CN108359785A - A kind of strengthening and toughening treatment method of W6Mo5Cr4V2 high-speed steel broaches - Google Patents
A kind of strengthening and toughening treatment method of W6Mo5Cr4V2 high-speed steel broaches Download PDFInfo
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- CN108359785A CN108359785A CN201810224097.2A CN201810224097A CN108359785A CN 108359785 A CN108359785 A CN 108359785A CN 201810224097 A CN201810224097 A CN 201810224097A CN 108359785 A CN108359785 A CN 108359785A
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/22—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for drills; for milling cutters; for machine cutting tools
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- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
- C23C8/58—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions more than one element being applied in more than one step
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Abstract
The invention discloses a kind of strengthening and toughening treatment methods of W6Mo5Cr4V2 high-speed steel broaches, belong to alloy tool steel technical field of heat treatment technology, comprise the concrete steps that the first grade quench in salt bath of W6Mo5Cr4V2 high-speed steel broaches；High tempering 2 times；Then salt bath nitrocarburizing processing is carried out, temperature is 540~550 DEG C, and the time is 20~40min；Last liquid oxidizing processing, temperature are 350~380 DEG C, and the time is 20~30min, comes out of the stove and is cooled to room temperature；It repeats salt bath nitriding and liquid oxidizing step is multiple, improve diffusion layer depth.Invention increases the obdurability of W6Mo5Cr4V2 high-speed steel broaches, depth of penetration obviously increases, and effectively improves broaching tool case hardness, and the service life of broaching tool can improve 2~4 times；In addition, broaching tool is in use for some time, refacing property of blade is more preferable than an existing nitrogen treatment.
Description
Technical field
The invention belongs to alloy tool steel technical field of heat treatment technology, and in particular to a kind of W6Mo5Cr4V2 high-speed steel drawing
The strengthening and toughening treatment method of knife.
Background technology
W6Mo5Cr4V2 high-speed steel is due to its high rigidity, high-wearing feature, good thermal stability and red hardness, moderate cost
It is widely used for manufacturing various types of nonstandard broaching tools, such as spline broach, circular broach, keyway broach and polygonal broach.It is existing
The requirement of high cutting speed, high-precision, long-life and good reliability is proposed to high-speed steel tool height for manufacturing industry,
Therefore domestic and foreign scholars have been devoted to carry out Strengthening and Toughening processing to high-speed steel tool, improve hardness, increase obdurability, to prolong
The service life of long high-speed steel tool reduces production cost.There are two types of the main methods for improving high-speed steel Strengthening and Toughening：One, adjustment high speed
Steel chemical composition improves heat treatment process, improves the obdurability of high-speed steel itself.Two, surface of high speed steel intensive treatment, exploitation
The tough high-speed steel tool of table hard-core, as surface-coating technology, laser or ion beam surface Hardening Treatment, nitridation, vulcanization, molybdenum,
The Surface thermo-chemical treatments technology such as multicomponent thermochemical treatment.
Chinese invention patent (publication number CN 103805890A) discloses a kind of cutting tool high speed Heat-Treatment of Steel work
Skill, Chinese invention patent (publication number CN 101693943A) disclose high speed steel tool heat treatment method, Chinese invention patent
(publication number CN 103849739A) discloses a kind of cryogenic treating process of high-speed steel tool, three kinds of methods by adjusting
W6Mo5Cr4V2 high speeds steel chemical composition improves heat treatment process, to change carbide size in high-speed steel, form and divide
Cloth, to improve the hardness of high-speed steel itself.And 2 performance key indexes of the intensity (hardness) of high-speed steel and toughness be it is contradictory,
The raising of hardness is often to sacrifice toughness as cost.
In recent years, coated cutting tool have developed rapidly, by either physically or chemically high-speed steel tool surface deposit one layer or
Multi-layer composite coatings can effectively improve cutter hardness and wearability, so that cutter is had outer strong interior tough characteristic, high speed can be improved
3-6 times of steel cutter service life or higher.Typically " hard " coating material has diamond, TiC, TiN, TiCN, Al2O3And TiAlN
Deng.Chinese invention patent (publication number CN101591780) discloses a kind of preparation method of abrasion resistant coating layer of cutter, it is characterized in that adopting
It is oozed with plasma expansion and deposits complex technique, it is multiple to form N//TiN/TiC multi-gradients from inside to outside on high-speed steel tool surface
Close coating.Multi-layer composite coatings prepared by this method enhance high-speed steel tool, while capable of keeping cutter center toughness, improve
Intensity, hardness, wearability and the service life of tool surface.But existing coating technology not can be well solved coating with
The low problem of interface bond strength between matrix, coating easily peel off.Moreover, the refacing property of coated cutting tool is poor, equipment is expensive, preceding
Treatment process requirement is stringenter, of high cost, is suitable for valuable, precision cutting tool, such as cutter for gear wheel.
Chinese invention patent (publication number CN1594605A) discloses the intense pulsed ion beam processing of high-speed steel tool surface
Technology carries out high-speed steel tool surface treatment using Irradiated by High-intensity Pulsed Ion Beams, and combines subsequent subzero treatment, changes high
The institutional framework on fast steel cutter surface improves hardness, the wearability of high-speed steel tool, to improve cutting-tool's used life.It should
The superiority of method is obvious to all, but faces same be stranded with other Ion Beam Surface Modification technologies such as Laser Surface Treatments
Border, industrialized production are difficult.
Chinese invention patent (publication number CN 1616705A) discloses high-speed steel (W6Mo5Cr4V2) slide plate (or blade)
Bath nitriding processing, Chinese invention patent (publication number CN 101871087A) are disclosed to high-speed steel air conditioning compressor blade
Carry out salt bath nitriding treatment in salt bath formula and processing method, both methods be by W6Mo5Cr4V2 high-speed steel into
The processing of row salt bath nitriding, improves surface of high speed steel hardness, wearability, and service life increases substantially.Bath nitriding processing skill
Art is at low cost, strengthens significant effect, and performance is stablized, also big, the wide universal high speed steel cutter of the amount of being applicable to.The above high-speed steel
Surface strengthening treatment technology is all to carry out subsequent processing to finished tools to improve its performance and used life, processing step
It is more, consider that energy saving and production cost aspect is also undesirable.
Invention content
Goal of the invention：In view of the problems of the existing technology, the purpose of the present invention is to provide a kind of W6Mo5Cr4V2 high
The strengthening and toughening treatment method of fast steel broaching tool makes it have the tough feature of table hard-core, not only increases the comprehensive performance of material, and
It is saved greatly the energy and production cost.
For achieving the above object, the present invention adopts the following technical scheme that：
A kind of strengthening and toughening treatment method of W6Mo5Cr4V2 high-speed steel broaches, includes the following steps：
Step 1: grade quench, obtains quenched high-speed steel broach；
Step 2: high tempering：Quenched high-speed steel broach is tempered in salt bath furnace, is then air-cooled to room temperature, is pressed
This technique carries out 2 tempering, obtains the high-speed steel broach after high tempering；
Step 3: salt-bath nitriding：High-speed steel broach after high tempering is subjected to salt bath carbo-nitriding processing；
Step 4: liquid oxidizing：High-speed steel broach after salt bath nitriding treatment is put into oxidation salt bath furnace, cooling of coming out of the stove
To room temperature, the salt on surface is removed through water cleaning；
Step 5: polishing：High-speed steel broach surface is polished, surface porosity layer is removed.
Step 6: three, four, the five progress n times (n >=1) that repeat the above steps, improve depth of penetration, it is tough to obtain table hard-core
High-speed steel broach.
Steps are as follows for grade quench in the step one：
First by high-speed steel broach in 400~550 DEG C of air furnaces 2~4h of low-temperature prewarming, then in 850~870 DEG C of salt
Medium temperature preheats 10~20min in liquid furnace；Then 1200~1220 DEG C of hardening heat, soaking time are heated in High Temperature Salt Bath Furnace
10~18s/mm；Then the grade quench in salt bath, 500~550 DEG C of temperature, 10~18s/mm of time obtain quenched height
Fast steel broaching tool；
The temperature of the step two high temperature tempering is 560 DEG C；
Steps are as follows for salt-bath nitriding in the step three：
1) it cleans：High-speed steel broach is carried out to the salt on cleaning removal surface with water；
2) it preheats：Preheating temperature is 350~400 DEG C, and the time is 20~30min.It is in high-speed steel broach table to preheat purpose
Face forms very thin FeO films, promotes subsequent nitriding；
3) nitrogen treatment：High-speed steel broach is immersed in 540~550 DEG C of salt bath furnace and carries out nitrocarburizing processing, time
For 20~40min.
In the step three, when Nitrizing Treatment, the CNO in salt bath furnace-A concentration of 30~32%.
The step of liquid oxidizing of the step four is：High-speed steel broach after salt bath nitriding treatment is put into 350~
In 380 DEG C of oxidation salt bath furnaces, oxidization time is 20~30min.
Advantageous effect：Compared with prior art, the present invention is after low temperature salt-bath nitridation and liquid oxidizing processing, high speed
Steel surface forms Fe3O4The diffusion layer that oxide layer and nitrogen, carbon are dissolved in α-Fe, is effectively improved the hardness on surface, simultaneously
Maintain the toughness of broaching tool center portion；Meanwhile 560 DEG C of high-temperature tempering process are saved, high-speed steel broach is by salt bath several times
Nitrogen treatment, depth of penetration obviously increase, and effectively improve broaching tool case hardness, and the service life of broaching tool can improve 2~4 times；
In addition, broaching tool is in use for some time, refacing property of blade is more preferable than an existing nitrogen treatment.
Description of the drawings
Fig. 1 is the XRD spectrum of W6Mo5Cr4V2 surface of high speed steel；
Fig. 2 is W6Mo5Cr4V2 high-speed steel section gradient hardness number.
Specific implementation mode
By way of example and in conjunction with the accompanying drawings, technical solution of the present invention is specifically described, but the guarantor of the present invention
Shield range is not limited to the embodiment described.
A kind of strengthening and toughening treatment method of W6Mo5Cr4V2 high-speed steel broaches, is as follows：
Step 1: grade quench
First by high-speed steel broach in 400~550 DEG C of air furnaces 2~4h of low-temperature prewarming, then in 850~870 DEG C of salt
Medium temperature preheats 10~20min in liquid furnace；Then 1200~1220 DEG C of hardening heat, soaking time are heated in High Temperature Salt Bath Furnace
10~18s/mm；Then the grade quench in salt bath, 500~550 DEG C of temperature, 10~18s/mm of time obtain quenched height
Fast steel broaching tool；
Step 2: high tempering
Quenched high-speed steel broach is tempered 1h in 560 DEG C of salt bath furnaces, is then air-cooled to room temperature, is carried out by this technique
2 tempering, obtain the high-speed steel broach after high tempering；
Step 3: salt-bath nitriding
High-speed steel broach after high tempering is subjected to salt bath carbo-nitriding processing, method is as follows：
1) it cleans：High-speed steel broach is carried out to the salt on cleaning removal surface with water；
2) it preheats：Preheating temperature is 350~400 DEG C, and the time is 20~30min.It is in high-speed steel broach table to preheat purpose
Face forms very thin FeO films, promotes subsequent nitriding；
3) nitrogen treatment：Broaching tool to be immersed and carries out nitrocarburizing processing in 540~550 DEG C of salt bath furnace, the time is 20~
40min.CNO in salt bath furnace-Concentration is controlled 30~32% or so.
Step 4: liquid oxidizing
Broaching tool after salt bath nitriding treatment is put into 20~30min in 350~380 DEG C of oxidation salt bath furnaces, comes out of the stove and is cooled to
Room temperature.Water cleans 5~10min, removes the salt on surface.
Step 5: polishing
High-speed steel broach surface is polished, surface porosity layer is removed.
Step 6: three, four, the five progress n times (n >=1) that repeat the above steps, improve depth of penetration, it is tough to obtain table hard-core
High-speed steel broach.
Embodiment 1
The strengthening and toughening treatment method for the W6Mo5Cr4V2 high-speed steel spline broaches that size is 30 × 900mm of Φ is：
Step 1: grade quench：By high-speed steel broach in 500 DEG C of air furnaces low-temperature prewarming 2h；In 870 DEG C of salt bath furnaces
Medium temperature preheats 10min；1220 DEG C are heated in High Temperature Salt Bath Furnace, soaking time 5min；Then the grade quench in salt bath, temperature
550 DEG C of degree, time 5min.
Step 2: high tempering：Quenched high-speed steel broach is tempered 1h in 560 DEG C of salt bath furnaces, is then air-cooled to
Room temperature carries out 2 tempering by this technique.
Step 3: salt-bath nitriding：The high-speed steel broach that step 2 is handled carries out salt bath carbo-nitriding processing, method
It is as follows：(1) it cleans：High-speed steel broach is carried out to the salt on cleaning removal surface with water；(2) it preheats：Preheating temperature is 400 DEG C, when
Between be 20min；(3) nitrogen treatment：Broaching tool is immersed in 540 DEG C of salt bath furnace and carries out nitrocarburizing processing, time 40min.
CNO in salt bath-Concentration is controlled 32% or so.
Step 4: liquid oxidizing：Broaching tool after salt bath nitriding treatment is put into 30min in 350 DEG C of oxidation salt bath furnaces, is come out of the stove
It is cooled to room temperature.Water cleans 5min, removes the salt on surface.
Step 5: polishing：Broaching tool surface is polished, surface porosity layer is removed.
Step 6: three, four, five progress 1 time that repeats the above steps.
Embodiment 2
The strengthening and toughening treatment method for the W6Mo5Cr4V2 high-speed steel spline broaches that size is 30 × 900mm of Φ is：
Step 1：Grade quench：By high-speed steel broach in 500 DEG C of air furnaces low-temperature prewarming 2h；In 870 DEG C of salt bath furnaces
Medium temperature preheats 10min；1220 DEG C are heated in High Temperature Salt Bath Furnace, soaking time 5min；Then the grade quench in salt bath, temperature
550 DEG C of degree, time 5min.
Step 2：High tempering：Quenched high-speed steel broach is tempered 1h in 560 DEG C of salt bath furnaces, is then air-cooled to
Room temperature carries out 2 tempering by this technique.
Step 3：Salt-bath nitriding：The high-speed steel broach that step 2 is handled carries out salt bath carbo-nitriding processing, method
It is as follows：(1) it cleans：High-speed steel broach is carried out to the salt on cleaning removal surface with water；(2) it preheats：Preheating temperature is 400 DEG C, when
Between be 20min；(3) nitrogen treatment：Broaching tool is immersed in 540 DEG C of salt bath furnace and carries out nitrocarburizing processing, time 20min.
CNO in salt bath-Concentration is controlled 32% or so.
Step 4：Liquid oxidizing：Broaching tool after salt bath nitriding treatment is put into 30min in 350 DEG C of oxidation salt bath furnaces, is come out of the stove
It is cooled to room temperature.Water cleans 5min, removes the salt on surface.
Step 5：Polishing：Broaching tool surface is polished, surface porosity layer is removed.
Step 6: three, four, the five progress 2 subsurface Strengthening and Toughenings processing that repeat the above steps, improve depth of penetration.
Embodiment 3
The strengthening and toughening treatment method for the W6Mo5Cr4V2 high-speed steel spline broaches that size is 30 × 900mm of Φ is：
Step 1：Grade quench：By high-speed steel broach in 500 DEG C of air furnaces low-temperature prewarming 2h；In 870 DEG C of salt bath furnaces
Medium temperature preheats 10min；1220 DEG C are heated in High Temperature Salt Bath Furnace, soaking time 5min；Then the grade quench in salt bath, temperature
550 DEG C of degree, time 5min.
Step 2：High tempering：Quenched high-speed steel broach is tempered 1h in 560 DEG C of salt bath furnaces, is then air-cooled to
Room temperature carries out 2 tempering by this technique.
Step 3：Salt-bath nitriding：The high-speed steel broach that step 2 is handled carries out salt bath carbo-nitriding processing, method
It is as follows：(1) it cleans：High-speed steel broach is carried out to the salt on cleaning removal surface with water；(2) it preheats：Preheating temperature is 400 DEG C, when
Between be 20min；(3) nitrogen treatment：Broaching tool is immersed in 550 DEG C of salt bath furnace and carries out nitrocarburizing processing, time 20min.
CNO in salt bath-Concentration is controlled 32% or so.
Step 4：Liquid oxidizing：Broaching tool after salt bath nitriding treatment is put into 20min in 350 DEG C of oxidation salt bath furnaces, is come out of the stove
It is cooled to room temperature.Water cleans 5min, removes the salt on surface.
Step 5：Polishing：Broaching tool surface is polished, surface porosity layer is removed.
Step 6：Repeat the above steps three, four, five progress 2 subsurface Strengthening and Toughenings processing, improves depth of penetration.
Embodiment 4
The strengthening and toughening treatment method for the W6Mo5Cr4V2 high-speed steel spline broaches that size is 30 × 900mm of Φ is：
Step 1: grade quench：By high-speed steel broach in 500 DEG C of air furnaces low-temperature prewarming 2h；In 870 DEG C of salt bath furnaces
Medium temperature preheats 10min；1220 DEG C are heated in High Temperature Salt Bath Furnace, soaking time 5min；Then the grade quench in salt bath, temperature
550 DEG C of degree, time 5min.
Step 2: high tempering：Quenched high-speed steel broach is tempered 1h in 560 DEG C of salt bath furnaces, is then air-cooled to
Room temperature carries out 2 tempering by this technique.
Step 3: salt-bath nitriding：The high-speed steel broach that step 2 is handled carries out salt bath carbo-nitriding processing, method
It is as follows：(1) it cleans：High-speed steel broach is carried out to the salt on cleaning removal surface with water；(2) it preheats：Preheating temperature is 400 DEG C, when
Between be 20min；(3) nitrogen treatment：Broaching tool is immersed in 540 DEG C of salt bath furnace and carries out nitrocarburizing processing, time 25min.
CNO in salt bath-Concentration is controlled 32% or so.
Step 4: liquid oxidizing：Broaching tool after salt bath nitriding treatment is put into 20min in 380 DEG C of oxidation salt bath furnaces, is come out of the stove
It is cooled to room temperature.Water cleans 5min, removes the salt on surface.
Step 5: polishing：Broaching tool surface is polished, surface porosity layer is removed.
Step 6: three, four, five progress 2 times that repeats the above steps.
The XRD diagram spectrum analysis of the W6Mo5Cr4V2 high-speed steel of 4 surface Hardening Treatment of experimental example
Crystal species analysis is carried out to the W6Mo5Cr4V2 surface of high speed steel of the embodiment 1-3 surface Hardening Treatments provided,
The results are shown in Figure 1 for it.Studies have shown that after low temperature salt-bath nitridation and liquid oxidizing processing, surface of high speed steel forms
Fe3O4The diffusion layer that oxide layer and nitrogen, carbon are dissolved in α-Fe, has no compound layer, is effectively improved the hardness on surface, together
When maintain the toughness of broaching tool center portion.
The section gradient hardness test of the W6Mo5Cr4V2 high-speed steel of 5 surface Hardening Treatment of experimental example
Gradient hardness test is carried out to W6Mo5Cr4V2 high-speed steel section with microhardness testers (HVS-1000), as a result as schemed
Shown in 2.It is demonstrated experimentally that since C, N atom penetrate into high speed steel substrate, surface of high speed steel hardness significantly improves, from outward appearance to inner essence firmly
Graded is presented in degree, gradually decreases to high speed steel substrate hardness (950Hv0.1Left and right).The wherein gradient hardness number of embodiment 2
Highest, case hardness reach 1420Hv0.1More than, depth of penetration is more than 70 μm.
In conclusion a kind of strengthening and toughening treatment method of W6Mo5Cr4V2 high-speed steel broaches provided by the invention, high-speed steel
Broaching tool is obviously increased by salt bath nitriding treatment, depth of penetration several times, effectively improves broaching tool case hardness, and broaching tool center portion is tough
Property remains unchanged.
Claims (6)
1. a kind of strengthening and toughening treatment method of W6Mo5Cr4V2 high-speed steel broaches, it is characterised in that include the following steps：
Step 1: grade quench, obtains quenched high-speed steel broach；
Step 2: high tempering：Quenched high-speed steel broach is tempered in salt bath furnace, is then air-cooled to room temperature, by this work
Skill carries out 2 tempering, obtains the high-speed steel broach after high tempering；
Step 3: salt-bath nitriding：High-speed steel broach after high tempering is subjected to salt bath carbo-nitriding processing；
Step 4: liquid oxidizing：High-speed steel broach after salt bath nitriding treatment is put into oxidation salt bath furnace, comes out of the stove and is cooled to room
Temperature removes the salt on surface through water cleaning；
Step 5: polishing：The high-speed steel broach surface that step 4 obtains is polished, surface porosity layer is removed.
Step 6: repeat the above steps three, four, five progress n times, wherein n >=1, improve depth of penetration, obtain the tough height of table hard-core
Fast steel broaching tool.
2. a kind of strengthening and toughening treatment method of W6Mo5Cr4V2 high-speed steel broaches according to claim 1, it is characterised in that：
In step 1, grade quench be first by high-speed steel broach in 400~550 DEG C of air furnaces 2~4h of low-temperature prewarming, then exist
Medium temperature preheats 10~20min in 850~870 DEG C of salt bath furnaces；Then be heated in High Temperature Salt Bath Furnace hardening heat 1200~
1220 DEG C, 10~18s/mm of soaking time；Then the grade quench in salt bath, 500~550 DEG C, 10~18s/mm of time of temperature,
Obtain quenched high-speed steel broach.
3. a kind of strengthening and toughening treatment method of W6Mo5Cr4V2 high-speed steel broaches according to claim 1, it is characterised in that：
In step 3, steps are as follows for salt-bath nitriding：
1) it cleans：High-speed steel broach is carried out to the salt on cleaning removal surface with water；
2) it preheats：Preheating temperature is 350~400 DEG C, and the time is 20~30min.It is in high-speed steel broach surface shape to preheat purpose
At very thin FeO films, promote subsequent nitriding；
3) nitrogen treatment：High-speed steel broach is immersed in 540~550 DEG C of salt bath furnace and carries out nitrocarburizing processing, time 20
~40min.
4. a kind of strengthening and toughening treatment method of W6Mo5Cr4V2 high-speed steel broaches according to claim 3, it is characterised in that：
CNO in the salt bath furnace-A concentration of 30~32%.
5. a kind of strengthening and toughening treatment method of W6Mo5Cr4V2 high-speed steel broaches according to claim 1, it is characterised in that：
In step 4, the high-speed steel broach after salt bath nitriding treatment is put into 20~30min in 380~400 DEG C of oxidation salt bath furnaces.
6. a kind of strengthening and toughening treatment method of W6Mo5Cr4V2 high-speed steel broaches according to claim 1, it is characterised in that：
In step 6, repeat the above steps three, four, five progress 2 times, improves depth of penetration.
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| CN109825689A (en) * | 2019-03-11 | 2019-05-31 | 湖北汽车工业学院 | A method of high solid solubility ultra-fine grain high-speed steel is prepared using electric pulse |
| CN111660145A (en) * | 2020-06-03 | 2020-09-15 | 山东理工大学 | Tool processing method for reducing metal processing cost |
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