CN101117696A - Post-treating method for steel-back aluminium-based semisolid-state clad plate - Google Patents
Post-treating method for steel-back aluminium-based semisolid-state clad plate Download PDFInfo
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- CN101117696A CN101117696A CNA2007101214192A CN200710121419A CN101117696A CN 101117696 A CN101117696 A CN 101117696A CN A2007101214192 A CNA2007101214192 A CN A2007101214192A CN 200710121419 A CN200710121419 A CN 200710121419A CN 101117696 A CN101117696 A CN 101117696A
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Abstract
The present invention discloses a post-processing method for steel-back aluminum-base semisolid composite plates and relates to the post-processing research field of interfacial mechanical characteristic of steel-back aluminum-base semisolid composite plates. At room temperature, a steel-back aluminum-base semisolid composite plate is rolled with the reduction rate of 0.5-1.6 percent on a precision rolling mill, and the difference between shrinkages of the aluminum-base coating and the steel base in the coagulating and cooling process of the composition is redeemed by the difference between the deformation of the aluminum-base coating and the steel base produced in the rolling process, thereby, reducing the additional interfacial stress of the composite plate, simply and conveniently improving the interfacial shear strength of the composite plate, and solving the technical problems of large energy consumption and small increase amplitude of interfacial shear strength in post-processing method of diffusion annealing of aluminum-base semisolid composite plates.
Description
Technical field
The present invention relates to a kind of interface shear strength post-treating method of steel-back aluminium-based semisolid-state clad plate.
Background technology
Steel-back aluminium-based semisolid-state clad plate is to adopt composition board that solid-state steel plate and aluminium-based semisolid-state slurry are composited, that be made of steel backing and aluminium base coating.Because the coefficient of expansion of aluminium base coating is greater than the coefficient of expansion of steel backing, therefore, solidifying in the process of cooling after steel-back aluminium-based semisolid-state is compound, the shrinkage of aluminium base coating is greater than the shrinkage of steel backing, but because the intensity of aluminium base coating is less than the intensity of steel backing, like this, at the compound interface place, steel backing has hindered the normal contraction of aluminium base coating, therefore produces additional stress at the compound interface place.Behind the combined shaping, this is stress-retained at the composition board interface, and it is superimposed with the stress that the subsequent technique process produces, aggravation is to the destruction of compound interface, so behind combined shaping, need composition board is carried out aftertreatment, fully reduce the interface additional stress, the composition board interface shear strength is improved.
Main at present employing diffusion annealing method is carried out aftertreatment to composition board, and the treatment time, annealing temperature was up to more than 300 ℃ usually more than 10 hours.In long high-temperature annealing process, the atom that is in the additional stress district can obtain enough energy, moves to the low energy equilibrium theory of tide by the high energy equilibrium theory of tide, thereby has reduced the interface additional stress, has improved interface shear strength.But for steel-back aluminium-based semisolid-state clad plate, long high temperature diffusion annealing, not only big, the cost raising of energy consumption, and the compound interface place can form the above crisp hard iron aluminum compound thick-layer of 80 μ m, cause the compound interface embrittlement, when reducing the interface additional stress, the interface embrittlement also can make the raising of compound interface shearing resistance be very restricted like this, compound interface shearing resistance increase rate is very little, and its maximum value is confined to 69-71MPa usually.
Summary of the invention
Technical problem to be solved by this invention is, overcome the deficiency of steel-back aluminium-based semisolid-state clad plate diffusion annealing post-treating method " energy consumption big, interface shear strength increase rate little ", provide a kind of and can remedy shrinkage difference that aluminium base coating and steel backing solidifying after semi-solid state is compound produce in the process of cooling and then the post-treating method that reduces the compound interface additional stress, further improve the interface shear strength of steel-back aluminium-based semisolid-state clad plate.
The technical solution adopted for the present invention to solve the technical problems is: at room temperature, on finishing rolling mill, to steel-back aluminium-based semisolid-state clad plate, carrying out draft is the rolling of 0.5-1.6%.
Draft is that the difference of composition board ingoing ga(u)ge and outgoing gauge is again divided by ingoing ga(u)ge.
Because the intensity of aluminium base coating is less than the intensity of steel backing, when rolling processing, the deflection of aluminium base coating is greater than the deflection of steel backing, like this, utilize the difference of aluminium base coating that rolling processing causes and steel backing deflection to remedy the difference of aluminium base coating and steel backing shrinkage in the composite solidification process of cooling, and then reduce composition board interface additional stress, thereby further improve the composition board interface shear strength.
The draft of rolling aftertreatment is most important, if draft is less than 0.5%, the aluminium base coating that then rolling processing produces and the difference of steel backing deflection can not remedy the difference of aluminium base coating and steel backing shrinkage in the composite solidification process of cooling fully, do not reach the purpose that fully reduces composition board interface additional stress; If draft is greater than 1.6%, the aluminium base coating that then rolling processing produces and the difference of steel backing deflection, though remedied the difference of aluminium base coating and steel backing shrinkage in the composite solidification process of cooling, but caused the difference of new aluminium base coating and steel backing deflection, form new additional stress again at the compound interface place, caused the reduction of compound interface shearing resistance.Therefore, the rolling aftertreatment draft scope that can remedy aluminium base coating and steel backing shrinkage difference in the semi-solid state composite solidification process of cooling, effectively improves interface shear strength is 0.5-1.6%.
The present invention compares the beneficial effect that is had with prior art: utilize the present invention, steel-back aluminium-based semisolid-state clad plate is rolled aftertreatment, the compound interface shearing resistance is brought up to 74-80MPa by 70-71MPa, and effect energy-conservation and the raising interface shear strength is very good.The inventive method is simple, convenient.
Embodiment
At room temperature, on finishing rolling mill, to steel-back aluminium-based semisolid-state clad plate, carrying out draft is the rolling processing of 0.5-1.6%.Utilize the difference of aluminium base coating that rolling processing produces and steel backing deflection to remedy the difference of aluminium base coating and steel backing shrinkage in the composite solidification process of cooling, and then reduce composition board interface additional stress, raising composition board interface shear strength.
Embodiment one
To the semisolid-state clad plate that constitutes by the thick 08Al steel plate of 1.2mm, the thick commercial-purity aluminium coating of 2.5mm, at room temperature, on finishing rolling mill, carry out draft and be 1.0% rolling aftertreatment, composition board compound interface shearing resistance is brought up to 80MPa after rolling by the 71MPa before rolling.
Embodiment two
To the semisolid-state clad plate that constitutes by the thick 08Al steel plate of 1.2mm, the thick Al-28Pb coating of 2.5mm, at room temperature, on finishing rolling mill, carry out draft and be 1.6% rolling aftertreatment, composition board compound interface shearing resistance is brought up to 77MPa after rolling by the 70MPa before rolling.
Embodiment three
To the semisolid-state clad plate that constitutes by the thick 08Al steel plate of 1.2mm, the thick Al-20Sn coating of 2.5mm, at room temperature, on finishing rolling mill, carry out draft and be 0.9% rolling aftertreatment, composition board compound interface shearing resistance is brought up to 76MPa after rolling by the 70MPa before rolling.
Embodiment four
To the semisolid-state clad plate that constitutes by the thick 08Al steel plate of 1.2mm, the thick Al-7Gr coating of 2.5mm, at room temperature, on finishing rolling mill, carry out draft and be 0.5% rolling aftertreatment, composition board compound interface shearing resistance is brought up to 74MPa after rolling by the 70MPa before rolling.
Claims (1)
1. the post-treating method of a steel-back aluminium-based semisolid-state clad plate is characterized in that, at room temperature, on finishing rolling mill, to steel-back aluminium-based semisolid-state clad plate, carrying out draft is the rolling aftertreatment of 0.5-1.6%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101214192A CN100535172C (en) | 2007-09-05 | 2007-09-05 | Post-treating method for steel-back aluminium-based semisolid-state clad plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101214192A CN100535172C (en) | 2007-09-05 | 2007-09-05 | Post-treating method for steel-back aluminium-based semisolid-state clad plate |
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| Publication Number | Publication Date |
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| CN101117696A true CN101117696A (en) | 2008-02-06 |
| CN100535172C CN100535172C (en) | 2009-09-02 |
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| CNB2007101214192A Expired - Fee Related CN100535172C (en) | 2007-09-05 | 2007-09-05 | Post-treating method for steel-back aluminium-based semisolid-state clad plate |
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