CN1974833A - Magnesium alloy heat treatment process with combined current treatment - Google Patents
Magnesium alloy heat treatment process with combined current treatment Download PDFInfo
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- CN1974833A CN1974833A CN 200610125518 CN200610125518A CN1974833A CN 1974833 A CN1974833 A CN 1974833A CN 200610125518 CN200610125518 CN 200610125518 CN 200610125518 A CN200610125518 A CN 200610125518A CN 1974833 A CN1974833 A CN 1974833A
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Abstract
The present invention is magnesium alloy heat treatment process combined with current treatment. The magnesium alloy heat treatment process features its combination with current treatment in one of following four modes: 1. solution quenching with current applied in the current density of 2-20 A/sq cm and no ageing after solution quenching; 2. solution quenching with current applied in the current density of 2-20 A/sq cm and ageing after solution quenching; 3. solution quenching and ageing after solution quenching with current applied in the current density of 2-100 A/sq cm; and 4. solution quenching with current applied in the current density of 2-20 A/sq cm and ageing after solution quenching with current applied in the current density of 2-100 A/sq cm. The magnesium alloy heat treatment process has shortened period, raised production efficiency, reduced oxidation and raised magnesium alloy performance.
Description
Technical field
The present invention relates to a kind of magnesium alloy heat treatment process, belong to magnesium alloy thermal treatment field.
Background technology
Traditional solution strengthening and the process of Ageing Treatment can be improved the performance of casting alloy.If magnesium alloy does not carry out timeliness through after the solution hardening, can improve simultaneously its tensile strength and percentage elongation.But because the diffusion of the atom of alloying element is slower in the magnesium alloy, thereby need long heat time heating time to guarantee that hardening constituent fully dissolves.If magnesium alloy then carries out artificial aging after solution treatment, although can reduce its part plasticity, can improve its yield strength, but heat time heating time, length was the problem that this process exists equally.When using these technologies in actual production, production efficiency will inevitably be subjected to the influence of these factors.
Summary of the invention
The object of the present invention is to provide a kind of magnesium alloy heat treatment process in conjunction with current processing, this method can shorten solution strengthening or artificially aged time, enhances productivity, and reduces magnesium alloy because of being in the high temperature amount of oxidation in following time for a long time; Improve the performance of magnesium alloy.
To achieve these goals, technical scheme of the present invention is: a kind of magnesium alloy heat treatment process in conjunction with current processing is characterized in that: in traditional magnesium alloy heat treatment process, adopt one of following four kinds of methods that magnesium alloy is applied electric current:
1) do not carry out timeliness after the solution hardening, apply electric current in the solid solution process, the current density of employing is 2～20A/cm
2
2) carry out timeliness after the solution hardening, apply electric current in the solid solution process, the current density of employing is 2～20A/cm
2
3) carry out timeliness after the solution hardening, apply electric current in the ag(e)ing process, the current density of employing is 2～100A/cm
2
4) carry out timeliness after the solution hardening, all apply electric current in solid solution process and the ag(e)ing process, the current density change scope that adopts in the solid solution process is 2～20A/cm
2, the current density change scope that adopts in the ag(e)ing process is 2～100A/cm
2
Described magnesium alloy is made pole, and the pole two ends adopt conduction, sludge proof anchor clamps to insert two electrodes of adjustable current source.
Cover troilite on the described magnesium alloy.
The principle of work of this magnesium alloy heat treatment process in conjunction with current processing is: magnesium alloy is in solution strengthening or artificial aging process, and magnesium alloy is near a certain temperature of heat treating regime regulation, at this moment allows 2～20A/cm
2(apply 2～100A/cm in the ag(e)ing process
2) galvanic current pass through magnesium alloy; The specific conductivity difference of different phases in the magnesium alloy in addition, exists the microcell that contains segregation in various degree in the magnesium alloy, their conductive capability also is different; Like this, when electric current is flowed through magnesium alloy, to produce different heat effect at different microcells, because of size of current suitable, the temperature of magnesium alloy integral body still is near the original set(ting)value, the heat that produces only produces small disturbance to the temperature of microcell, the separating out of strengthening phase when the diffusion of alloying element or artificial aging when helping solution strengthening.Thereby compare with traditional handicraft, method of the present invention can shorten the used time of heating, enhances productivity, and reduces the amount of oxidation of magnesium alloy when locating for a long time at high temperature.Simultaneously, under the effect in outfield, change has also taken place in the distribution of phase and microstructure in the magnesium alloy, and is more excellent when the Performance Ratio of magnesium alloy uses traditional handicraft.
In the inventive method implementation process, under the condition that does not make the magnesium alloy burning, electric current can be regulated in the larger context.Because the magnesium alloy overall resistivity is very little, the electrical power that consumes during energising is little, selects low pressure, big electric current, low power adjustable current source to get final product, and equipment investment is little like this, has saved again the energy.The big I of electrical current can accomplish like this to take into account simultaneously efficient and require and two aspects of quality requirement according to the requirement of material property and heat time heating time is rationally regulated.
Description of drawings
Device schematic diagram when Fig. 1 implements for the inventive method.
Among the figure: 1-crucible electrical resistance furnace, 2-refractory brick, 3-magnesium alloy, 4-adjustable current source.
Embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.
Be example so that magnesium alloy AZ91D is heat-treated: with no nickel steel crucible preparation AZ91D alloy, its alloying constituent mass percent is: Al (8.90); Zn (0.637); Mn (0.2085); Be (0.0010); Si (0.022); Fe (0.0024); Cu (0.0014); Ni (0.0008); Mg (all the other).Pour into a mould with the spheroidal graphite cast iron metal mold, make the pole of some φ 10mm * 120mm.Because the cross section of pole is consistent, so guaranteed the uniformity of current density on macroscopic view on the cross section.Device when the inventive method is implemented as shown in Figure 1, the pole two ends adopt the good sludge proof anchor clamps of conductivity to insert two electrodes of adjustable current source 4, pole (magnesium alloy 3) is inserted on the refractory brick 2 that is positioned at crucible electrical resistance furnace 1, during galvanization, guarantee carrying out smoothly of whole heat treatment process.This heat treating regime (adopts 420 ℃ * 16h based on traditional heat treating regime T6 in the solid solution process, ag(e)ing process adopt 200 ℃ * 8h), adopt one of four kinds of different concrete technologies during galvanization, technology and result that it is corresponding are as follows: one, do not carry out timeliness after the solution hardening, apply electric current in the solid solution process, the current density change scope of employing is 2～20A/cm
2(bound of current density with and interval value can both realize the present invention); The traditional technology that does not add electric current is compared, and under the situation that shortens 3～8h heat-up time, the strength of alloy after the processing improves 3.5～18.9%, and extensibility improves 5.3～21%, and the oxidation consumption amount reduces 18.5～41.2%.Two, carry out timeliness after the solution hardening, apply electric current in the solid solution process, the current density change scope of employing is 2～20A/cm
2(bound of current density with and interval value can both realize the present invention); The traditional technology that does not add electric current is compared, and under the situation that shortens solid solution 3～8h heat-up time, the strength of alloy after the processing improves 8.9～23%, and extensibility improves 9.3～31.2%, and the oxidation consumption amount reduces 10.3～32.6%.Three, carry out timeliness after the solution hardening, apply electric current in the ag(e)ing process, the current density change scope of employing is 2～100A/cm
2(bound of current density with and interval value can both realize the present invention); The traditional technology that does not add electric current is compared, and under the situation that shortens timeliness 1～3.5h heat-up time, the strength of alloy after the processing improves 5.1～12.3%, and extensibility improves 6.4～15.6%, and the oxidation consumption amount reduces 5.2～11.2%.Four, carry out timeliness after the solution hardening, all apply electric current in solid solution process and the ag(e)ing process, the current density change scope that adopts in the solid solution process is 2～20A/cm
2(bound of current density with and interval value can both realize the present invention), the current density change scope that adopts in the ag(e)ing process is 2～100A/cm
2(bound of current density with and interval value can both realize the present invention); The traditional technology that does not add electric current is compared, shorten at the same time under the situation of solid solution 2～7h heat-up time and timeliness 1.5～3h heat-up time, strength of alloy after the processing improves 16.4～31.4%, and extensibility improves 14.5～35.2%, and the oxidation consumption amount reduces 7.8～17.5%.
In the process that magnesium alloy is processed, should take suitable anti-oxidation measure, adopt the method that covers troilite (FeS) at magnesium alloy in this experiment.The selection of concrete technology kind, the size of electric current and the selection of heat time heating time should consider according to efficient and two requirements of quality, raising the efficiency can be by suitably strengthening electric current, improve quality and then adopt relatively long energising heat time heating time, the electric current of the appropriate to the occasion employing less of long-time heating affects performance to prevent local generation thermal accumlation.
Claims (3)
1. magnesium alloy heat treatment process in conjunction with current processing is characterized in that: in traditional magnesium alloy heat treatment process, adopt one of following four kinds of methods that magnesium alloy is applied electric current:
1) do not carry out timeliness after the solution hardening, apply electric current in the solid solution process, the current density of employing is 2～20A/cm
2
2) carry out timeliness after the solution hardening, apply electric current in the solid solution process, the current density of employing is 2～20A/cm
2
3) carry out timeliness after the solution hardening, apply electric current in the ag(e)ing process, the current density of employing is 2～100A/cm
2
4) carry out timeliness after the solution hardening, all apply electric current in solid solution process and the ag(e)ing process, the current density change scope that adopts in the solid solution process is 2～20A/cm
2, the current density change scope that adopts in the ag(e)ing process is 2～100A/cm
2
2. a kind of magnesium alloy heat treatment process according to claim 1 in conjunction with current processing, it is characterized in that: described magnesium alloy is made pole, and the pole two ends adopt conduction, sludge proof anchor clamps to insert two electrodes of adjustable current source.
3. a kind of magnesium alloy heat treatment process in conjunction with current processing according to claim 1 is characterized in that: cover sulfurous iron ore on the described magnesium alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101255183A CN100436636C (en) | 2006-12-19 | 2006-12-19 | Magnesium alloy heat treatment process with combined current treatment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101255183A CN100436636C (en) | 2006-12-19 | 2006-12-19 | Magnesium alloy heat treatment process with combined current treatment |
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| CN1974833A true CN1974833A (en) | 2007-06-06 |
| CN100436636C CN100436636C (en) | 2008-11-26 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220528A (en) * | 2011-07-18 | 2011-10-19 | 福州大学 | Protection method for preventing oxidation-combustion in smelting magnesium alloy |
| CN114182185A (en) * | 2021-12-03 | 2022-03-15 | 上海航天精密机械研究所 | Microwave-assisted solution treatment method for magnesium alloy |
| CN114703412A (en) * | 2022-03-29 | 2022-07-05 | 吉林大学 | High-performance microalloyed Mg-Al-Ca-Mn alloy and preparation method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09111438A (en) * | 1995-10-18 | 1997-04-28 | Nisshin Steel Co Ltd | Zinc-magnesium alloy plated steel sheet excellent in corrosion resistance in edge face and its production |
| BR9917098B1 (en) * | 1999-02-12 | 2011-06-28 | treatment process of an aluminum alloy. | |
| CN1227382C (en) * | 2003-07-11 | 2005-11-16 | 武汉理工大学 | High zinc aluminium rare earth magnesium alloy |
-
2006
- 2006-12-19 CN CNB2006101255183A patent/CN100436636C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220528A (en) * | 2011-07-18 | 2011-10-19 | 福州大学 | Protection method for preventing oxidation-combustion in smelting magnesium alloy |
| CN114182185A (en) * | 2021-12-03 | 2022-03-15 | 上海航天精密机械研究所 | Microwave-assisted solution treatment method for magnesium alloy |
| CN114703412A (en) * | 2022-03-29 | 2022-07-05 | 吉林大学 | High-performance microalloyed Mg-Al-Ca-Mn alloy and preparation method thereof |
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| Publication number | Publication date |
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| CN100436636C (en) | 2008-11-26 |
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