CN102994737A - Method for adjusting strength distribution of parts during forming of high-strength steel material - Google Patents
Method for adjusting strength distribution of parts during forming of high-strength steel material Download PDFInfo
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- CN102994737A CN102994737A CN2012105934066A CN201210593406A CN102994737A CN 102994737 A CN102994737 A CN 102994737A CN 2012105934066 A CN2012105934066 A CN 2012105934066A CN 201210593406 A CN201210593406 A CN 201210593406A CN 102994737 A CN102994737 A CN 102994737A
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Abstract
The invention discloses a method for adjusting strength distribution of parts during forming of a high-strength steel material, relates to a forming method of the high-strength steel material, and aims to solve the problem of difficult part strength distribution control during forming of parts of dual-phase steel, transformation induced plasticity steel, Martensitic steel, complex phase steel or twin transformation induced plasticity steel. The method includes using a heating device to locally heat an area with a low final strength requirement on a high-strength steel blank to 200DEG C-1000DEG C; preserving heat of the high-strength steel blank for 0-30min to enable local tissue of the high-strength steel blank to change; closing the heating device and cooling the high-strength steel blank to the room temperature; and placing the high-strength steel blank after local heating processing to a die for forming and obtaining a high-strength steel part with required strength change distribution. The method is applicable to high-strength steel forming.
Description
Technical field
The present invention relates to a kind of manufacturing process of high-strength steel material, be specifically related to regulate when the high-strength steel material is shaped the method that part strength distributes.
Background technology
In industries such as aerospace field and automobile makings, the lightweight of structure has become one of most important target.The light-weighted main path of implementation structure, the one, carry out the structural optimization design, utilize member complicated, that whole member replaces in the past split shaping, assembly welding; The 2nd, adopt the high light materials of specific tenacity such as aluminium alloy, magnesium alloy, utilize the material of equal in quality that higher intensity is provided.
In automobile industry, along with the requirement to loss of weight is day by day urgent, a collection of high-intensity steel are developed, such as two-phase (DP) steel, phase-change induced plastic (TRIP) steel, martensite (M) steel, complex phase (CP) steel, thermoforming (HF) steel, twin crystal inducing plasticity (TWIP) steel and thermoforming (HF) steel, because going out the tensile strength of part, these material formed therebies are higher than common steel far away, materials can reach 1500MPa even higher, so also can be described as light material.
In actual application, requiring the high-intensity while of part, require its integral body or part to have enough plasticity or toughness toward contact, to satisfy the requirement of the aspects such as collision, connection.In the past, can be by the method for laser assembly solder, the blank of different sorts, different thickness is welded together then distortion, to obtain the part of reasonable intensity distribution.But because the welding of foreign material difficulty relatively, undergo mutation at the thickness of weld material etc. in addition, often cause the shaping difficulty of part or be shaped after the intensity distribution of part do not reach requirement.
China Patent No. is 201110126218.8, open day be that on 05 16th, 2011 patent of invention discloses flexible hot press-formed auto parts and the control method thereof that distributes of a kind of intensity, the forming process of this patent is by the Cooling Quenching speed of different sites on the control part, realizes control and the adjustment of intensity distribution.But for non-hot formed high-strength steel, such as two-phase (DP) steel, phase-change induced plastic (TRIP) steel, martensite (M) steel, complex phase (CP) steel and twin crystal inducing plasticity (TWIP) steel, still there is not a kind of method of high-strength steel part of the Strength Changes distribution that can simple and effectively be shaped at present.
Summary of the invention
The objective of the invention is when solving at present for shaping dual phase steel, transformation induced plasticity steel, martensitic steel, Multiphase Steel or twin crystal inducing plasticity steel part, control part strength distribution hard problem, and the method that part strength distributes is provided when providing a kind of high-strength steel material to be shaped.
Method of the present invention realizes by following steps:
Step 1, utilize heating unit to the low regional local heating to 200 of requirement of strength on the high-strength steel blank 1 ℃～1000 ℃;
Step 2, to high-strength steel blank 1 insulation 0～30min, the local organization of high-strength steel blank 1 is changed;
Step 3, close well heater 2, make high-strength steel blank 1 cool to room temperature;
Step 4, place mould to form the high-strength steel blank 1 after the local heat treatment, obtain the high-strength steel part that required Strength Changes distributes.
The present invention compared with prior art has following effect:
One, the high-strength steel part that distributes for the intensity adjustable that is shaped, for requiring the weak zone of part strength after being shaped, before shaping, carry out local heat treatment, this regional martensite, bainite or residual austenite body tissue are changed, reduce martensite and bainite content and can reduce its initial strength and preliminary work hardening rate; Reduce the martensite that undergoes phase transition generation when residual austenite content can reduce distortion, the present invention is just from changing the tissue before the high-strength steel blank is shaped, only need by the high-strength steel blank is carried out local heat treatment, control Heating temperature and heat-up time, can obtain different tissues and intensity, avoided the performance sudden change of traditional butt welding method, simplified die design and technological process, the intensity distribution of high-strength steel part is better.Two, first blank is carried out local heat treatment before the shaping, heating causes the part shape dimensional change with cooling when having avoided heat-treating behind part forming again, has guaranteed the part shape dimensional precision.Three, soften by the blank different sites being carried out local heat treatment, can improve the local plasticity and toughness of material, the deformation sequence of control material different sites is suitable for the more complicated part of shaping form.Four, material range of application of the present invention is wider, can be applicable to the advanced high-strength steel such as two-phase (DP) steel, phase-change induced plastic (TRIP) steel, martensite (M) steel, complex phase (CP) steel and twin crystal inducing plasticity (TWIP) steel.
Description of drawings
Fig. 1 is the heat-processed synoptic diagram of step 1 in the embodiment one; Fig. 2 is that step 3 is set up local cooling device 3 to the demanding zone of part strength in the embodiment one, makes this regional temperature be lower than all the time 200 ℃ implementation process synoptic diagram; Fig. 3 is the implementation process synoptic diagram of embodiment six; Fig. 4 is the implementation process synoptic diagram of embodiment seven; Fig. 5 is the implementation process synoptic diagram of embodiment eight.
Embodiment
Embodiment one: the performing step that specifies present embodiment in conjunction with Fig. 1～Fig. 5:
Step 1, utilize heating unit to the low regional local heating to 200 of final strength requirement on the high-strength steel blank 1 ℃～1000 ℃; Final strength requires the high-strength steel part strength after low zone refers to be shaped to require low zone.The division in the zone that the zone that requirement of strength is high and requirement of strength are low is to divide according to the needs of part;
Step 2, to high-strength steel blank 1 insulation 0～30min, the local organization of high-strength steel blank 1 is changed;
Step 3, close well heater 2, make high-strength steel blank 1 cool to room temperature;
Step 4, place mould to form the high-strength steel blank 1 after the local heat treatment, obtain the high-strength steel part that required Strength Changes distributes.
Adopt this embodiment, the zone that the part desired strength is high is not heated, keep its original structure state, this field strength is still higher behind the part forming; Local heat treatment is carried out in the zone that the part desired strength is weak, this regional organization is changed and strength decreased or preliminary work hardening rate are reduced, cause behind the part forming should the zone intensity a little less than.
Embodiment two: in conjunction with Fig. 1 present embodiment is described, high-strength steel blank 1 is two-phase (DP) steel, phase-change induced plastic (TRIP) steel, martensite (M) steel, complex phase (CP) steel or twin crystal inducing plasticity (TWIP) steel in the step 1 of present embodiment.
For two-phase (DP) steel, phase-change induced plastic (TRIP) steel, martensite (M) steel, complex phase (CP) steel and twin crystal inducing plasticity (TWIP) steel, it is organized and all contains martensite or residual austenite, so initial strength is very high or undergo phase transition by residual austenite in when distortion and to form martensite or the material violent work hardening of generation and to obtain higher intensity.
The microstructure of two-phase (DP) steel mainly is the distributing hard martensitic phase of island of the ferrite at soft matrix, the higher then initial strength of martensite content is higher, and because the existence of hard martensitic phase makes dual phase steel that very high preliminary work hardening rate be arranged.Therefore before shaping, pass through the local heat treatment to blank, reduce the content of its martensitic phase, can reduce its intensity, and reduce preliminary work hardening rate, the intensity distribution that therefore can regulate by partial heat treatment the high-strength steel part.
There is polyphase structure in phase-change induced plastic (TWIP) steel, is generally ferrite, bainite, residual austenite and martensite.In deformation process, residual austenite has caused phase transformation strengthening during to martensitic transformation, therefore by the local heat treatment to blank, not only can reduce the bainite and martensite in its initial structure, to reduce its initial strength, can also reduce the content of its residual austenite, thereby undergo phase transition the martensite of generation when reducing distortion, thus the intensity distribution of regulating the high-strength steel part.
For martensite (M) steel, complex phase (CP) steel and twin crystal inducing plasticity (TWIP) steel, the mechanism of regulating its intensity distribution also is similar.
Adopt present embodiment, for two-phase (DP) steel, phase-change induced plastic (TRIP) steel, martensite (M) steel, complex phase (CP) steel, make martensite, bainite or residual austenite etc. in the tissue change ferrite or perlite into by local heat treatment, its initial strength is reduced.For twin crystal inducing plasticity (TWIP) steel, room temperature undertissue is stable austenite, by anneal its tissue is changed before being shaped, annealing temperature is higher, and soaking time is longer, and austenite crystal is larger after the annealing, annealing twin quantity is more, this moment strength decreased, and plasticity improves.It needs to be noted that the Heating temperature of differing materials is different with soaking time, need by concrete measuring.Other step is identical with embodiment one with parameter.
Embodiment three: present embodiment is described in conjunction with Fig. 2, in the step 1 of present embodiment in the demanding zone of part strength (namely do not need heat zone), local cooling device 3 is set, in the process of heating, to this area spray water coolant or liquid nitrogen, make this regional temperature be lower than all the time 200 ℃ by local cooling device 3.Adopt this embodiment, can prevent because heat conduction do not need to conduct to the heat of heating region the zone of heating, the regional temperature that does not need to heat is remained be lower than 200 ℃, organize not change, more be conducive to control the intensity distribution of part.In addition, adopt liquid nitrogen also can play the effect of protective atmosphere as heat-eliminating medium, prevent the blank surface oxidation.Other step is identical with embodiment one or two with parameter.
Embodiment four: in conjunction with Fig. 1～Fig. 5 present embodiment is described, the heating unit in the step 1 of present embodiment is well heater 2 or ruhmkorff coil.It is temperature required that above-mentioned type of heating is heated to rapidly high-strength steel blank 1, and heat-up time is short, and efficient is high.Other step is identical with embodiment one with parameter.
Embodiment five: in conjunction with Fig. 3～Fig. 5 present embodiment is described, the ruhmkorff coil of present embodiment is spiral ruhmkorff coil 4, snail formula ruhmkorff coil 5 or plane side-by-side ruhmkorff coil 6.Other step is identical with embodiment four with parameter.
Embodiment six: in conjunction with Fig. 3 present embodiment is described, the high-strength steel blank 1 in the step 1 of present embodiment is tubing, and the local heating mode adopts spiral ruhmkorff coil 4.Other step is identical with embodiment one with parameter.
Embodiment seven: in conjunction with Fig. 4 present embodiment is described, the high-strength steel blank 1 in the step 1 of present embodiment is sheet material, and the local heating mode adopts snail formula ruhmkorff coil 5.Other step is identical with embodiment one with parameter.
Embodiment eight: in conjunction with Fig. 5 present embodiment is described, the high-strength steel blank 1 in the step 1 of present embodiment is sheet material, and the local heating mode adopts plane side-by-side ruhmkorff coil 6.Other step is identical with embodiment one with parameter.
Embodiment nine: in conjunction with Fig. 1～Fig. 5 present embodiment is described, the local heating temperature is 500 ℃ in the step 1 of present embodiment.Other step is identical with embodiment one with parameter.
Embodiment ten: in conjunction with Fig. 1～Fig. 5 present embodiment is described, in the step 2 of present embodiment high-strength steel blank 1 is incubated 15min.Other step is identical with embodiment one with parameter.
Claims (10)
1. regulate the method that part strength distributes when a high-strength steel material is shaped, it is characterized in that: described method realizes by following steps:
Step 1, utilize heating unit to the low regional local heating to 200 of requirement of strength on the high-strength steel blank 1 ℃～1000 ℃;
Step 2, to high-strength steel blank 1 insulation 0～30min, the local organization of high-strength steel blank 1 is changed;
Step 3, close well heater 2, make high-strength steel blank 1 cool to room temperature;
Step 4, place mould to form the high-strength steel blank 1 after the local heat treatment, obtain the high-strength steel part that required Strength Changes distributes.
2. regulate the method that part strength distributes when described a kind of high-strength steel material is shaped according to claim 1, it is characterized in that: high-strength steel blank (1) is dual phase steel, transformation induced plasticity steel, martensitic steel, Multiphase Steel or twin crystal inducing plasticity steel in the described step 1.
3. regulate the method that part strength distributes when described a kind of high-strength steel material is shaped according to claim 1 and 2, it is characterized in that: in the described step 1 in the demanding zone of part strength, local cooling device (3) is set, in the process of heating, to this area spray water coolant or liquid nitrogen, make this regional temperature be lower than all the time 200 ℃ by local cooling device (3).
4. regulate the method that part strength distributes when described a kind of high-strength steel material is shaped according to claim 1, it is characterized in that: the heating unit in the described step 1 is well heater (2) or ruhmkorff coil.
5. regulate the method that part strength distributes when described a kind of high-strength steel material is shaped according to claim 4, it is characterized in that: described ruhmkorff coil is spiral ruhmkorff coil (4), snail formula ruhmkorff coil (5) or plane side-by-side ruhmkorff coil (6).
6. regulate the method that part strength distributes when described a kind of high-strength steel material is shaped according to claim 1, it is characterized in that: the high-strength steel blank (1) in the described step 1 is tubing, and the local heating mode adopts spiral ruhmkorff coil (4).
7. regulate the method that part strength distributes when described a kind of high-strength steel material is shaped according to claim 1, it is characterized in that: the high-strength steel blank (1) in the described step 1 is sheet material, and the local heating mode adopts snail formula ruhmkorff coil (5).
8. regulate the method that part strength distributes when described a kind of high-strength steel material is shaped according to claim 1, it is characterized in that: the high-strength steel blank (1) in the described step 1 is sheet material, and the local heating mode adopts plane side-by-side ruhmkorff coil (6).
9. regulate the method that part strength distributes when described a kind of high-strength steel material is shaped according to claim 1, it is characterized in that: the local heating temperature in the described step 1 is 500 ℃.
10. regulate the method that part strength distributes when described a kind of high-strength steel material is shaped according to claim 1, it is characterized in that: in the described step 2 high-strength steel blank (1) is incubated 15min.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103900316A (en) * | 2014-04-15 | 2014-07-02 | 吴江市赛纳电子科技有限公司 | Fast cooling device for mold production |
| CN106086648A (en) * | 2016-07-22 | 2016-11-09 | 大连理工大学 | A kind of method realizing there is the medium managese steel part capability gradient distribution of TRIP effect |
| CN107557550A (en) * | 2017-08-22 | 2018-01-09 | 大连理工大学 | A kind of intensity adjustable high-strength steel automobile part preparation method |
| CN108890134A (en) * | 2018-08-02 | 2018-11-27 | 吉林大学 | A kind of strong dual phase steel laser assembly solder plate welding seams plasticizing assembly of superelevation and technique |
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| CN1191162A (en) * | 1997-02-18 | 1998-08-26 | 熊中实 | Process and apparatus for locally heating extrusion of profile cross-section steel |
| CN1699608A (en) * | 2004-05-17 | 2005-11-23 | 都美工业株式会社 | Heat processing unit case heat treating method and its device |
| CN102010966A (en) * | 2010-12-24 | 2011-04-13 | 沈阳飞机工业（集团）有限公司 | Induction heating localized tempering process for 30CrMnSiNi2A part |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1100474A (en) * | 1993-09-15 | 1995-03-22 | 冶金工业部重庆钢铁设计研究院 | Intermediate-frequency induction heating apparatus for switch tongue |
| CN1191162A (en) * | 1997-02-18 | 1998-08-26 | 熊中实 | Process and apparatus for locally heating extrusion of profile cross-section steel |
| CN1699608A (en) * | 2004-05-17 | 2005-11-23 | 都美工业株式会社 | Heat processing unit case heat treating method and its device |
| CN102010966A (en) * | 2010-12-24 | 2011-04-13 | 沈阳飞机工业（集团）有限公司 | Induction heating localized tempering process for 30CrMnSiNi2A part |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103900316A (en) * | 2014-04-15 | 2014-07-02 | 吴江市赛纳电子科技有限公司 | Fast cooling device for mold production |
| CN106086648A (en) * | 2016-07-22 | 2016-11-09 | 大连理工大学 | A kind of method realizing there is the medium managese steel part capability gradient distribution of TRIP effect |
| CN107557550A (en) * | 2017-08-22 | 2018-01-09 | 大连理工大学 | A kind of intensity adjustable high-strength steel automobile part preparation method |
| CN108890134A (en) * | 2018-08-02 | 2018-11-27 | 吉林大学 | A kind of strong dual phase steel laser assembly solder plate welding seams plasticizing assembly of superelevation and technique |
| CN108890134B (en) * | 2018-08-02 | 2020-04-17 | 吉林大学 | Ultrahigh-strength dual-phase steel laser tailor-welded blank weld joint plasticizing device and process |
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Application publication date: 20130327 |