CN108642404A - Antifatigue corrosion-resistant twinning-induced plasticity steel of one kind and preparation method thereof - Google Patents
Antifatigue corrosion-resistant twinning-induced plasticity steel of one kind and preparation method thereof Download PDFInfo
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
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Abstract
The invention discloses a kind of antifatigue corrosion-resistant twinning-induced plasticity steels and preparation method thereof.First using the alloy design of high Mn, high C and high Cr in the present invention, again by adding the assistant alloys elements such as N, Ti and Nb, in combination with solid solution appropriate, aging strengthening model, TWIP steel is set to obtain ideal reinforcing effect and passivation effect, to ensure that material has good obdurability, anti-fatigue performance and corrosion resisting property, help to solve the fundamental issue that obdurability is insufficient existing for general T WIP steel or stainless steels or corrosion resistance is poor.
Description
Technical field
The present invention relates to steel alloy manufacture fields, are specifically designed the antifatigue corrosion-resistant twinning-induced plasticity steel of one kind and its system
Preparation Method.
Background technology
Twinning-induced plasticity steel (TWIP steel) is a kind of single phase austenite steel, has high obdurability especially plasticity,
Have wide practical use in the fields such as aerospace, national defence and vehicle, road, bridge, building, pipeline, low-temperature storage tank.It is twin
The basic process of raw induced plasticity steel is：Melting forms alloy, forged, rolling under vacuum electric furnace inert atmosphere protection
Forming, then the thermally treated isometric austenite crystal for obtaining various grain sizes.The typical mechanical property of twinning-induced plasticity steel is：
250~350MPa of yield strength, 500~600MPa of tensile strength, elongation after fracture 70~85%.
But since grain surface lacks passivation layer, the corrosion resistance of TWIP steel is poor.Studies have shown that since Al is in acidity
In solution non-passivation tendency and Fe dissolving, corrosion resistance of the Fe-Mn-Al-Si systems TWIP steel in acidic corrosive media compared with
Difference；In the neutral solutions such as salt, since Al has very strong film forming to be inclined to, therefore the corrosion resistance of Fe-Mn-Al-Si systems TWIP steel is slightly good
In acid solution；For alkaline solution, due to the passivation effect of Mn and Fe, the corrosion resistance of Fe-Mn-Al-Si systems TWIP steel
There is no significant difference with general structure steel.On the whole, corrosion resistance of the TWIP steel in aqueous environments is well below stainless steel.
The low disadvantage of TWIP steel corrosion resistances, at limiting one of its widely applied important conditionality factor.
As other Fe based alloys, the corrosion resistance of TWIP steel is improved, also needs to add Cr appropriate wherein.This be because
The passivation layer that rich Cr can be formed in grain surface for Cr, prevents the formation of micro cell, so as to avoid grain boundary corrosion.In addition, Cr
Low misfit energy low angle boundary (2~10 °) can also be increased, therefore be also beneficial to improve the corrosion resisting property of TWIP steel.But Cr is closed
Aurification is totally unfavorable to the mechanical property especially plasticity of TWIP steel.It is reported that with the TWIP steel of Cr, N assistant alloy,
Elongation after fracture is only 33% or so.When Cr contents increase to 4% by 1%, elongation after fracture then further drops to 30% left side
The right side is significantly less than general Fe-Mn-Al-Si systems and Fe-Mn-C systems TWIP steel (A >=70%).Therefore, passing through Cr alloyings
It is corrosion proof simultaneously to improve TWIP steel, it must also be to the stability of austenite structure, stacking fault energy, deformation mechanism and mechanical property
Variation carries out system research, to reduce the negative effect of Cr generations.
On the other hand, it is relatively low to be also allowed to fatigue life for the lower intensity of TWIP steel especially yield strength, it is difficult to meet week
Military service demand under the effect of phase fatigue load.Although TWIP can be improved to a certain extent by the deformation strengthenings such as cold rolling technique
The yield strength and tensile strength of steel, but this schedule of reinforcement keeps the loss in toughness of material larger, is equally unfavorable for the anti-of material
Fatigue behaviour.Therefore, to improve the anti-fatigue performance of TWIP steel, its high-ductility must be kept as far as possible while improving its intensity
Property.For TWIP, the influence that the design of the alloy taken obtains process means reply Mechanism of Deformation Twin is as small as possible, to
Stress concentration caused by inhibiting local high stress caused by dislocation movement by slip or slip dislocation to be accumulated in grain boundaries plug as wide as possible, with
Make material while obtaining high-strength, high-ductility comprehensive performance.
According to above-mentioned principle, the present invention improves the corrosion resistance and anti-fatigue performance of TWIP by following two methods：(1) lead to
Excessively high Mn ensures that material has suitable stacking fault energy, generates twinning-induced plasticity effect.(2) crystal grain table is obtained by adding Cr
Face passivating film；The molten C abilities that N expands austenite phase are added, reduce the tendency that C is precipitated；The C in the stabilized matrixes such as Ti, Nb is added,
The precipitation for inhibiting the carbide containing Cr, to improve the corrosion resistance of TWIP steel.(3) high C, the combination of high N and its relative amount control are utilized
System, in conjunction with solid solution appropriate, aging strengthening model, obtains ideal solution strengthening and precipitation strength effect, to compensate Cr alloyings
The degeneration of the material mechanical performance brought improves the obdurability and anti-fatigue performance of TWIP steel.
Invention content
Present invention aims at provide a kind of preparation method of antifatigue corrosion-resistant twinning-induced plasticity steel.By C, Mn,
The comprehensive design of Cr, N, Ti and Nb obtain required austenitic matrix and hardening constituent in conjunction with solid solution appropriate and aging strengthening model
The tissue of Dispersed precipitate realizes material anti-fatigue performance and the target that corrosion resisting property improves simultaneously.
To achieve the goals above, the present invention adopts the following technical scheme that：
A kind of preparation method of antifatigue corrosion-resistant twinning-induced plasticity steel, includes the following steps：
(1) melting：By raw material simple substance C, Mn, Cr, N, Ti, Nb, according to target ingredient carries out dispensing, and the raw material prepared is put into
Into vacuum induction smelting furnace, melting is carried out under protection of argon gas, steel ingot is poured into after melting.
(2) high temperature pulls out：The steel ingot that step (1) is obtained carries out surface turnery processing, 2~5mm of processing capacity, after turning
Steel ingot is drawn into the circle of 30~40mm of diameter by forging ratio 10~45 by steel ingot in an axial direction after 900~1100 DEG C of Homogenization Treatments
Then base is cut into the pole of long 800~1000mm.
(3) hot-rolled pipe：The bar that step (2) obtains is heated to 950~1100 DEG C, 0.5~1.0h is kept the temperature, then rolls
At the unlimited tubing of 0.8~2.5mm of wall thickness, 8.0~15.0mm of outer diameter, length.It can be according to slab sclerotic conditions in the operation of rolling
Carry out intermediate softening annealing, 950~1100 DEG C of annealing temperature, 0.5~1.0h of soaking time.
(4) high warm forging plate：The steel ingot that step (1) is obtained carries out surface turnery processing, 2~5mm of processing capacity, after turning
Steel ingot steel ingot forged into an axial direction after 900~1100 DEG C of Homogenization Treatments, by forging ratio 5~8 30~40mm of thickness, it is wide by 200~
The slab of 300mm, length >=600mm.
(5) hot rolled plate：The heating of plate blank that step (3) is obtained keeps the temperature 0.5~1.0h, then rolls to 950~1100 DEG C
At the unlimited slab of 8~10mm of thickness, wide 500~600mm, length.It can be carried out according to slab sclerotic conditions in the operation of rolling intermediate
Soft annealing, 950~1100 DEG C of annealing temperature, 0.5~1.0h of soaking time.
(6) cold-reduced sheet：By step (4) obtain slab be rolled at room temperature 0.5~2.0mm of thickness, wide 500~600mm,
The unlimited thin plate of length.
A kind of preparation method of the antifatigue corrosion-resistant twinning-induced plasticity steel, it is characterised in that：The target
Ingredient is following (wt.%)：C：0.20~0.50；Mn：20~30；Cr：12~18；Si：0.5~0.8；Ti：0.10~0.25；
Nb：0.10~0.25；N：0.3~0.8；Remaining is Fe.
The present invention also provides what is processed according to above-mentioned preparation method to have height tough, antifatigue, corrosion resistant twin
Induced plasticity steel.
The present invention has the beneficial effect that：
The shortcomings of present invention is for the lower intensity of TWIP steel, fatigue life and corrosion resistance and existing reinforcing and passivation
The deficiency of technique, first using the alloy design of high Mn, high C and high Cr, then by adding the assistant alloys elements such as N, Ti and Nb,
In combination with solid solution appropriate, aging strengthening model, TWIP steel is set to obtain ideal reinforcing effect and passivation effect, to ensure material
Material has good obdurability, anti-fatigue performance and corrosion resisting property.
Twinning-induced plasticity steel produced by the present invention has high-strength tenacity, high fatigue life and high corrosion-resistant.Specific feature
It is as follows：
(1) main chemical compositions are (wt.%)：C：0.20~0.50；Mn：20~30；Cr：12~18；Si：0.5~
0.8；Ti：0.10~0.25；Nb：0.10~0.25；N：0.3~0.8；Remaining is Fe.
(2) metallographic structure is：The isometric austenite grain and its equally distributed Second Phase Particle of size adjustable, wherein difficult to understand
100~1000 μm of family name's body equiax crystal diameter, 0.1~0.5 μm of Second Phase Particle diameter, volume fraction 1~5%.
(3) Typical tensile mechanical property is：300~650MPa of yield strength, 780~860MPa of tensile strength, has no progeny and stretches
Long rate 40~60%.
(4) typical fatigue performance is：When maximum stress is 550MPa, fatigue life 1010；Fatigue life is 106When, it can
The fatigue load born is 690MPa；Fatigue limit (bears 107It is secondary to recycle the maximum load not being broken) it is 660MPa.
(5) corrosion resistance：Impregnated in 5wt.%NaCl solution at room temperature after 700~1000h without apparent corrosion, corrosion resistance with
1Cr18Ni9Ti stainless steels are suitable.
Description of the drawings
Fig. 1：The Typical grain tissue of general T WIP steel；
Fig. 2：The Typical grain tissue for the antifatigue anti-corrosion TWIP steel that the present embodiment obtains；
Fig. 3：The Typical tensile stress-strain diagram and performance of general T WIP steel；
Fig. 4：The Typical tensile stress-strain diagram and performance of domestic 1Cr18Ni9Ti stainless steels；
Fig. 5：The Typical tensile stress-strain diagram and performance of import 1Cr18Ni9Ti stainless steels；
Fig. 6：The Typical tensile stress-strain diagram and performance for the TWIP steel that the present embodiment obtains：(a) it is dissolved state；(b) cold
Roll+heat treatment state；
Fig. 7：The TWIP steel fatigue lives and its comparison with stainless steel that the present embodiment obtains；
Fig. 8：The twinning-induced plasticity steel polarization curve that the present embodiment obtains and its comparison with 1Cr18Ni9Ti stainless steels.
Specific implementation mode
Embodiment 1
High fatigue resistance and corrosion resisting property TWIP steel, main chemical compositions are (wt.%)：C：0.31；Mn：24.9；
Cr：12.2；N：0.40%；Ti：0.10；Nb：0.12；Remaining is Fe.
Preparation method is as follows：
(1) according to target ingredient carries out dispensing, melting is carried out in vacuum induction furnace, under argon gas protection, after melting
Pour into steel ingot；
(2) surface of steel ingot turnery processing amount is that 2mm obtains diameter 40mm, length through 1000 DEG C of high temperature forgings and cutting
The pole of 1000mm.
(3) above-mentioned pole is heated in resistance furnace, keep the temperature after water cooling.10 DEG C/min of heating rate, holding temperature 1200
DEG C, soaking time 24 hours.
(4) pole after above-mentioned higher temperature solid solution is heated in resistance furnace, water cooling after heat preservation.600 DEG C of holding temperature,
Soaking time 8 hours.
Drawing mechanical performance tests coupon：It is sampled in an axial direction from the pole after above-mentioned heat treatment, with linear cutter at mute
Bell-shaped plate tensile test bar.Coupon length is 110mm, and gauge length section size is 6 × 2 × 40mm.
Fatigue property test coupon：It is sampled in an axial direction from the pole after above-mentioned heat treatment, with linear cutter at dumb-bell shape
Plate tensile fatigue coupon.The long 164mm of coupon, gauge length segment length 80mm, arc radius 104mm.Coupon surface is polished before test,
Polishing, roughness≤3.2.
Drawing mechanical performance is tested：One directional tensile test is carried out in Material Testing Machine.Rate of extension is 3mm/min, is surveyed
Obtain yield strength, tensile strength, elongation after fracture and the tensile stress strain curve of material.
Fatigue property test：Drawing pulling fatigue experimental is carried out on HF fatigue testing machine.Application load frequency is 92Hz, is carried
Lotus waveform is sinusoidal waveform, and fatigue loading ratio R is 0.1.
The general T WIP steel and 1Cr18Ni9Ti stainless steels of comparison are sampled from Related product, processing method and coupon ruler
It is very little identical as TWIP steel of the present invention.
The yield strength of general T WIP, 1Cr18Ni9Ti stainless steel and TWIP steel of the present invention, tensile strength and elongation of having no progeny
Rate is respectively as shown in attached drawing 4,5 and 6；Anti-fatigue performance is as shown in Fig. 7；Corrosion resisting property difference is as shown in Fig. 8.
The TWIP steel that the present invention is prepared compares such as with the main performance of general T WIP steel and 1Cr18Ni9Ti stainless steels
Shown in table 1, table 2 and table 3.
1 main mechanical properties of table compares
| Material | Yield strength (MPa) | Tensile strength (MPa) | Elongation after fracture (%) |
| General T WIP steel | 250~350 | 550~600 | 70~85 |
| 1Cr18Ni9Ti stainless steels | 240~350 | 650~680 | 45~50 |
| TWIP steel of the present invention | 640~700 | 750~850 | 45~75 |
2 corrosion resistance of table compares
3 fatigue behaviour of table compares
As can be seen from Table 1, antifatigue corrosion-resistant TWIP steel provided by the invention, with general T WIP steel and 1Cr18Ni9Ti
Stainless steel is compared, there is higher yield strength and tensile strength and with the former similar plasticity and with it is anti-corrosion similar in the latter
Property.Since with excellent comprehensive mechanical property, TWIP steel provided by the invention shows anti-fatigue performance very outstanding.Nothing
By being fatigue limit, same load fatigue life or same life fatigue load, it is significantly better than that 1Cr18Ni9Ti is stainless
Steel.Therefore, structure obdurability, fatigue resistance and corrosion resistance etc. are being improved, TWIP steel provided by the invention has outstanding
Advantage, it will help solve the fundamental issue that obdurability is insufficient existing for general T WIP steel or stainless steels or corrosion resistance is poor.
Claims (3)
1. a kind of preparation method of antifatigue corrosion-resistant twinning-induced plasticity steel, which is characterized in that include the following steps：
(1) melting：By raw material simple substance C, Mn, Cr, N, Ti, Nb, according to target ingredient carries out dispensing, and the raw material prepared is put into very
In sky induction smelting furnace, melting is carried out under protection of argon gas, steel ingot is poured into after melting；
(2) high temperature pulls out：The steel ingot that step (1) is obtained carries out surface turnery processing, 2~5mm of processing capacity, the steel ingot after turning
After 900~1100 DEG C of Homogenization Treatments, steel ingot is drawn into the round billet of 30~40mm of diameter in an axial direction by forging ratio 10~45, so
It is cut into the pole of long 800~1000mm afterwards；
(3) hot-rolled pipe：The bar that step (2) obtains is heated to 950~1100 DEG C, 0.5~1.0h is kept the temperature, then rolls wall-forming
The unlimited tubing of 0.8~2.5mm of thickness, 8.0~15.0mm of outer diameter, length.It can be carried out according to slab sclerotic conditions in the operation of rolling
Intermediate softening is annealed, 950~1100 DEG C of annealing temperature, 0.5~1.0h of soaking time；
(4) high warm forging plate：The steel ingot that step (1) is obtained carries out surface turnery processing, 2~5mm of processing capacity, the steel ingot after turning
After 900~1100 DEG C of Homogenization Treatments, steel ingot forged into an axial direction by forging ratio 5~8 30~40mm of thickness, it is wide by 200~
The slab of 300mm, length >=600mm；
(5) hot rolled plate：The heating of plate blank that step (3) is obtained keeps the temperature 0.5~1.0h, is then rolled into thickness to 950~1100 DEG C
The unlimited slab of 8~10mm, wide 500~600mm, length.Intermediate softening can be carried out in the operation of rolling according to slab sclerotic conditions
Annealing, 950~1100 DEG C of annealing temperature, 0.5~1.0h of soaking time；
(6) cold-reduced sheet：The slab that step (4) obtains is rolled into 0.5~2.0mm of thickness, wide 500~600mm, length at room temperature
Unlimited thin plate.
2. a kind of preparation method of antifatigue corrosion-resistant twinning-induced plasticity steel according to claim 1, it is characterised in that：
The target component is following (wt.%)：C：0.20~0.50；Mn：20~30；Cr：12~18；Si：0.5~0.8；Ti：
0.10~0.25；Nb：0.10~0.25；N：0.3~0.8；Remaining is Fe.
What 3. the preparation method of twinning-induced plasticity steel as claimed in claim 1 or 2 processed have it is high it is tough, antifatigue,
Corrosion resistant twinning-induced plasticity steel.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110103530A (en) * | 2019-06-04 | 2019-08-09 | 河北工业大学 | A kind of high-performance is anti-corrosion TWIP/ stainless steel multilayer composite material and preparation method |
| CN112359267A (en) * | 2020-10-27 | 2021-02-12 | 中国科学院合肥物质科学研究院 | Damping structure based on anti-fatigue twinning induced plasticity steel and preparation method |
| CN113278908A (en) * | 2021-04-23 | 2021-08-20 | 中国科学院合肥物质科学研究院 | High-strength-toughness corrosion-resistant TWIP steel and preparation method thereof |
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| CN102365382A (en) * | 2009-03-10 | 2012-02-29 | 麦克思普朗克铁研究院有限公司 | Corrosion-resistant austenitic steel |
| CN106148660A (en) * | 2016-07-05 | 2016-11-23 | 中国科学院合肥物质科学研究院 | A kind of preparation method of deformed grains/partial, re-crystallization tissue twinning-induced plasticity steel |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102365382A (en) * | 2009-03-10 | 2012-02-29 | 麦克思普朗克铁研究院有限公司 | Corrosion-resistant austenitic steel |
| CN106148660A (en) * | 2016-07-05 | 2016-11-23 | 中国科学院合肥物质科学研究院 | A kind of preparation method of deformed grains/partial, re-crystallization tissue twinning-induced plasticity steel |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110103530A (en) * | 2019-06-04 | 2019-08-09 | 河北工业大学 | A kind of high-performance is anti-corrosion TWIP/ stainless steel multilayer composite material and preparation method |
| CN110103530B (en) * | 2019-06-04 | 2023-03-31 | 河北工业大学 | High-performance corrosion-resistant TWIP/stainless steel multilayer composite material and preparation method thereof |
| CN112359267A (en) * | 2020-10-27 | 2021-02-12 | 中国科学院合肥物质科学研究院 | Damping structure based on anti-fatigue twinning induced plasticity steel and preparation method |
| CN112359267B (en) * | 2020-10-27 | 2021-09-24 | 中国科学院合肥物质科学研究院 | Damping structure based on anti-fatigue twinning induced plasticity steel and preparation method |
| CN113278908A (en) * | 2021-04-23 | 2021-08-20 | 中国科学院合肥物质科学研究院 | High-strength-toughness corrosion-resistant TWIP steel and preparation method thereof |
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|---|---|
| CN108642404B (en) | 2020-06-09 |
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