheatings, 1160 DEG C of held for some time, 550 DEG C of grade quenches,
Oil cooling is to room temperature, and 580 DEG C are tempered three times, every time tempering 1 hour.It obtains required aluminium nitride dispersion strengthening type powder metallurgy and contains aluminium
High-speed steel；
5 groups of aluminium high speed steel samples obtained will be tested for the property according to the method described above, test result as shown in table 1, oxygen
Change is weightless as shown in Figure 1, microscopic structure is as shown in Figure 2.
Embodiment 2：
1) it is 0.05-10 microns by granularity, and oxygen content is respectively less than 0.1% 10.66wt.%WC powder, 5.31wt.%
Mo2C powder, 3.46wt.%Cr3C2Powder, 11.74wt.%VC powder, 9.0wt.%Co powder, 0.25wt.%AlN powder, 3.2wt.% carbon
Powder and 56.23wt.% carbonyl iron dusts carry out Wet blend-milling in tumbling ball mill, and ball-milling medium is absolute ethyl alcohol, hard
Alloying pellet is abrading-ball, ratio of grinding media to material 3:1, mixture of powders slurry is prepared in Ball-milling Time 26 hours；
2) step 1 gained mixed-powder slurry is stirred drying, 80 DEG C of temperature, until liquid in agitated dryer
Powder is put into wipes sieve comminutor later by all evaporations, and 1% stearic acid is added and suitable alcohols carry out wiping sieve granulation；
3) by mixed-powder, 280Mpa is suppressed under mo(u)ldenpress, dwell time 30s, carries out hydrogen degreasing, deoxidation later
After pre-burning, pressure sintering is carried out, 1120 DEG C of sintering temperature keeps the temperature 120 minutes, sintering pressure 28Mpa；
4) it is heat-treated：Heat treatment process is：850 DEG C of level-one preheatings, 1200 DEG C of held for some time, 550 DEG C of grade quenches,
Oil cooling is to room temperature, and 570 DEG C are tempered three times, every time tempering 1 hour.It obtains required aluminium nitride dispersion strengthening type powder metallurgy and contains aluminium
High-speed steel；
It 5 groups of aluminium high speed steel samples obtained will be tested for the property according to the method described above, test result is as shown in table 1, shows
Micro-assembly robot is as shown in Figure 3.
Embodiment 3：
The present embodiment takes technical solution below：
1) it is 0.05-10 microns by granularity, and oxygen content is respectively less than 0.1% 2.13wt.%WC powder, 3.19wt.%
Mo2C powder, 9.23wt.%Cr3C2Powder, 6.18wt.%VC powder, 2.0wt.%Co powder, 5.0wt.%AlN powder, 0.8wt.% carbon dusts
And 71.47wt.% carbonyl iron dusts carry out wet-milling mixing in tumbling ball mill, ball-milling medium is absolute ethyl alcohol, and hard closes
Gold goal is abrading-ball, ratio of grinding media to material 2:1, mixture of powders slurry is prepared in Ball-milling Time 27 hours；
2) step 1 gained mixed-powder slurry is stirred drying, 75 DEG C of temperature, until liquid in agitated dryer
All evaporations, are added 1% stearic acid later and suitable alcohols carry out wiping sieve granulation；
3) by mixed-powder, 400Mpa is suppressed under mo(u)ldenpress, dwell time 30s, carries out hydrogen degreasing, deoxidation later
After pre-burning, pressure sintering is carried out, 1130 DEG C of sintering temperature keeps the temperature 120 minutes, sintering pressure 20Mpa；
4) it is heat-treated：Heat treatment process is：850 DEG C of level-one preheatings, 1120 DEG C of held for some time, 550 DEG C of grade quenches,
Oil cooling is to room temperature, and 560 DEG C are tempered three times, every time tempering 1 hour.It obtains required aluminium nitride dispersion strengthening type powder metallurgy and contains aluminium
High-speed steel；
It 5 groups of aluminium high speed steel samples obtained will be tested for the property according to the method described above, test result is as shown in table 1, shows
Micro-assembly robot is as shown in Figure 4.
Embodiment 4：
1) it is 0.05-10 microns by granularity, and oxygen content is respectively less than 0.1% 12.79wt.%WC powder, 6.38wt.%
Mo2C powder, 23.07wt.%Cr3C2Powder, 5.31wt.%VC powder, 10.0wt.%Co powder, 2.5wt.%AlN powder, 1.41wt.% carbon
Powder and 38.54wt.% carbonyl iron dusts carry out Wet blend-milling in tumbling ball mill, and ball-milling medium is absolute ethyl alcohol, hard
Alloying pellet is abrading-ball, ratio of grinding media to material 5:1, mixture of powders slurry is prepared in Ball-milling Time 30 hours；
2) step 1 gained mixed-powder slurry is stirred drying, 80 DEG C of temperature, until liquid in agitated dryer
Powder is put into wipes sieve comminutor later by all evaporations, and 1% stearic acid is added and suitable alcohols carry out wiping sieve granulation；
3) by mixed-powder, 360Mpa is suppressed under mo(u)ldenpress, dwell time 30s, carries out hydrogen degreasing, deoxidation later
After pre-burning, pressure sintering is carried out, 1180 DEG C of sintering temperature keeps the temperature 180 minutes, sintering pressure 26Mpa；
4) it is heat-treated：Heat treatment process is：850 DEG C of level-one preheatings, 1180 DEG C of held for some time, 550 DEG C of grade quenches,
Oil cooling is to room temperature, and 570 DEG C are tempered three times, every time tempering 1 hour.It obtains required aluminium nitride dispersion strengthening type powder metallurgy and contains aluminium
High-speed steel；
It 5 groups of aluminium high speed steel samples obtained will be tested for the property according to the method described above, test result is as shown in table 1, shows
Micro-assembly robot is as shown in Figure 5.
Embodiment 5：
1) it is 0.05-10 microns by granularity, and oxygen content is respectively less than 0.1% 9.59wt.%WC powder, 10.63wt.%
Mo2C powder, 12.12wt.%Cr3C2Powder, 0.62wt.%VC powder, 4.2wt.%Co powder, 3.8wt.%AlN powder, 2.2wt.% carbon dusts
And 56.84wt.% carbonyl iron dusts carry out Wet blend-milling in tumbling ball mill, ball-milling medium is absolute ethyl alcohol, and hard closes
Gold goal is abrading-ball, ratio of grinding media to material 3:1, mixture of powders slurry is prepared in Ball-milling Time 32 hours；
2) step 1 gained mixed-powder slurry is stirred drying, 88 DEG C of temperature, until liquid in agitated dryer
Powder is put into wipes sieve comminutor later by all evaporations, and 1% stearic acid is added and suitable alcohols carry out wiping sieve granulation；
3) by mixed-powder, 150Mpa is suppressed under mo(u)ldenpress, dwell time 30s, carries out hydrogen degreasing, deoxidation later
After pre-burning, pressure sintering is carried out, 1200 DEG C of sintering temperature keeps the temperature 120 minutes, sintering pressure 35Mpa；
4) it is heat-treated：Heat treatment process is：850 DEG C of level-one preheatings, 1100 DEG C of held for some time, 550 DEG C of grade quenches,
Oil cooling is to room temperature, and 575 DEG C are tempered three times, every time tempering 1 hour.It obtains required aluminium nitride dispersion strengthening type powder metallurgy and contains aluminium
High-speed steel；
It 5 groups of aluminium high speed steel samples obtained will be tested for the property according to the method described above, test result is as shown in table 1, shows
Micro-assembly robot is as shown in Figure 6.
Comparative example 1：
The addition of AlN is only adjusted to 4.0wt.% in comparative example 1, the addition of carbonyl iron dust is adjusted to
The weight percent of 66.76wt.%, remaining carbide powder and elemental powders is in the same manner as in Example 1, preparation process, reality
It is in the same manner as in Example 1 to test parameter selection etc.；
To test 5 groups of aluminium high speed steel samples obtained according to the method described above, the results are shown in Table 1, oxidation weight loss such as
Fig. 2.
Comparative example 2：
The addition of AlN is only adjusted to 0wt.% in comparative example 2, the addition of carbonyl iron dust is adjusted to
The weight percent of 70.76wt.%, remaining carbide powder and elemental powders is in the same manner as in Example 1, preparation process, reality
It is in the same manner as in Example 1 to test parameter selection etc.；
It will test 5 groups of high-speed steel alloy samples obtained according to the method described above, the results are shown in Table 1, oxidation weight loss
As shown in Figure 2.
The performance test of aluminium high-speed steel after heat treatment in 1 embodiment of table
Claims (4)
1. a kind of novel aluminum nitride dispersion-strengtherning powder metallurgy aluminium high speed steel material, it is characterised in that：Its raw material elemental percentage
Content is respectively：（2.0~12.0）W,（2.0~12.0）Mo,（2.0~20.0）Cr,（0.2~10）V,（1.0~15.0）Co,（0.8~
3.2）C,（23.8~91.95）Fe, and be added（0.05~5.0）AlN micro mists, raw material are with high-purity carbonyl iron dust, cobalt powder, carbon powder
The metal powders such as end, tungsten carbide, molybdenum carbide, vanadium carbide, chromium carbide, aluminium nitride are added, and particle size range is 0.05 ~ 10 micron, powder
The oxygen content at end is respectively less than 0.1%, and using stearic acid as binder；What preparation method was specifically realized by the following steps：
Step 1：Composition proportion as described in claim 1 weighs raw material powder, unifies 80 mesh sieve, and hand mix is equal
It is even；
Step 2：Mixing powder is added in tumbling ball mill, Material quality of grinding balls is zirconia ball or sintered carbide ball, ball milling
Medium is alcohol or n-hexane, ratio of grinding media to material 2:1~5:1, mixture of powders slurry is made in Ball-milling Time 24-32 hours；
Step 3：Mixture slurry is poured into homemade agitated dryer and is stirred drying, drying temperature is 75 ~ 95 DEG C；It
Powder is put into wiping sieve comminutor afterwards, 1% stearic acid is added and suitable alcohols wipe sieving and are granulated；
Step 4：Premixing powder obtained by step 3 is designed into mold according to shape of product, pressing pressure is 150 ~ 400Mpa；
Step 5：Powder compact is put into hydrogen furnace and carries out degreasing and deoxidation pre-burning；Then green compact is transported extremely in protective atmosphere
Argon pressurization low-pressure sintering furnace, carries out pressure sintering, and 1100-1250 DEG C of sintering temperature keeps the temperature 30-180 minutes, sintering pressure
For 10-40Mpa, to realize the full densification sintering of product；
Step 6：Blank preheats in vacuum sintering furnace by 850 DEG C of level-ones after being sintered, 1100 ~ 1200 DEG C of one timings of heat preservation
Between, then in 550 DEG C of grade quenches, oil cooling to room temperature carries out 560-580 DEG C of tempering three times later, no less than 1 hour every time.
2. a kind of preparation method of novel aluminum nitride dispersion-strengtherning powder metallurgy aluminium high speed steel material, it is characterised in that specifically press
What following steps were completed：
Step 1：Component proportioning as described in claim 1 weighs raw material powder, unifies 80 mesh sieve, and hand mix is equal
It is even；
Step 2：Mixing powder is added in tumbling ball mill, Material quality of grinding balls is zirconia ball or sintered carbide ball, ball milling
Medium is alcohol or n-hexane, ratio of grinding media to material 2:1~5:1, mixture of powders slurry is made in Ball-milling Time 24-32 hours；
Step 3：Mixture slurry is poured into homemade agitated dryer and is stirred drying, drying temperature is 75 ~ 95 DEG C；It
Powder is put into wiping sieve comminutor afterwards, 1% stearic acid is added and suitable alcohols wipe sieving and are granulated；
Step 4：Premixing powder obtained by step 3 is designed into mold according to shape of product, pressing pressure is 150 ~ 400Mpa；
Step 5：Powder compact is put into hydrogen furnace and carries out degreasing and deoxidation pre-burning；Then green compact is transported extremely in protective atmosphere
Argon pressurization low-pressure sintering furnace, carries out pressure sintering, and 1100-1250 DEG C of sintering temperature keeps the temperature 30-180 minutes, sintering pressure
For 10-40Mpa, to realize the full densification sintering of product；
Step 6：Blank preheats in vacuum sintering furnace by 850 DEG C of level-ones after being sintered, 1100 ~ 1200 DEG C of one timings of heat preservation
Between, then in 550 DEG C of grade quenches, oil cooling to room temperature carries out 560-580 DEG C of tempering three times later, no less than 1 hour every time.
3. the preparation method of alloy according to claim 1, which is characterized in that hydrogen degreasing and deoxidation agglomerant in step 5
Skill is to ensure the extremely low oxygen content of green body and fully dense key, and the skimming temp used is 350-450 DEG C, deoxidation temperature 800-
1000℃。
4. the material prepared by claim 1, which is characterized in that use powder pressing forming, conventional powder can be improved
The problem of low-alloyed high speed steel profile material utilization rate is low and is difficult to near-net-shape is realized prepared by the nearly end form of workpiece, is greatly increased
Stock utilization and the processing cost for reducing workpiece are suffered from the fields such as tool and mould and mechanical processing and are widely applied.
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