CN105088046A - Composite alterant capable of improving thermal fatigue resistant performance of zinc-aluminum-copper-nickel-molybdenum-manganese alloy - Google Patents
Composite alterant capable of improving thermal fatigue resistant performance of zinc-aluminum-copper-nickel-molybdenum-manganese alloy Download PDFInfo
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- CN105088046A CN105088046A CN201410198655.4A CN201410198655A CN105088046A CN 105088046 A CN105088046 A CN 105088046A CN 201410198655 A CN201410198655 A CN 201410198655A CN 105088046 A CN105088046 A CN 105088046A
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Abstract
The invention discloses a composite alterant capable of improving the thermal fatigue resistant performance of a zinc-aluminum-copper-nickel-molybdenum-manganese alloy, and belongs to the technical field of zinc-aluminum alloy preparation. The alterant is characterized by being composed of the following components in percentage by weight: 10 to 15% of Co, 8 to 12% of Sr, 8 to 12% of Na, 6 to 10% of Ca, 6 to 10% of Mo, 3 to 7% of Cr, 3 to 7% of Ce, 1 to 4% of Eu, 1 to 4% of Sm, 1 to 4% of B, and the balance being aluminum. The alterant is a block-shaped hoary alloy, the granularity is in a range of 0.5 to 40 mm, the melting point is in a range of 700 to 1000 DEG C, and the addition amount of composite alterant is in a range of 0.3 to 1.1%.
Description
Technical field
The invention belongs to aluminium zinc preparing technical field, refer in particular to a kind of compound modifier improving zinc-aluminium copper nickel molybdenum manganese alloy thermal fatigue property.
Background technology
Cast Zn-Al alloy relies on excellent mechanical property, machinability, abrasion resistance properties, less energy-consumption, the good characteristics such as pollution-free to obtain in engineering and apply comparatively widely.At present, productive life uses aluminium zinc replace brass, tinbronze, xantal for structural part, wearing piece, plastics and rubber mold etc., there is the very strong market competitiveness.But the linear expansivity of aluminium zinc is comparatively large, poor dimensional stability, under room temperature or middle high temperature, material occurs to continue not reply expansion, and this, for the operating mode being applied to shrink-fit and velocity variations, just produces serious problems.In addition, this material is when higher than 120 DEG C, generation softened, mechanical behavior under high temperature, mechanical property sharply decline, and lose use properties, these shortcomings make its working temperature be limited in less than 120 DEG C, only be applicable to low-speed heave-load, therefore, if there is way to make up these deficiencies of high alumina zinc base alloy,, greatly must expand the value of its engineer applied.
Due to the eutectic temperature of aluminium zinc and recrystallization temperature lower, thus the hot strength of alloy is low, and the use of aluminium zinc much all involves the environment of high temperature, and thermal fatigue fracture is a use hidden danger important greatly.At present, the research about aluminium zinc thermal fatigue property is little, therefore quite urgent to the research of aluminium zinc thermal fatigue property.The quantitative examination of domestic thermal fatigue is also relatively backward, is more difficult to solve the thermal fatigue problem in production practice.A lot of element is mainly used in improving hot workability and cast structure in aluminium zinc, prevents segregation; Obtain high strength, good thermal fatigue property and wear resisting property.Therefore, the present invention develops a kind of compound modifier improving zinc-aluminium copper nickel molybdenum manganese alloy thermal fatigue property.
Summary of the invention
The present invention develops a kind of compound modifier improving zinc-aluminium copper nickel molybdenum manganese alloy thermal fatigue property.It is characterized by: composition counts by weight percentage, Co10-15%, Sr8-12%, Na8-12%, Ca6-10%, Mo6-10%, Cr3-7%, Ce3-7%, Eu1-4%, Sm1-4%, B1-4%, remaining be aluminium.Described alterant is block canescence alloy, size range 0.5 ~ 40mm, melting range 700 ~ 1000 DEG C.Compound modifier add-on scope is 0.3%-1.1%.
The above-mentioned compound modifier for zinc-aluminium copper nickel molybdenum manganese alloy, composition can be preferably: Co12-13%, Sr10-11%, Na10-11%, Ca8-9%, Mo8-9%, Cr5-6%, Ce5-6%, Eu2-3%, Sm2-3%, B2-3%, remaining be aluminium.Compound modifier add-on preferable range is 0.7%-0.9%.
accompanying drawing explanation
Fig. 1 thermal fatigue specimen size (unit mm)
Fig. 2 does not add compound modifier sample at 20 DEG C-210 DEG C circulations, 7000 crackle figure
Fig. 3 adds 0.3% compound modifier sample at 20 DEG C-210 DEG C circulations, 7000 crackle figure
Fig. 4 adds 0.5% compound modifier sample at 20 DEG C-210 DEG C circulations, 7000 crackle figure
Fig. 5 adds 0.9% compound modifier sample at 20 DEG C-210 DEG C circulations, 7000 crackle figure
Fig. 6 adds 1.1% compound modifier sample at 20 DEG C-210 DEG C circulations, 7000 crackle figure
Fig. 2-6 be times of thermal cycle to 9000 times time, the v-notch place heat fatigue cracking pattern of 5 groups of samples.Along with the increase of times of thermal cycle, crackle continues expansion, and each sample lead crack becomes longer thicker.The crackle adding 0.5-0.9% compound modifier sample is shorter and tiny (Fig. 4-Fig. 5), and lead crack does not occur bifurcated, and matrix of samples intensity keeps better.Mainly because following 4 points, one is that to add composite inoculating dosage moderate, and under thermal stresses effect during notch ductility distortion, complex compound is on good terms and is acted synergistically with matrix, and being not easy to come off causes stress concentration; Two is because the existence of complex compound phase, prevents growing up of the diffusion of atom and crystal grain, improves thermostability and the heat resistance of alloy; Three is that quantity is more, is evenly distributed, and crackle is easy to run into rich complex compound phase because complex compound is of moderate size mutually, when complex compound phase and crack surface come in contact, may cause the closed of crackle; Do not add compound modifier sample (Fig. 2), oxygen easily enters intrinsic silicon, causes high temperature oxidation to react, and facilitates the initiation and propogation of heat fatigue cracking.As shown in Figure 1, the tiny crack be not much connected with breach lead crack is remotely there is in sample from breach, these tiny cracks are formed at intergranular place mostly, and along intergranular expansion, be interconnected trend, form map cracking gradually, crack propagation after facilitating, crackle is by bifurcated to seek best extensions path, and crystal boundary and direction of crack propagation deviation are comparatively large, and crackle is expanded along the crystal boundary of complications.Add 1.1% compound modifier sample lead crack and occurred bifurcated (Fig. 6), surface oxidation is more serious.This complex compound of mainly separating out due to sample is compared greatly, and in Thermal Cycling, large size complex compound compares the flowing of difficult collaborative matrix, is easily subject to piling up of dislocations, thus produces larger stress concentration in complex compound phase and interface.When the shearing stress of slippage is greater than the interface binding power of complex compound phase and matrix, complex compound is met and is come off, and to come off mutually place at complex compound, easy oxidation, and can stress concentration be caused, attract lead crack to expand to this place, lead crack is occurred bifurcated.From above-mentioned analysis, it is minimum to add the crackle that 0.5-0.9% compound modifier sample produces in Thermal Cycling, and the thermal fatigue property reflecting zinc-aluminium copper nickel molybdenum manganese alloy material is best.
embodiment.
Embodiment
With No. A00, industrial aluminium ingot, No. 0, zinc ingot metal, aluminum bronze intermediate alloy, aluminium nickel master alloy, aluminium molybdenum master alloy, aluminium manganese master alloy, compound modifier (wherein W12-16%, Mo12-16%, Zr8-12%, Ni5-10%, Ti4-6%, Sr4-6%, La3-5%, Nb3-5%, V1-3%, Nd1-3%, Pr1-3%, remaining for aluminium), pure magnesium for raw material.Composition counts by weight percentage, and adds with the aluminum bronze intermediate alloy form of cupric 50% in Al37-39%, Cu2-2.5%(), Ni0.4-0.5%(adds with the aluminium nickel master alloy form of nickeliferous 40%), Mo0.3-0.4%(adds with the aluminium molybdenum master alloy form containing molybdenum 40%), Mn0.2-0.3% (adding with the aluminium manganese master alloy form containing Mn40%), compound modifier 0-1.1%, Mg0.014-0.02%, surplus be melting in induction melting furnace after the ratio of Zn is weighed.Melting technology is: first add aluminium ingot, zinc ingot metal, aluminum bronze intermediate alloy, aluminium nickel master alloy, aluminium molybdenum master alloy, aluminium manganese master alloy, compound modifier, after material all melts, be incubated 6min-8min when being warming up to 600 ~ 650 DEG C and make each element homogenizing, for magnesium is pressed in molten metal, with the dehydration ZnCl of containing metal liquid 0.2% by the scaling loss bell jar reducing magnesium
2carry out refining, will to dewater ZnCl with bell jar during refining
2in press-in molten metal, degasification of skimming after leaving standstill 8min-10min, prepares cast when temperature is 560 DEG C-580 DEG C.Casting technique is: sand mold casting, base plate is metal mold, by the blank of melted zinc-aluminium copper nickel molybdenum manganese alloy casting growth 250mm, wide 40mm, high 70mm, different according to the content adding compound modifier, water the zinc-aluminium copper nickel molybdenum manganese alloy blank casting out six groups of compound modifier different contents, its compound modifier add-on is respectively 0%, 0.3%, 0.5%, 0.7%, 0.9%, 1.1%, be then processed into national standard coupon.Room temperature tensile Mechanics Performance Testing is carried out on WE-10 type fluid pressure type tensile testing machine.Go out thermal fatigue sample by linear cutter, thermal fatigue specimen size is long 40mm, wide 10mm, high 5mm, sample top with v-notch, as shown in Figure 1.
Resistance furnace heating is adopted to carry out thermal fatigue test from constraint thermal fatigue tester.Plate tensile sample is installed on four sides of cube jig, ensures that the heating of every block sample is consistent with cool position, and by the upper and lower vertical movement of transmission mechanism, thus the automatization reaching sample heating and cooling completes.Automatic control when employing is established, thermocouple measurement control temperature, sample carries out the thermal cycling of heating Yu cooling between room temperature 20 DEG C to 210 DEG C, adopts counter to carry out Auto-counting, adjusts and keep furnace temperature 210 DEG C, water temperature 20 DEG C (flowing tap water).Rapid heating sample, heating, cooling are once as a circulation, and each circulating-heating time is 120s, and entering the water cooling time is 5s, until predetermined cycle index.For the sample of research heat fatigue cracking germinating, often circulate 500 times, take off sample, surface film oxide is removed in polishing, and surface measurements crack length, using 0.1mm as crack initiation length, write down sample crack initiation cycle index, observe and taken a picture in the germinating position of crackle.For the sample of research crack propagation of thermal fatigue, often circulate 1000 times, take off sample, polishing is also observed.Surface measurements crack length.Table 1 is for adding the impact of different composite alterant on zinc-aluminium copper nickel molybdenum manganese alloy crack length.As can be seen from Table 1, when compound modifier add-on is 0.5%-0.9%, zinc-aluminium copper nickel molybdenum manganese alloy thermal fatigue property is best.
Table 1 zinc-aluminium copper nickel molybdenum manganese alloy add different composite alterant 20 DEG C-210 DEG C circulation after crack length (mm)
| Cycle index | 0% | 0.3% | 0.5% | 0.7% | 0.9% | 1.1% |
| 1000 | 0.086 | 0 | 0 | 0 | 0 | 0 |
| 2000 | 0.182 | 0.031 | 0 | 0 | 0 | 0.024 |
| 3000 | 0.344 | 0.056 | 0.035 | 0.036 | 0.034 | 0.075 |
| 4000 | 0.521 | 0.089 | 0.103 | 0.108 | 0.108 | 0.152 |
| 5000 | 0.756 | 0.123 | 0.187 | 0.191 | 0.190 | 0.212 |
| 6000 | 0.913 | 0.161 | 0.256 | 0.259 | 0.257 | 0.303 |
| 7000 | 1.889 | 0.612 | 0.319 | 0.315 | 0.320 | 0.438 |
| 8000 | 2.616 | 0.527 | 0.387 | 0.389 | 0.390 | 0.513 |
| 9000 | 3.352 | 0.841 | 0.457 | 0.456 | 0.455 | 0.587 |
Claims (3)
1. one kind is improved the compound modifier of zinc-aluminium copper nickel molybdenum manganese alloy thermal fatigue property, it is characterized by: composition counts by weight percentage, Co10-15%, Sr8-12%, Na8-12%, Ca6-10%, Mo6-10%, Cr3-7%, Ce3-7%, Eu1-4%, Sm1-4%, B1-4%, remaining be aluminium; Described alterant is block canescence alloy, size range 0.5 ~ 40mm, melting range 700 ~ 1000 DEG C; Compound modifier add-on scope is 0.3%-1.1%.
2. a kind of compound modifier improving zinc-aluminium copper nickel molybdenum manganese alloy thermal fatigue property according to claim 1, composition can be preferably: Co12-13%, Sr10-11%, Na10-11%, Ca8-9%, Mo8-9%, Cr5-6%, Ce5-6%, Eu2-3%, Sm2-3%, B2-3%, remaining be aluminium.
3. a kind of compound modifier improving zinc-aluminium copper nickel molybdenum manganese alloy thermal fatigue property according to claim 1, add-on preferable range is 0.7%-0.9%.
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Citations (5)
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| CN1793394A (en) * | 2004-12-24 | 2006-06-28 | 株式会社神户制钢所 | Copper alloy having bendability and stress relaxation property |
| CN102286712A (en) * | 2011-09-21 | 2011-12-21 | 镇江忆诺唯记忆合金有限公司 | Process for enhancing thermal fatigue performance of aluminum-silicon alloy |
| CN102312112A (en) * | 2011-10-25 | 2012-01-11 | 镇江忆诺唯记忆合金有限公司 | Composite modifier for improving thermal fatigue performances of aluminum-silicon alloy |
| CN102719722A (en) * | 2012-06-25 | 2012-10-10 | 镇江忆诺唯记忆合金有限公司 | Composite modifier capable of improving overall performance of zinc-aluminum alloy |
| CN103103382A (en) * | 2012-11-09 | 2013-05-15 | 安徽欣意电缆有限公司 | Al-Fe-Rh-RE aluminium alloy, preparation method thereof and power cable |
-
2014
- 2014-05-13 CN CN201410198655.4A patent/CN105088046A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1793394A (en) * | 2004-12-24 | 2006-06-28 | 株式会社神户制钢所 | Copper alloy having bendability and stress relaxation property |
| CN102286712A (en) * | 2011-09-21 | 2011-12-21 | 镇江忆诺唯记忆合金有限公司 | Process for enhancing thermal fatigue performance of aluminum-silicon alloy |
| CN102312112A (en) * | 2011-10-25 | 2012-01-11 | 镇江忆诺唯记忆合金有限公司 | Composite modifier for improving thermal fatigue performances of aluminum-silicon alloy |
| CN102719722A (en) * | 2012-06-25 | 2012-10-10 | 镇江忆诺唯记忆合金有限公司 | Composite modifier capable of improving overall performance of zinc-aluminum alloy |
| CN103103382A (en) * | 2012-11-09 | 2013-05-15 | 安徽欣意电缆有限公司 | Al-Fe-Rh-RE aluminium alloy, preparation method thereof and power cable |
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Application publication date: 20151125 |