阅读说明：本技术 一种高强高导铜合金带材的制备加工方法 (Preparation and processing method of high-strength and high-conductivity copper alloy strip ) 是由 刘雪峰 廖万能 杨耀华 于 2019-11-26 设计创作，主要内容包括：本发明公开了一种高强高导铜合金带材的制备加工方法,属于金属材料制备加工技术领域。采用控温铸型连铸技术生产表面质量优异、组织致密、具有沿连铸方向取向度高的柱状晶组织的铜合金带坯,取消均匀化退火和固溶处理工序,直接进行反复单道次大变形量冷轧和时效处理,获得力学性能和导电性能优异的高质量高性能铜合金带材。本发明的优点在于,铜合金带材的制备加工工艺流程短,可促进铜合金带材的析出相细小、弥散和多尺度混合均匀分布且更充分析出,减少合金元素在基体中的固溶,获得具有沿长度方向的连续纤维条带状组织且综合性能优异的铜合金带材。(The invention discloses a preparation and processing method of a high-strength and high-conductivity copper alloy strip, and belongs to the technical field of preparation and processing of metal materials. The method adopts the temperature-controlled casting mold continuous casting technology to produce the copper alloy strip blank with excellent surface quality, compact structure and high columnar crystal structure with high orientation degree along the continuous casting direction, cancels the procedures of homogenization annealing and solution treatment, and directly carries out repeated single-pass large-deformation cold rolling and aging treatment to obtain the high-quality and high-performance copper alloy strip with excellent mechanical property and electrical conductivity. The preparation method has the advantages that the preparation processing process flow of the copper alloy strip is short, the precipitated phases of the copper alloy strip are small, dispersed and uniformly distributed in a multi-scale mixing mode and are more sufficiently precipitated, the solid solution of alloy elements in a matrix is reduced, and the copper alloy strip with the continuous fiber strip-shaped tissues along the length direction and excellent comprehensive performance is obtained.)

1. A preparation and processing method of a high-strength and high-conductivity copper alloy strip is characterized by comprising the following technical scheme:

the method adopts a temperature-controlled casting mold continuous casting technology to produce a copper alloy strip blank with excellent surface quality, compact structure and high columnar crystal structure with high orientation degree along the continuous casting direction, cancels the procedures of homogenization annealing and solution treatment, directly carries out repeated single-pass large-deformation cold rolling and aging treatment, and obtains a high-quality and high-performance copper alloy strip which contains a large amount of fine, dispersed and multi-scale mixed and uniformly distributed precipitated phases, has low solid solubility of alloy elements in a matrix, has a continuous fiber strip-shaped structure along the length direction and has excellent mechanical property and electrical conductivity.

2. The production processing method according to claim 1, wherein the copper alloy is any one of a Cu-Fe-P alloy, a Cu-Ni-Si alloy, or a Cu-Cr-Zr alloy.

3. The manufacturing method according to claim 1, wherein the temperature-controlled mold continuous casting technique is any one of a hot mold continuous casting technique, a two-phase zone continuous casting technique, a warm mold continuous casting technique, or a gradient temperature mold continuous casting technique, and the structure is any one of a down-draw type, an up-draw type, a horizontal type, or an arc type.

4. The manufacturing method according to claim 1, wherein the process of repeating the single-pass high-deformation cold rolling and aging treatment is one-time cold rolling, one-time aging, two-time cold rolling, and two-time aging.

5. The manufacturing method according to claim 1, wherein the process of repeating the single-pass large-deformation cold rolling and aging treatment is one-time cold rolling, one-time aging, two-time cold rolling, two-time aging, three-time cold rolling, and three-time aging.

6. The manufacturing process of claim 1, wherein the process of repeating single-pass high-deformation cold rolling and aging treatment is one-pass cold rolling, one-pass aging, two-pass cold rolling, two-pass aging, three-pass cold rolling, three-pass aging, four-pass cold rolling, and four-pass aging.

7. The manufacturing process of claim 1, wherein the process of repeating single-pass high-deformation cold rolling and aging treatment is one cold rolling-one aging-two cold rolling-two aging-three cold rolling-three aging-four cold rolling-four aging-five cold rolling-five aging.

8. The production processing method according to any one of claims 4 to 7, wherein the pass deformation amount of the first cold rolling is 90% to 99%, and the pass deformation amount of the second cold rolling, the third cold rolling, the fourth cold rolling, or the fifth cold rolling is 60% to 90%.

9. The production method according to any one of claims 4 to 7, wherein the primary aging temperature is 400 to 450 ℃ and the aging time is 30 to 120min, and the secondary aging, the tertiary aging, the quartic aging, or the quintic aging temperature is 350 to 450 ℃ and the aging time is 1 to 60 min.

10. The production process according to any one of claims 4 to 7, wherein the aging treatment is performed in a nitrogen or inert gas atmosphere.

Technical Field

The invention belongs to the technical field of metal material preparation and processing, and particularly relates to a preparation and processing method of a high-strength and high-conductivity copper alloy strip.

Background

With the rapid development in the fields of electronic information technology and the like, the development of conductive parts is being promoted to low cost, high performance and high reliability, which puts higher requirements on copper alloy strips (such as Cu-Fe-P, Cu-Ni-Si and Cu-Cr-Zr) for conductive parts (such as lead frames or connectors and the like), and not only is the copper alloy strip expected to be shorter in preparation and processing process flow, but also the copper alloy strip is required to have higher strength and conductivity.

At present, the traditional preparation and processing technologies of copper alloy strips mainly comprise three types: the method comprises the processes of cold type semi-continuous casting blank, homogenizing annealing, hot rolling, solid solution, face milling, cold rolling, aging, cold rolling and aging; the second is a process of 'cold type up-drawing continuous casting rod blank-surface milling-homogenizing annealing-continuous extrusion-solid solution-cold rolling-aging', and the third is a process of 'cold type continuous casting strip blank-solid solution-surface milling-cold rolling-aging'. The alloy casting blank prepared by the process is of an isometric crystal structure, has more crystal boundaries (particularly transverse crystal boundaries), and has adverse effects on the plasticity and the conductivity of the alloy. In addition, the processes need to carry out homogenization annealing or solution treatment before cold rolling-aging treatment, on one hand, in order to eliminate dendrite segregation in the casting blank and homogenize the components; on the other hand, hard precipitated phases generated in the casting solidification process are dissolved back into the matrix, the plastic deformation capacity of the casting blank is improved, the problems of large residual stress or strip cracking and the like generated in the subsequent hot rolling or cold rolling process are avoided, and preparation is made for subsequent aging precipitation. However, the cast slab prepared by the above process still has the following problems when being subjected to the homogenization annealing or the solution treatment: (1) the discontinuous coarse precipitated phases formed in the solidification process of the casting blank during cold-type casting are more (such as Fe in Cu-Fe-P alloy)₃Ni in P-phase, Cu-Ni-Si alloy₃Cu in Si phase or Cu-Cr-Zr alloy₅Zr phase), the traditional homogenizing annealing or solution treatment process is difficult to completely dissolve the Zr phase back into the matrix, and the over-burning phenomenon of the alloy can be caused by the over-high solution treatment temperature and the over-long solution treatment time; (2) the casting blank prepared by the traditional cold continuous casting passes through a solid solution partAfter treatment, the tissue nonuniformity is difficult to eliminate, the work hardening rate is still large, the cold rolling single-pass deformation is still small (generally the single-pass deformation does not exceed 50%), and the times of processing passes and intermediate annealing are still large, so that the production cost is high and the process flow is long; (3) the precipitation behavior of the casting blank of the cold type casting is regulated and controlled through the cold rolling deformation with small single-pass deformation amount and subsequent aging after the solution treatment, the precipitation nucleation driving force is rapidly reduced in the aging process, the problems that the precipitation is insufficient, the precipitated phase is easy to grow, the discontinuous precipitated phase of a grain boundary is increased, the pinning effect of the single-size precipitated phase relative to dislocation is still weak and the like are easily caused, in addition, the solution treatment can lead the precipitated alloy elements to be dissolved again too much to enter the matrix, so that the matrix lattice is greatly distorted, and the adverse effects on the strength and the conductivity of the alloy strip are generated. The above problems existing in the conventional preparation and processing technology become bottleneck problems restricting the production of high-strength and high-conductivity copper alloy strips, and need to be improved urgently.

In summary, aiming at the problems of excessive solid solution of alloy elements in a matrix, high work hardening rate, insufficient aging precipitation, single precipitated phase size, insufficient dispersion distribution, poor precipitated phase distribution uniformity, easy growth, long process flow, low comprehensive performance and the like existing in the existing production process of the copper alloy strip, the development of a preparation and processing method of the high-strength high-conductivity copper alloy strip, which can promote the precipitated phases to be fine and to be dispersed and uniformly distributed in multiple scales and to be more sufficiently precipitated, has low solid solubility of the alloy elements in the matrix, has a strong oriented structure along the length direction, short process flow and excellent comprehensive performance of the product, is urgently needed.

Disclosure of Invention

The invention aims to provide a preparation and processing method of a high-strength and high-conductivity copper alloy strip, aiming at the problems that the existing production method of the copper alloy strip has excessive solid solution of alloy elements in a matrix, high work hardening rate, insufficient aging precipitation, single precipitated phase size, insufficient dispersion distribution, uneven and easily grown precipitated phase distribution, long process flow, difficult satisfaction of continuously improved comprehensive performance of products and the like.

According to the preparation and processing method of the high-strength and high-conductivity copper alloy strip, the technical scheme is as follows:

the method adopts a temperature-controlled casting mold continuous casting technology different from the traditional cold mold casting to produce the copper alloy strip blank with excellent surface quality, compact structure and high columnar crystal structure along the continuous casting direction, cancels the traditional homogenization annealing and solution treatment process, and directly carries out repeated single-pass large-deformation cold rolling and aging treatment. The repeated single-pass large-deformation cold rolling and aging treatment means that the copper alloy is subjected to single-pass large-deformation cold rolling (the pass deformation of one cold rolling is not less than 90 percent, and the pass deformation of other cold rolling is not less than 60 percent), then is subjected to aging treatment, and is continuously and circularly subjected for multiple times (2-5 times), namely single-pass large-deformation cold rolling-aging- … …. By adopting the repeated single-pass large-deformation cold rolling and aging treatment process, precipitated phases precipitated in an as-cast state and an aging state can be greatly crushed, a larger aging precipitation nucleation driving force can be obtained, and new precipitated phases can be further precipitated in a large amount, so that the problems that the precipitation nucleation driving force is weaker when single-pass small-deformation cold rolling is developed or aging treatment is carried out after multiple times of single-pass small-deformation cold rolling is continuously developed in the traditional process are solved; meanwhile, the solid solution treatment is not carried out before each aging treatment, so that the problem that precipitated phases are dissolved into the matrix again is avoided, the problems that the precipitated phases are reduced, alloy elements are excessively dissolved into the matrix and the like can be solved, the precipitated phases which are large in quantity, fine, dispersed and uniformly distributed in a multi-scale mixing mode can be fully precipitated in the preparation and processing process of the copper alloy strip, the solid solubility of the alloy elements in the matrix is low, and the copper alloy strip has a continuous fiber strip-shaped structure along the length direction, and finally the high-quality and high-performance copper alloy strip with excellent mechanical properties and conductivity is obtained.

Further, the copper alloy is any one of a Cu-Fe-P alloy, a Cu-Ni-Si alloy, or a Cu-Cr-Zr alloy.

Further, the temperature-controlled continuous casting technology is any one of a hot continuous casting technology, a two-phase zone continuous casting technology, a warm continuous casting technology or a gradient temperature continuous casting technology, and the structure of the temperature-controlled continuous casting technology is any one of a down-drawing type, an up-drawing type, a horizontal type or an arc type.

Further, the process of repeated single-pass large-deformation cold rolling and aging treatment comprises primary cold rolling, primary aging, secondary cold rolling and secondary aging.

Further, the process of repeated single-pass large-deformation cold rolling and aging treatment comprises the steps of primary cold rolling, primary aging, secondary cold rolling, secondary aging, tertiary cold rolling and tertiary aging.

Further, the process of the repeated single-pass large-deformation cold rolling and aging treatment comprises the steps of primary cold rolling, primary aging, secondary cold rolling, secondary aging, tertiary cold rolling, tertiary aging, quartic cold rolling and quartic aging.

Further, the process of the repeated single-pass large-deformation cold rolling and aging treatment comprises the steps of primary cold rolling, primary aging, secondary cold rolling, secondary aging, tertiary cold rolling, tertiary aging, quartic cold rolling, quartic aging, quintic cold rolling and quintic aging.

Furthermore, the pass deformation of the primary cold rolling is 90-99%, and the pass deformation of the secondary cold rolling, the tertiary cold rolling, the quartic cold rolling or the quintic cold rolling is 60-90%.

Further, the aging temperature of the primary aging is 400-450 ℃, the aging time is 30-120 min, the aging temperature of the secondary aging, the tertiary aging, the quaternary aging or the quintic aging is 350-450 ℃, and the aging time is 1-60 min.

Further, the aging treatment is carried out in a nitrogen or inert gas atmosphere.

The main advantages of the invention are:

1. compared with the traditional process, the preparation and processing process of the copper alloy strip combining the temperature-controlled casting mold continuous casting, the repeated single-pass large-deformation cold rolling and the aging treatment cancels the procedures of homogenizing annealing, hot rolling, solid solution, surface milling and the like, can greatly improve the utilization rate and yield of the copper alloy material, reduces the energy consumption and shortens the process flow.

2. By adopting the copper alloy strip preparation and processing technology combining the temperature-control casting mold continuous casting, the repeated single-pass large-deformation cold rolling and the aging treatment, after the copper alloy strip is subjected to the multiple single-pass large-deformation cold rolling and the aging treatment, on one hand, precipitated phases precipitated in an as-cast state and an aging state can be greatly crushed under the single-pass large-deformation of one-time cold rolling and other multiple cold rolling, and on the other hand, a larger precipitated nucleation driving force can be further provided to promote the precipitation of new precipitated phases, so that the precipitated phases are subjected to the repeated crushing and continuous precipitation processes, and finally, a large number of fine, dispersed and multi-scale uniformly-mixed precipitated phases can be fully analyzed; on the other hand, the solid solution treatment is not carried out before each aging treatment, so that the precipitated phase is prevented from being dissolved into the matrix again, the problems of reduced precipitated phase, excessive alloy elements which are dissolved into the matrix in a solid solution mode and the like can be solved, and the mechanical property and the conductivity of the copper alloy strip can be obviously improved.

3. By adopting the copper alloy strip preparation and processing technology combining the temperature control casting continuous casting, the repeated single-pass large-deformation cold rolling and the aging treatment, the traditional procedures of homogenizing annealing, hot rolling, solid solution and the like are cancelled, the recrystallization is avoided, the continuously cast copper alloy strip blank has excellent surface quality, compact internal structure and columnar crystal structure with high orientation degree along the continuous casting direction, the repeated single-pass large-deformation cold rolling and the aging treatment can be directly carried out, and finally, the continuous fiber strip-shaped microstructure with high orientation degree along the length direction is obtained in the copper alloy strip, so that the mechanical property and the conductivity of the copper alloy strip are further improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 shows a flow chart of a preparation processing method of the high-strength high-conductivity copper alloy strip according to the invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The present invention is described in detail below with reference to examples, it should be noted that the following examples are only for illustrating the present invention, and the scope of the present invention is not limited by these examples, and those skilled in the art can make some insubstantial modifications and adjustments based on the above disclosure.

The invention provides a preparation and processing method of a high-strength and high-conductivity copper alloy strip, which comprises the following technical scheme:

the method adopts a temperature-controlled casting mold continuous casting technology different from the traditional cold mold casting to produce the copper alloy strip blank with excellent surface quality, compact structure and high columnar crystal structure along the continuous casting direction, cancels the traditional homogenization annealing and solution treatment process, and directly carries out repeated single-pass large-deformation cold rolling and aging treatment. The repeated single-pass large-deformation cold rolling and aging treatment means that the copper alloy is subjected to single-pass large-deformation cold rolling (the pass deformation of one cold rolling is not less than 90 percent, and the pass deformation of other cold rolling is not less than 60 percent), then is subjected to aging treatment, and is continuously and circularly performed for multiple times (2-5 times), namely single-pass large-deformation cold rolling-aging- … … (shown in figure 1). By adopting the repeated single-pass large-deformation cold rolling and aging treatment process, precipitated phases precipitated in an as-cast state and an aging state can be greatly crushed, a larger aging precipitation nucleation driving force can be obtained, and new precipitated phases can be further precipitated in a large amount, so that the problems that the precipitation nucleation driving force is weaker when single-pass small-deformation cold rolling is developed or aging treatment is carried out after multiple times of single-pass small-deformation cold rolling is continuously developed in the traditional process are solved; meanwhile, the solid solution treatment is not carried out before each aging treatment, so that the problem that precipitated phases are dissolved into the matrix again is avoided, the problems that the precipitated phases are reduced, alloy elements are excessively dissolved into the matrix and the like can be solved, the precipitated phases which are large in quantity, fine, dispersed and uniformly distributed in a multi-scale mixing mode can be fully precipitated in the preparation and processing process of the copper alloy strip, the solid solubility of the alloy elements in the matrix is low, and the copper alloy strip has a continuous fiber strip-shaped structure along the length direction, and finally the high-quality and high-performance copper alloy strip with excellent mechanical properties and conductivity is obtained.