CN105177455B - A kind of 2400MPa levels High-alloy Ultra-high Strength Steel - Google Patents
A kind of 2400MPa levels High-alloy Ultra-high Strength Steel Download PDFInfo
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- CN105177455B CN105177455B CN201510645184.1A CN201510645184A CN105177455B CN 105177455 B CN105177455 B CN 105177455B CN 201510645184 A CN201510645184 A CN 201510645184A CN 105177455 B CN105177455 B CN 105177455B
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Abstract
The invention belongs to technical field of metal material, is related to a kind of 2400MPa levels High-alloy Ultra-high Strength Steel.Its chemical composition ranges is as follows by weight：C：0.20%~0.30%, Cr：1.0%~3.0%, Ni：9.5%~10.5%, Co：7.0%~9.0%, Mo：1.3%~2.0%, Al：1.3%~2.0%, Nb≤0.10%, La≤0.10%, surplus are iron.The High-alloy Ultra-high Strength Steel of the present invention, tensile strength >=2400MPa, yield strength >=2100MPa, and there is good plasticity and toughness.The steel can be used as high-strength structure part, has on aircraft and engine and has been widely used.
Description
Technical field
The invention belongs to technical field of metal material, is related to a kind of 2400MPa levels High-alloy Ultra-high Strength Steel.
Background technology
With the development of aircraft industry, to the lightweight requirements more and more higher of structural member, so as to be proposed to unimach
Higher requirement, it is desirable to higher intensity, good plasticity and toughness.At present High-alloy Ultra-high Strength Steel in, with
The AerMet100 steel combination properties of Carpenter companies of U.S. exploitation are best, and the steel has 2000MPa or so tensile strength
WithThe excellent fracture toughness of left and right.On the basis of AerMet100 steel, Carpenter companies of the U.S. develop again
Intensity higher AerMet310 and AerMet340 steel.The actual tensile strength of AerMet340 steel can reach 2379MPa, slightly
Higher than 340KSi (2343MPa), but fracture toughness is reduced toThe unimach of AerMet series has one altogether
The shortcomings that same, be exactly noble element Co, the Co content containing more amount more than 14%, thus price is costly.The U.S.
QuesTek companies had developed M54 steel later, although reducing Co contents on the basis of AerMet100 steel, tensile strength and
AerMet100 steel is the same, only 2000MPa or so.
The content of the invention
The purpose of the present invention is：A kind of tensile strength >=2400MPa, yield strength >=2100MPa are researched and developed, and with good
The 2400MPa level High-alloy Ultra-high Strength Steels of good plasticity and toughness.
The technical scheme is that：2400MPa level High-alloy Ultra-high Strength Steel chemical composition ranges are as follows by weight：
C：0.20%~0.30%, Cr：1.0%~3.0%, Ni：9.5%~10.5%, Co：7.0%~9.0%, Mo：1.3%~
2.0%, Al：1.3%~2.0%, Si≤0.10%, Mn≤0.10%, Nb≤0.10%, La≤0.10%, surplus are iron.
The heat treating regime that above-mentioned High-alloy Ultra-high Strength Steel obtains more than 2400MPa tensile strength is as follows：
Quenching：900 DEG C~1000 DEG C, it is incubated 0.5h~2h, water cooling, oil cooling or air cooling；
Cold treatment：- 50 DEG C~-80 DEG C, 1h~3h is incubated, room temperature is returned back in air；
Timeliness：520 DEG C~560 DEG C, it is incubated 3h~8h, air cooling.
Cold treatment and timeliness can be carried out twice.
The present invention has the advantage that is with beneficial effect：The present invention is combined reinforced with Al, Mo, strengthens significant effect；This hair
Bright unimach its tensile strength >=2400MPa, yield strength >=2100MPa, specific strength are high-strength more than 1300MPa levels
Titanium alloy is spent, while there is good plasticity and toughness, Co contents are no more than 9%, have good economy concurrently, open superelevation
Wide purposes of the strength steel in aviation field.It is current intensity highest unimach.
Embodiment
The present invention is described in further details below.
1) chemical composition ranges
The High-alloy Ultra-high Strength Steel of the present invention, its composition range are as follows by weight：C：0.20%~0.30%, Cr：
1.0%~3.0%, Ni：9.5%~10.5%, Co：7.0%~9.0%, Mo：1.3%~2.0%, Al：1.3%~
2.0%, Si≤0.10%, Mn≤0.10%, Nb≤0.10%, La≤0.10%, surplus are iron.
The effect of each chemical element is as follows above：
C：Main intensified element, gap solution strengthening is produced, form alloy carbide Mo2C, increase post-curing peak value,
Obtain high intensity.With the increase of C content, the intensity of alloy improves, but toughness reduces, and damages welding performance.Therefore C content
It should control 0.20%~0.30%.
Cr：Corrosion resistance is improved, and has solution strengthening effect, may replace Mo2Mo in C forms (Mo, Cr)2C, promote secondary
Sclerous reaction, reduce Mo2C Precipitation Temperature, overaging sensitiveness is improved, reduce tempering resistance.Cr contents are more than 3%, by force
Degree will decline.For 18Ni types Maraging steel because being free of Cr, corrosion resistance is poor.Therefore Cr contents should control 1.0%~
3.0%.
Mo：Main intensified element, alloy carbide Mo2C formation element, it is the reason for forming post-curing peak.With
The raising of Mo contents, the rise of post-curing peak, the intensity of alloy improves, but too high Mo contents will reduce toughness.Therefore Mo contains
Amount should be controlled 1.3%~2.0%.
Ni：Toughness element is improved, appropriate Ni is the guarantee that steel obtains high tenacity.But too high Ni contents will increase in steel
The amount of retained austenite, reduce intensity.Therefore Ni contents should be controlled 9.5%~10.5%.
Co：Although Co can not form compound with other elements, it strongly facilitates post-curing reaction, promotes Mo2C is thin
Small disperse educt.In addition, Co, Mo collective effect can improve the obdurability of alloy.In view of cost-effective, the control of Co contents exists
7%~9%.
Al：One of main intensified element of this alloy, and Ni form NiAl phases, with Mo2The common reinforced alloys of C.Contain with Al
Amount improves, and forms more NiAl phases, alloy strength increase, but toughness reduces.Therefore Al content should control 1.3%~
2.0%.
Nb：Crystal grain thinning element, it should control below 0.10%.
La：Inclusion conditioning element, it should control below 0.10%.
Si：Impurity element, toughness is reduced, should be controlled below 0.10%.
Mn：Impurity element, toughness is reduced, should be controlled below 0.10%.
Other impurities element in alloy, such as S, P, toughness is reduced, should be controlled in relatively low level.
2) smelt
The High-alloy Ultra-high Strength Steel of the present invention can use vacuum induction, vacuum induction+electroslag remelting or vacuum induction+true
The methods of empty electric arc remelting, smelts.
3) cogging is forged
Its cogging of the High-alloy Ultra-high Strength Steel of present invention forging can use the deformation such as conventional forging hammer, forcing press, milling train
Equipment, forging range are 1150 DEG C~900 DEG C.
4) it is heat-treated
The High-alloy Ultra-high Strength Steel of the present invention, the heat treating regime for obtaining more than 2400MPa tensile strength are as follows：
Quenching：900 DEG C~1000 DEG C, it is incubated 0.5h~2h, water cooling, oil cooling or air cooling；
Cold treatment：- 50 DEG C~-80 DEG C, 1h~3h is incubated, room temperature is returned back in air；
Timeliness：520 DEG C~560 DEG C, it is incubated 3h~8h, air cooling.
Cold treatment and timeliness can be carried out twice.
Embodiment 1：
Vacuum induction melting 25kg steel ingots are used first.Ingot scalping simultaneously cuts off progress cogging forging after dead head, forging
Heating-up temperature is made as 1150 DEG C, is swaged into through two fireBar.Chemical analysis, stretching, impact specimen are then taken from bar.
Stretching, impact specimen it is quenched+cold treatment+timeliness after determine tensile property, impact flexibility.
Sample heat treating regime is as follows：
Quenching：900 DEG C, it is incubated 1h, oil cooling；
Cold treatment：- 70 DEG C, 2h is incubated, room temperature is returned back in air；
Timeliness：540 DEG C, it is incubated 5h, air cooling.
Result of the test is shown in Tables 1 and 2.
The chemical composition of table 1 (wt%)
| Composition | C | Cr | Ni | Mo | Co | Al | Nb | La | Si | Mn | S |
| Weight % | 0.25 | 2.07 | 10.16 | 1.64 | 8.07 | 1.54 | 0.05 | 0.003 | 0.04 | 0.05 | 0.002 |
| Composition | P | Fe | |||||||||
| Weight % | 0.005 | Surplus |
The mechanical property of table 2
Embodiment 2：
Vacuum induction melting 25kg steel ingots are used first.Ingot scalping simultaneously cuts off progress cogging forging after dead head, forging
Heating-up temperature is made as 1150 DEG C, is swaged into through two fireBar.Chemical analysis, stretching, impact specimen are then taken from bar.
Stretching, impact specimen it is quenched+cold treatment+timeliness after determine tensile property, impact flexibility.
Sample heat treating regime is as follows：
Quenching：950 DEG C, it is incubated 1h, oil cooling；
Cold treatment：- 70 DEG C, 2h is incubated, room temperature is returned back in air；
Timeliness：540 DEG C, it is incubated 5h, air cooling.
Result of the test is shown in Table 3 and table 4.
The chemical composition of table 3 (wt%)
| Composition | C | Cr | Ni | Mo | Co | Al | Nb | La | Si | Mn | S |
| Weight % | 0.30 | 2.03 | 10.10 | 1.70 | 8.10 | 1.80 | 0.06 | 0.004 | 0.03 | 0.02 | 0.001 |
| Composition | P | Fe | |||||||||
| Weight % | 0.003 | Surplus |
The mechanical property of table 4
Claims (1)
1. a kind of 2400MPa levels High-alloy Ultra-high Strength Steel, it is characterized in that, chemical composition ranges are as follows by weight：C：
0.20%~0.30%, Cr：1.0%~3.0%, Ni：9.5%~10.5%, Co：7.0%~9.0%, Mo：1.3%~
2.0%, Al：1.54%~2.0%, Si≤0.10%, Mn≤0.10%, Nb≤0.10%, La≤0.10%, surplus are iron；
The heat treating regime that above-mentioned High-alloy Ultra-high Strength Steel obtains more than 2400MPa tensile strength is as follows：
Quenching：900 DEG C~1000 DEG C, it is incubated 0.5h~2h, water cooling, oil cooling or air cooling；
Cold treatment：- 50 DEG C~-80 DEG C, 1h~3h is incubated, room temperature is returned back in air；
Timeliness：520 DEG C~560 DEG C, it is incubated 3h~8h, air cooling.
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| CN109182696B (en) * | 2018-11-21 | 2021-11-05 | 中国航发哈尔滨东安发动机有限公司 | Nitriding surface modification method for third-generation carburized steel material |
| US20220213569A1 (en) * | 2019-05-06 | 2022-07-07 | Northwestern University | Ultra-high strength steel and forming methods and applications of same |
| CN115478211A (en) * | 2021-05-31 | 2022-12-16 | 宝武特种冶金有限公司 | Tungsten-molybdenum-niobium element reinforced ultrahigh-strength steel and bar preparation method thereof |
| CN113774290A (en) * | 2021-08-25 | 2021-12-10 | 哈尔滨工程大学 | 1800MPa grade high-ductility high-corrosion-resistance maraging stainless steel and preparation method thereof |
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| CN1029860C (en) * | 1993-01-13 | 1995-09-27 | 冶金工业部钢铁研究总院 | High-strength ductile steel |
| CN101403076B (en) * | 2008-11-14 | 2011-09-21 | 钢铁研究总院 | Composite reinforced high-ductility ultrahigh-strength secondary hardening steel |
| JP2014005493A (en) * | 2012-06-22 | 2014-01-16 | Daido Steel Co Ltd | High strength and high fatigue strength steel having excellent toughness and ductility for saw wire |
| CN103695802A (en) * | 2013-12-23 | 2014-04-02 | 钢铁研究总院 | High-molybdenum high-strength secondary hardening ultra-high-strength steel and preparation method thereof |
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