CN85102387A - The die steel of high carbon, high chromium series compound toughening treatment process - Google Patents
The die steel of high carbon, high chromium series compound toughening treatment process Download PDFInfo
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- CN85102387A CN85102387A CN 85102387 CN85102387A CN85102387A CN 85102387 A CN85102387 A CN 85102387A CN 85102387 CN85102387 CN 85102387 CN 85102387 A CN85102387 A CN 85102387A CN 85102387 A CN85102387 A CN 85102387A
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Abstract
The invention belongs to the ferrous materials heat-treatment technology method, the composite toughening treatment process of die steel of high carbon, high chromium series is provided.Adopt high temperature deformation thermal treatment and high-temperature heating tempering thermal treatment process in advance, adopt low-temperature heat quenching and low-temperature heat tempering final thermal treatment process as workpiece as workpiece blank.After die steel of high carbon, high chromium series adopts art breading of the present invention, make the uneven distribution rank of carbide in the steel descend 3～4 grades the obvious refinement of proeutectoid carbide.Make the concealed crystal tissue of steel acquisition, thereby the intensity of steel and toughness are significantly improved simultaneously based on dislocatrion martensite.
Description
The invention belongs to the ferrous materials heat-treatment technology method.
Die steel of high carbon, high chromium series is celebrated with its high-hardenability, high strength, high-wearing feature, is widely used in making big, middle section size, the cold-work die of heavy lift.But this steel contains a considerable amount of once eutectic carbides.This carbide generally is banded uneven distribution after hot rolling, it is netted to be accumulation when serious.Even through forging once more, its uneven distribution tendency but still exists, and therefore makes the plasticity and toughness of steel lower, usually causes tool and mould tipping in use, cracking and early fatigue damage directly hinder the giving full play to of high strength, high-wearing feature of steel.In order to improve the plasticity and toughness of these type of steel, the someone has proposed new method for toughening.Print as in 1980 the 7th phases of magazine " metal heat treatmet ": " processing of Cr12 steel circulating phase-change highly malleablized " (hereinafter to be referred as " circular treatment ") and " thermal treatment is to the influence of Cr12MoV structure of steel and obdurability " (hereinafter to be referred as " tissue and obdurability ")." circular treatment " though a literary composition is worked from refinement carbide aspect, and technology is complicated, the uniform problem of carbide does not relate to simultaneously." tissue and obdurability " civilian basic point is the matrix that improves steel, involved steel, and its distribution of carbides is even substantially, to the particularly not consideration of influence of primary carbide ununiformity of influence of carbide.Therefore, cause the uneven distribution of this quality factor-carbide of this type of steel inductile performance not eliminate.
In order to eliminate the low plasticity and toughness hidden danger of steel, there is the people that the uniform and refinement of the carbide of this type of steel is studied." the hot Combined Processing of forging of refinement Cr12MoV steel carbide " (hereinafter to be referred as " Combined Processing ") that " with the carbide in the remnant forging thermal quenching refinement tool steel " (hereinafter to be referred as " immediate quenching ") of printing as in 1980 fifth phase of magazine " metal heat treatmet " and in 1981 the 7th phases print." immediate quenching " one literary composition proposes " reduce final forging temperature to 700 ℃ ", and obviously this is difficult to carry out aborning." Combined Processing " one literary composition proposes to increase a high temperature solid solution and handles in the middle of twice forging, only can bring into play effectiveness under the whole or big portion of the carbide dissolved condition making in the steel by this link of known theory.So the improvement for the carbide ununiformity still is limited.In fact two literary compositions do not relate to the improvement of the middle-and-high-ranking other carbide ununiformity of steel (5～8 grades) yet.
The present invention is directed to the problems referred to above and done improvement.Introduce the high temperature deformation heat treatment technics high carbon, high chromium series steel has been implemented a kind of multipath composite toughening processing method, made the intensity of high carbon, high chromium series steel and toughness obtain simultaneously to increase substantially.
Main points of the present invention are, (Heating temperature can be 740 ℃～760 ℃ with high temperature deformation thermal treatment and high tempering, the heat tracing time can be 2～3 hours) as the thermal treatment process in advance of workpiece blank, with low-temperature heat quench (Heating temperature can be 940 ℃～950 ℃) and low-temperature heat tempering (Heating temperature can be 200 ℃～250 ℃) as the final thermal treatment process of workpiece.
The heat treated deformation mode of high temperature deformation can be to forge (upsetting and stretching), also can be rolling.Thermomechanical treatment processing method and processing parameter can be determined according to the ununiformity degree of carbide in the starting material:
When the carbide ununiformity is 1～3 grade in the starting material, can adopt a deformation immediate quenching to handle.Heating temperature can be 1120 ℃～1150 ℃, and the beginning deformation temperature can be 1000 ℃, stops deformation temperature and can be 850 ℃～870 ℃, stops quenching immediately after the deformation.
When the carbide ununiformity is 4～6 grades in the starting material, can adopt twice cyclic deformation immediate quenching to handle.The immediate quenching of deformation for the first time, Heating temperature can be 1100 ℃～1130 ℃, and the beginning deformation temperature can be 1050 ℃～1100 ℃, stops deformation temperature and can be 850 ℃～870 ℃, stops quenching immediately after the deformation; The immediate quenching of deformation for the second time, Heating temperature can be 1050 ℃～1100 ℃, and the beginning deformation temperature can be 1000 ℃, stops deformation temperature and can be 850 ℃～870 ℃, stops quenching immediately after the deformation.
When the carbide rank is 7～8 grades in the starting material, can adopt the solution treatment of twice cyclic deformation immediate quenching plus high temperature diffusion.The High temperature diffusion solution treatment can be added in the middle of twice deformation immediate quenching, and the solution treatment Heating temperature can be 1150 ℃～1170 ℃, and soaking time can be 0.5～1 hour, quenches immediately after coming out of the stove.Twice cyclic deformation immediate quenching processing method and processing parameter be, its Heating temperature can be 1100 ℃～1130 ℃ for the first time, and the beginning deformation temperature can be 1050 ℃～1100 ℃, stops deformation temperature and can be 850 ℃～870 ℃, stops quenching immediately after the deformation; Its Heating temperature can be 1050 ℃～1100 ℃ for the second time, and the beginning deformation temperature can be 1000 ℃, stops deformation temperature and can be 850～870 ℃, stops quenching immediately after the deformation.
Deformation immediate quenching and High temperature diffusion solution treatment involved among the present invention are quenched, the equal usable oils of its quenching medium, and the fuel-displaced temperature of workpiece blank can be 240 ℃～250 ℃, the fuel-displaced stackable slow cooling in back.
Die steel of high carbon, high chromium series adopts thermal treatment process of the present invention after treatment, and the uneven distribution rank of carbide in the steel is descended 3～4 grades, the obvious refinement of proeutectoid carbide, and the mean diameter of carbide particle is 0.2～0.5 μ m.Make the concealed crystal tissue of steel acquisition based on dislocatrion martensite.Compare with common process (forging → spheroidizing → one time hardening process quench tempering), make the bending strength of steel improve 50%～60%, notched bar impact strength improves 80%～90%, and the fracture toughness property value improves 30%～40%, and crack initiation drag index improves 4～5 times.
Claims (3)
1, die steel of high carbon, high chromium series toughening treatment process, the invention is characterized in employing high temperature deformation thermal treatment and high-temperature heating tempering thermal treatment process in advance, and employing low-temperature heat quenching and low-temperature heat tempering are as the final thermal treatment process of workpiece as workpiece blank.
2,, it is characterized in that high temperature deformation process of thermal treatment method and processing parameter will determine according to the ununiformity of the carbide in the workpiece starting material by the described die steel of high carbon, high chromium series toughening treatment process of claim 1:
When the ununiformity of carbide in the starting material is 1～3 grade, adopt one time the deformation immediate quenching, its Heating temperature is 1120 ℃～1150 ℃, and the beginning deformation temperature is 1000 ℃, and stopping deformation temperature is 850 ℃～870 ℃, stops quenching immediately after the deformation;
When the ununiformity of carbide in the starting material is 4～6 grades, adopt the cyclic deformation immediate quenching twice.For the first time, its Heating temperature is 1100 ℃～1130 ℃, and the beginning deformation temperature is 1050 ℃～1100 ℃, and stopping deformation temperature is 850 ℃～870 ℃, stops quenching immediately after the deformation; For the second time, its Heating temperature is 1050 ℃～1100 ℃, and the beginning deformation temperature is 1000 ℃, and stopping deformation temperature is 850 ℃～870 ℃, stops quenching immediately after the deformation;
When the ununiformity of carbide in the starting material is 7～8 grades, adopt the solution treatment of twice cyclic deformation immediate quenching plus high temperature diffusion.The High temperature diffusion solution treatment is added between twice deformation immediate quenching, and its Heating temperature is 1150 ℃～1170 ℃, and be 0.5～1 hour heat-up time, cools off fuel-displaced air cooling when being chilled to 240 ℃～250 ℃ in the oil of quenching immediately after workpiece blank is come out of the stove.The processing parameter of twice cyclic deformation immediate quenching is: for the first time, its Heating temperature is 1100 ℃～1130 ℃, and the beginning deformation temperature is 1050 ℃～1100 ℃, and stopping deformation temperature is 850 ℃～870 ℃, stops quenching immediately after the deformation; For the second time, its Heating temperature is 1050 ℃～1100 ℃, and the beginning deformation temperature is 1000 ℃, and stopping deformation temperature is 850 ℃～870 ℃, stops quenching immediately after the deformation.Quench immediately after the said termination deformation, be meant that workpiece blank stops deformation after, cool off fuel-displaced air cooling when being chilled to 240 ℃～250 ℃ in the oil of quenching at once.
3, by claim 1 or 2 described die steel of high carbon, high chromium series toughening treatment process, it is characterized in that said high-temperature heating tempering, its Heating temperature is 740 ℃～760 ℃, and be 2～3 hours heat-up time; Said low-temperature heat is quenched, and its Heating temperature is 940 ℃～950 ℃; Said low-temperature heat tempering, its Heating temperature are 200 ℃～250 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85102387 CN85102387A (en) | 1985-04-01 | 1985-04-01 | The die steel of high carbon, high chromium series compound toughening treatment process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85102387 CN85102387A (en) | 1985-04-01 | 1985-04-01 | The die steel of high carbon, high chromium series compound toughening treatment process |
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| Publication Number | Publication Date |
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| CN85102387A true CN85102387A (en) | 1986-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 85102387 Pending CN85102387A (en) | 1985-04-01 | 1985-04-01 | The die steel of high carbon, high chromium series compound toughening treatment process |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101121954B (en) * | 2006-08-08 | 2010-10-06 | 上海市机械制造工艺研究所有限公司 | H13 steel vacuum time-control quenching heat treatment technique |
| CN101623737B (en) * | 2009-08-07 | 2011-02-02 | 重庆新源模具有限公司 | Stretch forming die obtained by surface processing |
| CN101985723A (en) * | 2010-12-07 | 2011-03-16 | 吉林大学 | Strengthening preparation method for hot die steel |
| CN102676778A (en) * | 2012-06-15 | 2012-09-19 | 株洲春华实业有限责任公司 | Strengthening and toughening thermal treatment method for hot-forging die of wearing plate |
| CN1514887B (en) * | 2001-02-09 | 2013-05-15 | 奎斯泰克创新公司 | Nanocarbide precipitation strengthened ultrahigh-strength corrosion-resistant, structural steels |
| CN105779896A (en) * | 2016-04-28 | 2016-07-20 | 太仓市沪太热处理厂 | Heating processing technology for high-carbon high-alloy cold work die steel |
| CN106319178A (en) * | 2016-08-25 | 2017-01-11 | 瑞安市劲力机械制造有限公司 | Forging and thermal treatment technique for Cr12MoV steel |
-
1985
- 1985-04-01 CN CN 85102387 patent/CN85102387A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1514887B (en) * | 2001-02-09 | 2013-05-15 | 奎斯泰克创新公司 | Nanocarbide precipitation strengthened ultrahigh-strength corrosion-resistant, structural steels |
| CN101121954B (en) * | 2006-08-08 | 2010-10-06 | 上海市机械制造工艺研究所有限公司 | H13 steel vacuum time-control quenching heat treatment technique |
| CN101623737B (en) * | 2009-08-07 | 2011-02-02 | 重庆新源模具有限公司 | Stretch forming die obtained by surface processing |
| CN101985723A (en) * | 2010-12-07 | 2011-03-16 | 吉林大学 | Strengthening preparation method for hot die steel |
| CN102676778A (en) * | 2012-06-15 | 2012-09-19 | 株洲春华实业有限责任公司 | Strengthening and toughening thermal treatment method for hot-forging die of wearing plate |
| CN105779896A (en) * | 2016-04-28 | 2016-07-20 | 太仓市沪太热处理厂 | Heating processing technology for high-carbon high-alloy cold work die steel |
| CN106319178A (en) * | 2016-08-25 | 2017-01-11 | 瑞安市劲力机械制造有限公司 | Forging and thermal treatment technique for Cr12MoV steel |
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