CN101967587A - Method for improving thermal fatigue degree of aluminium copper alloy by adding manganese - Google Patents
Method for improving thermal fatigue degree of aluminium copper alloy by adding manganese Download PDFInfo
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- CN101967587A CN101967587A CN 201010508932 CN201010508932A CN101967587A CN 101967587 A CN101967587 A CN 101967587A CN 201010508932 CN201010508932 CN 201010508932 CN 201010508932 A CN201010508932 A CN 201010508932A CN 101967587 A CN101967587 A CN 101967587A
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Abstract
The invention relates to a method for improving thermal fatigue degree of aluminium copper alloy by adding manganese, belonging to the technical field of aluminium copper alloy. The method is characterized in that the selected chemical compositions of the alloy are as follows according to mass fraction: Cu: 4.5%, Mn: 0.1-0.6% and the balance of Al. The alloy is smelted in a crucible resistor furnace, temperature of the furnace is measured by a thermoelectric couple. When the alloy is smelted, aluminium, copper and aluminum manganese alloy are added to the crucible in sequence; the alloy is heated to be melted; then degasification refining is carried out followed by slagging-off around 5 minute later; afterwards, pouring and air cooling are carried out to prepare a thermal fatigue testing specimen. The thermal fatigue sample has a specification of 40*10*5mm and is a notch specimen with a precrack, the notch is 3mm long. In the invention, the resistor furnace is employed to heat a self limiting thermal fatigue testing machine to carry out the thermal fatigue test, time automatic control is designed and the thermoelectric couple is used to measure and control temperature; the heat and cold circulation is carried out on the specimen within a water temperature of 25 DEG C and a heating temperature of 300 DEG C and automatic counting is carried out by a counter.
Description
Technical field
The invention belongs to the aluminum-copper alloy technical field, refer in particular to a kind of method that manganese improves the aluminum-copper alloy thermal fatigue property that adds.
Background technology
So-called thermal fatigue is meant when material stands temperature variation, produces pulsating stress or cyclic strain because of its free expansion, contraction have been subjected to constraint, finally causes be full of cracks and the destructive phenomenon.The expansion of heat fatigue cracking is the same with the germinating of heat fatigue cracking, has reflected material opposing thermal fatigue destructive ability.Although some material crack initiation life-span is longer, fast because of its crack growth rate, material also can very fast inefficacy; Although and the germinating early of some material crackle because crack propagation is slow, even stops expansion, its actual service life is also longer.Material depends on the expansion life-span of heat fatigue cracking its work-ing life in actual use more, and therefore the research to the heat fatigue cracking expansion has practical significance.
For cast aluminium alloy, Mn is one of main alloy element, and the variation of its add-on has remarkable influence to the mechanical property of alloy.Usually, in the Al-Cu-Mn alloy series, improving mechanical properties, the composition scope of Mn is 0.1～1%, which type of add-on can promptly improve alloy mechanical performance, improve the effect of thermal fatigue property again? this respect does not also have systematic research both at home and abroad.At this problem, the present invention has developed a kind of method that manganese improves the aluminum-copper alloy thermal fatigue property that adds.
Summary of the invention
The purpose of this invention is to provide a kind of method that manganese improves the aluminum-copper alloy thermal fatigue property that adds.It is characterized in that: choosing alloy composition is (massfraction): Cu4.5%, Mn0.1-0.6%, and all the other are Al.Alloy is melting in crucible electrical resistance furnace, and furnace temperature adopts thermocouple measurement, during melting, puts into aluminium, copper, aluminium manganese master alloy successively in crucible, is heated to fusing, and the degasification refining is skimmed after about 5 minutes, and the thermal fatigue sample is produced in cast behind the air cooling then.The thermal fatigue size of sample is 40 * 10 * 5mm, is the notched specimen that precrack is arranged, the long 3mm of breach, and specimen shape and size are as shown in Figure 1.Before the test, grind off specimen surface machining marks and polishing, to eliminate of the influence of specimen surface factor to test-results with sand paper.
Adopt the resistance furnace heating to carry out thermal fatigue test from retraining thermal fatigue tester, plate tensile sample is installed on four sides of cube jig, the heating that guarantees every sample is consistent with cool position, and by transmission mechanism vertical movement up and down, sample heats and the refrigerative automatization is finished thereby reach.Automatic control when employing is established, thermocouple measurement and controlled temperature, sample carries out cold cycling 25 ℃ of water temperatures to heating between 300 ℃, adopt counter to count automatically.
As can be seen from Figure 2, the sample that adds Mn0.1%, Mn0.6% is when cold cycling 3000 times, and tiny crack has begun germinating, and tangible crackle does not appear in the sample that adds Mn0.4% when circulation 3000 times.The sample crack growth rate that comparatively speaking adds Mn0.1% is the fastest, adds Mn0.6% and takes second place, and the sample that adds Mn0.4% is the slowest.More can reflect this conclusion by table 1.
As can be seen from Figure 3, when the cold cycling number of times reached 5000 times, bigger variation had taken place in the crack morphology of each sample, and the influence that add-on is different has also just significantly showed.It is more thick that crackle becomes, and all formed one to two main crackle basically, also irregular several tiny cracks that distributing on main crackle, and the oxidation sign has appearred in the slit of crackle.And crack growth rate is also being accelerated gradually, and the crackle of more every kind of tissue finds to add the longest and the thickest of Mn0.1%, Mn0.6%, adds the shortest and the thinnest of Mn0.4%.More can reflect this conclusion by table 1.
In the above-mentioned aluminum bronze manganese alloy, the add-on of manganese can be preferably: Mn0.4%.
Description of drawings
Fig. 1 thermal fatigue sample synoptic diagram
Fig. 2 heat fatigue cracking pattern (cold cycling 3000 times)
a?Mn0.1％，b?Mn0.4％，c?Mn0.6％
Fig. 3 heat fatigue cracking pattern (cold cycling 5000 times)
a?Mn0.1％，b?Mn0.4％，c?Mn0.6％
Embodiment
Embodiment 1
Choosing alloy composition is (massfraction): Cu4.5%, Mn0.1%, and all the other are Al.Alloy is melting in crucible electrical resistance furnace, and furnace temperature adopts thermocouple measurement, during melting, puts into aluminium, copper, aluminium manganese master alloy successively in crucible, is heated to fusing, and the degasification refining is skimmed after about 5 minutes, and the thermal fatigue sample is produced in cast behind the air cooling then.The thermal fatigue size of sample is 40 * 10 * 5mm, is the notched specimen that precrack is arranged, the long 3mm of breach, and specimen shape and size are as shown in Figure 1.Before the test, grind off specimen surface machining marks and polishing, to eliminate of the influence of specimen surface factor to test-results with sand paper.
Adopt the resistance furnace heating to carry out thermal fatigue test from retraining thermal fatigue tester, plate tensile sample is installed on four sides of cube jig, the heating that guarantees every sample is consistent with cool position, and by transmission mechanism vertical movement up and down, sample heats and the refrigerative automatization is finished thereby reach.Automatic control when employing is established, thermocouple measurement and controlled temperature, sample carries out cold cycling 25 ℃ of water temperatures to heating between 300 ℃, adopt counter to count automatically.
By Fig. 2, Fig. 3 as seen, the heat fatigue cracking that adds Mn 0.1% is long and thick, and by table 1 as seen, when adding Mn 0.1%, the expansion of alloy heat fatigue cracking reaches 24.89mm during cold cycling 5000 times.
Embodiment 2
Choosing alloy composition is (massfraction): Cu4.5%, Mn0.4%, and all the other are Al.Alloy is melting in crucible electrical resistance furnace, and furnace temperature adopts thermocouple measurement, during melting, puts into aluminium, copper, aluminium manganese master alloy successively in crucible, is heated to fusing, and the degasification refining is skimmed after about 5 minutes, and the thermal fatigue sample is produced in cast behind the air cooling then.The thermal fatigue size of sample is 40 * 10 * 5mm, is the notched specimen that precrack is arranged, the long 3mm of breach, and specimen shape and size are as shown in Figure 1.Before the test, grind off specimen surface machining marks and polishing, to eliminate of the influence of specimen surface factor to test-results with sand paper.
Adopt the resistance furnace heating to carry out thermal fatigue test from retraining thermal fatigue tester, plate tensile sample is installed on four sides of cube jig, the heating that guarantees every sample is consistent with cool position, and by transmission mechanism vertical movement up and down, sample heats and the refrigerative automatization is finished thereby reach.Automatic control when employing is established, thermocouple measurement and controlled temperature, sample carries out cold cycling 25 ℃ of water temperatures to heating between 300 ℃, adopt counter to count automatically.
By Fig. 2, Fig. 3 as seen, the heat fatigue cracking that adds Mn 0.4% is short and thin, and by table 1 as seen, when adding Mn0.4%, the expansion of alloy heat fatigue cracking reaches 18.55mm during cold cycling 5000 times.
Embodiment 3
Choosing alloy composition is (massfraction): Cu4.5%, Mn0.6%, and all the other are Al.Alloy is melting in crucible electrical resistance furnace, and furnace temperature adopts thermocouple measurement, during melting, puts into aluminium, copper, aluminium manganese master alloy successively in crucible, is heated to fusing, and the degasification refining is skimmed after about 5 minutes, and the thermal fatigue sample is produced in cast behind the air cooling then.The thermal fatigue size of sample is 40 * 10 * 5mm, is the notched specimen that precrack is arranged, the long 3mm of breach, and specimen shape and size are as shown in Figure 1.Before the test, grind off specimen surface machining marks and polishing, to eliminate of the influence of specimen surface factor to test-results with sand paper.
Adopt the resistance furnace heating to carry out thermal fatigue test from retraining thermal fatigue tester, plate tensile sample is installed on four sides of cube jig, the heating that guarantees every sample is consistent with cool position, and by transmission mechanism vertical movement up and down, sample heats and the refrigerative automatization is finished thereby reach.Automatic control when employing is established, thermocouple measurement and controlled temperature, sample carries out cold cycling 25 ℃ of water temperatures to heating between 300 ℃, adopt counter to count automatically.
By Fig. 2, Fig. 3 as seen, the heat fatigue cracking that adds Mn 0.6% is long and thick, and by table 1 as seen, when adding Mn 0.6%, the expansion of alloy heat fatigue cracking reaches 24.68mm during cold cycling 5000 times.
Table 3-1 heat fatigue cracking growth data (mm)
Claims (3)
1. one kind adds the method that manganese improves the aluminum-copper alloy thermal fatigue property, and it is characterized in that: choosing alloy composition is (massfraction): Cu4.5%, Mn0.1-0.6%, and all the other are Al; Alloy is melting in crucible electrical resistance furnace, and furnace temperature adopts thermocouple measurement, during melting, puts into aluminium, copper, aluminium manganese master alloy successively in crucible, is heated to fusing, and the degasification refining is skimmed after about 5 minutes, and the thermal fatigue sample is produced in cast behind the air cooling then; The thermal fatigue size of sample is 40 * 10 * 5mm, is the notched specimen that precrack is arranged, the long 3mm of breach; Before the test, grind off specimen surface machining marks and polishing, to eliminate of the influence of specimen surface factor to test-results with sand paper.
2. a kind of method that manganese improves the aluminum-copper alloy thermal fatigue property that adds according to claim 1, adopt the resistance furnace heating to carry out thermal fatigue test from retraining thermal fatigue tester, plate tensile sample is installed on four sides of cube jig, the heating that guarantees every sample is consistent with cool position, by transmission mechanism vertical movement up and down, sample heats and the refrigerative automatization is finished thereby reach; Automatic control when employing is established, thermocouple measurement and controlled temperature, sample carries out cold cycling 25 ℃ of water temperatures to heating between 300 ℃, adopt counter to count automatically; When the cold cycling number of times reached 5000 times, the crackle of more every kind of tissue found to add the longest and the thickest of Mn0.1%, Mn0.6%, adds the shortest and the thinnest of Mn0.4%.
3. a kind of method that manganese improves the aluminum-copper alloy thermal fatigue property that adds according to claim 2, the add-on of manganese can be preferably 0.4%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104372187A (en) * | 2013-08-16 | 2015-02-25 | 镇江忆诺唯记忆合金有限公司 | Method for improving Al-Cu alloy thermal fatigue property by adding Mn |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101205582A (en) * | 2007-11-30 | 2008-06-25 | 胡德云 | Aluminum copper alloy material and casting heat-treatment technique |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101205582A (en) * | 2007-11-30 | 2008-06-25 | 胡德云 | Aluminum copper alloy material and casting heat-treatment technique |
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| Title |
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| 《优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 20051215 李国强 Al-Cu-Mn-Ti-Ce合金热疲劳性能的研究 第17-18，22-24页 1-3 , 2 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104372187A (en) * | 2013-08-16 | 2015-02-25 | 镇江忆诺唯记忆合金有限公司 | Method for improving Al-Cu alloy thermal fatigue property by adding Mn |
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