CN108220562B - A kind of mould steel phase transformation heat treatment method - Google Patents
A kind of mould steel phase transformation heat treatment method Download PDFInfo
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- CN108220562B CN108220562B CN201810015037.XA CN201810015037A CN108220562B CN 108220562 B CN108220562 B CN 108220562B CN 201810015037 A CN201810015037 A CN 201810015037A CN 108220562 B CN108220562 B CN 108220562B
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- ingot casting
- mould steel
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- carbide
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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
- C21D6/00—Heat treatment of ferrous alloys
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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
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention relates to a kind of mould steel phase transformation heat treatment methods, can improve mould steel structural homogenity, improve liver mass and performance.It is of the invention to be mainly characterized by being heated slowly to 700~850 DEG C to mould steel ingot casting first, 2~6h is kept the temperature, then be rapidly heated to 1000~1100 DEG C of heat preservation 15min~3h, then in 1100~1200 DEG C of 2~10h of heat preservation.The mould steel produced using this method can shorten heat treatment time, while mould steel carbide size is tiny, and liver mass is high.
Description
Technical field
The present invention relates to a kind of mould steel phase transformation heat treatment methods, and in particular to a kind of refined carbides size improves
The method of mould steel liver mass.
Background technique
Mould steel (high-speed steel and mould steel) is because having many advantages, such as high rigidity, high-wearing feature, mainly for the manufacture of complexity
Cutting element, precision die etc. are the important foundation materials of high-end equipment manufacture.As tool and mould is enlarged and precise treatment,
Increasingly strict requirement is proposed to tool die material quality.It is designed by the ingredient of high-carbon high-alloy, is formed in mould steel
A large amount of hard, stable alloy carbide, ensure that the performance requirement of mould steel.And carbide in it is tiny it is spherical, distribution is equal
It is even, there is good structural homogenity, then be the premise for giving full play to carbide reinforced effect.
Existing mould steel production technology mainly uses pressure processing technology (cogging, forging, rolling), utilizes high temperature deformation
The strong flow stress generated in the process carries out Mechanical Crushing and separation to the carbide in ingot casting, to make carbide size
Refinement, distribution improve.This method is by many factors such as ingot casting ingot shape size, ratio of forging reduction, mode of texturing, equipment pressure load
Limitation, usually only in the case where ratio of forging reduction is very big, pressure processing is just obvious to the improvement of distribution of carbides.
Carbide spheroidization processing is to refine another important technical of mould steel carbide size.By by tool and mould
Steel ingot casting is slowly heated to carbide decomposition temperature (usual 900 DEG C or so) above isothermal holding, make carbide decompose and
Nodularization, refined carbides size.For avoid ingot casting in temperature-rise period because heat conduction problem, internal stress is excessive due to crack, carbide
Spheroidising is usually slowly heated heating, to guarantee that inside ingot temperature is uniform.The technique can make carbide to a certain extent
Size is refined, but the refinement since the limited caused nodularization driving force in Carbide Phases interface is insufficient, to carbide size
Effect is still unable to satisfy the quality requirement of high-quality mould steel.
In addition to this, the means such as Metamorphism treatment, inoculation also be used to improve mould steel structural homogenity, but effect
It is limited.In high-quality mould steel actual production, the mould steel ingot casting of especially big specification, how refined carbides ruler
Very little, raising structural homogenity, is the failure to always the important technological problems effectively solved.
Summary of the invention
Technical problem: the object of the present invention is to provide a kind of mould steel phase transformation heat treatment methods, can refine work mould
Have the method for steel carbide size, solves the problems, such as that the mould steel liver mass of Conventional processing methods production is insufficient.
Technical solution: different using extremely slow heating rate from traditional carbide spheroidising, the present invention is using a kind of fast
Fast phase transformation heat treatment method.The specific process steps are as follows:
(1) slowly preheating: the heating rate to be not higher than 2 DEG C/min, mould steel ingot casting is heated slowly to 700~
850 DEG C, keep the temperature 2~6h；
(2) rapid phase transition is heat-treated: being quickly heated up to the heating rate higher than 15 DEG C/min to mould steel ingot casting
1000~1100 DEG C, keep the temperature 15min~3h；
(3) carbide spheroidization anneal: to mould steel ingot casting carry out carbide spheroidization annealing, annealing temperature 1100~
1200 DEG C, keep the temperature 2~10h；
(4) slow cooling: mould steel ingot casting slowly cools to 200 DEG C or so, comes out of the stove.
The utility model has the advantages that the conventional machinings such as being forged, being rolled to the mould steel ingot casting after spheroidising, finally produced
Product.
The present invention keeps ingot casting internal and external temperature uniform, avoids drawing because of heat conduction problem by being slowly preheated to 850 DEG C of following temperature
Play that built-in thermal stress is excessive and the problem of crack.Using being rapidly heated, carbide THERMODYNAMICAL STUDY and dynamics are influenced, greatly
Promote carbide phase transformation reaction, is ready for subsequent spheroidising.On the basis of rapid phase transition heat treatment, moved back using nodularization
Fire process promotes carbide spheroidization process, significant refined carbides size.With existing mould steel heat treatment process and product
It compares, above-mentioned process program not only shortens nodularization heat treatment time, improves production efficiency, but also makes carbide size into one
Step refinement, promotes structural homogenity, meets the quality requirement of the high-end tool and mould product such as large complicated cutter, precision die.
Specific embodiment
Improvement of the invention is mainly reflected in: the technique for changing traditional mould steel spheroidising slow heating heating is thought
Road promotes carbide phase transformation reaction using the method for being rapidly heated, and increases phase interface and nodularization driving force, is easier carbide
Nodularization and refinement, to achieve the purpose that improve mould steel liver mass.
Process of the invention is described in detail below in conjunction with specific embodiment.
Embodiment 1:
The M2 high-speed steel ingot casting obtained by melting, casting, electroslag remelting is handled as follows:
(1) slowly preheating: with the heating rate of 0.5 DEG C/min, M2 high-speed steel ingot casting is heated slowly to 800 DEG C, heat preservation
4h；
(2) rapid phase transition is heat-treated: M2 high-speed steel ingot casting is rapidly heated to 1100 DEG C with the heating rate of 20 DEG C/min,
Keep the temperature 30min；
(3) spheroidizing: 4h is kept the temperature to M2 high-speed steel ingot casting at 1150 DEG C, makes the abundant nodularization of carbide；
(4) slow cooling: M2 high-speed steel ingot casting slowly cools to 200 DEG C or so, comes out of the stove.
It the pressure processings such as forged, rolled to M2 high-speed steel ingot casting, obtain M2 high speed steel product.
Embodiment 2:
The M42 high-speed steel ingot casting obtained by melting, casting, electroslag remelting is handled as follows:
(1) slowly preheating: with the heating rate of 0.3 DEG C/min, M42 high-speed steel ingot casting is heated slowly to 850 DEG C, heat preservation
3h；
(2) rapid phase transition is heat-treated: quickly heating up to 1050 to M42 high-speed steel ingot casting with the heating rate of 15 DEG C/min
DEG C, keep the temperature 2h；
(3) spheroidizing: 2h is kept the temperature to M42 high-speed steel ingot casting at 1180 DEG C, makes the abundant nodularization of carbide；
(4) slow cooling: M42 high-speed steel ingot casting slowly cools to 200 DEG C or so, comes out of the stove.
It the pressure processings such as forged, rolled to M42 high-speed steel ingot casting, obtain M42 high speed steel product.
Embodiment 3:
The D2 mould steel ingot casting obtained by melting, casting, electroslag remelting is handled as follows:
(1) slowly preheating: with the heating rate of 1 DEG C/min, D2 mould steel ingot casting is heated slowly to 720 DEG C, keeps the temperature 6h；
(2) rapid phase transition is heat-treated: 1050 DEG C are quickly heated up to D2 mould steel ingot casting with the heating rate of 25 DEG C/min,
Keep the temperature 3h；
(3) spheroidizing: 5h is kept the temperature to D2 mould steel ingot casting at 1100 DEG C, makes the abundant nodularization of carbide；
(4) slow cooling: D2 mould steel ingot casting slowly cools to 200 DEG C or so, comes out of the stove.
It the pressure processings such as forged, rolled to D2 mould steel ingot casting, obtain D2 Die Steel Products.
Embodiment 4:
The D3 mould steel ingot casting obtained by melting, casting, electroslag remelting is handled as follows:
(1) slowly preheating: with the heating rate of 0.5 DEG C/min, D3 mould steel ingot casting is heated slowly to 800 DEG C, heat preservation
5h；
(2) rapid phase transition is heat-treated: 1000 DEG C are quickly heated up to D3 mould steel ingot casting with the heating rate of 15 DEG C/min,
Keep the temperature 3h；
(3) spheroidizing: 4h is kept the temperature to D3 mould steel ingot casting at 1120 DEG C, makes the abundant nodularization of carbide；
(4) slow cooling: D3 mould steel ingot casting slowly cools to 200 DEG C or so, comes out of the stove.
It the pressure processings such as forged, rolled to D3 mould steel ingot casting, obtain D3 Die Steel Products.
Embodiment 5:
The W9 high-speed steel ingot casting obtained by melting, casting, electroslag remelting is handled as follows:
(1) slowly preheating: with the heating rate of 0.5 DEG C/min, W9 high-speed steel ingot casting is heated slowly to 820 DEG C, heat preservation
4h；
(2) rapid phase transition is heat-treated: 1100 DEG C are quickly heated up to W9 high-speed steel ingot casting with the heating rate of 20 DEG C/min,
Keep the temperature 1.5h；
(3) spheroidizing: 4h is kept the temperature to W9 high-speed steel ingot casting at 1150 DEG C, makes the abundant nodularization of carbide；
(4) slow cooling: W9 high-speed steel ingot casting slowly cools to 200 DEG C or so, comes out of the stove.
It the pressure processings such as forged, rolled to W9 high-speed steel ingot casting, obtain W9 high speed steel product.
Embodiment 6:
The M2 high-speed steel ingot casting obtained by melting, casting, electroslag remelting is handled as follows:
(1) slowly preheating: with the heating rate of 2 DEG C/min, M2 high-speed steel ingot casting is heated slowly to 850 DEG C, keeps the temperature 2h；
(2) rapid phase transition is heat-treated: M2 high-speed steel ingot casting is rapidly heated to 1050 DEG C with the heating rate of 15 DEG C/min,
Keep the temperature 2h；
(3) spheroidizing: 5h is kept the temperature to M2 high-speed steel ingot casting at 1120 DEG C, makes the abundant nodularization of carbide；
(4) slow cooling: M2 high-speed steel ingot casting slowly cools to 200 DEG C or so, comes out of the stove.
It the pressure processings such as forged, rolled to M2 high-speed steel ingot casting, obtain M2 high speed steel product.
Claims (2)
1. a kind of mould steel phase transformation heat treatment method, it is characterised in that the heat treatment method includes the following steps:
1) slowly preheating: mould steel ingot casting is slowly preheated；
2) rapid phase transition is heat-treated: quickly being heated to ingot casting, is kept the temperature after reaching predetermined temperature；
3) carbide spheroidization is annealed: being made annealing treatment to ingot casting, is made carbide spheroidization；
4) slow cooling: so that ingot casting is slowly cooled to 200 DEG C, come out of the stove；
Wherein:
The control of ingot casting preheating temperature is at 700~850 DEG C in step 1), 2~6h of preheating time；
The slow preheating, heating rate are lower than 2 DEG C/min；
Wherein:
The heating rate that rapid phase transition is heat-treated in step 2 is higher than 15 DEG C/min；
For the control of rapid phase transition heat treatment temperature at 1000 ~ 1100 DEG C, soaking time is 15min~3h in step 2.
2. mould steel phase transformation heat treatment method according to claim 1, which is characterized in that the carbide ball in step 3)
Annealing, 1100~1200 DEG C of spheroidizing temperature, 2~10h of soaking time.
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| CN201810015037.XA CN108220562B (en) | 2018-01-08 | 2018-01-08 | A kind of mould steel phase transformation heat treatment method |
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| CN108220562B true CN108220562B (en) | 2019-07-19 |
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| JP2008121032A (en) * | 2006-11-08 | 2008-05-29 | Daido Steel Co Ltd | Die steel superior in spheroidizing annealing property and hardenability |
| CN100469938C (en) * | 2007-03-05 | 2009-03-18 | 大连海事大学 | Series superfine carbide high alloy tool steel |
| CN105886729A (en) * | 2014-12-19 | 2016-08-24 | 罗武学 | Heat treatment method for die |
| CN105063310A (en) * | 2015-08-17 | 2015-11-18 | 中原特钢股份有限公司 | Structure ultra-fine treatment process for high-chromium corrosion-resistant plastic mould steel |
| CN106011420B (en) * | 2016-07-20 | 2017-12-19 | 东南大学 | A kind of preparation method of high uniformity mould steel |
| CN107058717B (en) * | 2017-01-18 | 2018-10-23 | 抚顺特殊钢股份有限公司 | Improve the heat treatment process of big specification Flat Die Steel forging material spherodized structure |
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Address after: 210096 No. four archway, 2, Jiangsu, Nanjing Patentee after: SOUTHEAST University Patentee after: Jiangsu Tiangong tools and new materials Co., Ltd Address before: 210096 No. four archway, 2, Jiangsu, Nanjing Patentee before: SOUTHEAST University Patentee before: Jiangsu Tiangong Tools Co., Ltd |