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Heat treatment process for processing high temperature-resistant braze welding aluminum/steel composite belt

A composite belt and high temperature resistant technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of limited window range, limited product performance stability, etc., and achieve the effect of high tensile strength

Active Publication Date: 2014-07-16
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The available heat treatment process window range of traditional high-purity aluminum / steel and aluminum-silicon / steel is limited, which limits the performance stability of the product

Method used

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  • Heat treatment process for processing high temperature-resistant braze welding aluminum/steel composite belt
  • Heat treatment process for processing high temperature-resistant braze welding aluminum/steel composite belt

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] Example 1: The steel side of the aluminum / steel composite strip is annealed at different temperatures and for different times, and the time for completing recrystallization at each temperature can be obtained from the microhardness diagram. The test temperature is 475, 500, 505, 510, 515, 517, 520, 525, 530, 535°C. The results showed that: after annealing at 475°C for 60 hours, the steel structure did not recrystallize; at 500°C for 51 hours, the steel structure recrystallized; at 505°C for 42 hours, the steel structure recrystallized; at 510°C for 33 hours, the steel structure recrystallized. The crystallization is completed; the recrystallization completion time at 515°C is 16h; the recrystallization completion time at 520°C is 12h; the recrystallization completion time of 525°C annealed steel structure is 8h; the recrystallization completion time at 530°C is 6h; The completion time is 4h, the microhardness of annealing is detailed in figure 1 .

example 2

[0017] Example 2: After the recrystallization annealing treatment of the two-component aluminum / steel composite strip, the simulated brazing treatment is carried out, wherein the simulated brazing heat treatment system is specifically: the aluminum / steel strip after the recrystallization annealing treatment is placed within 30 minutes at room temperature Rise to 625°C, keep at 625°C for 10 minutes and then air cool.

[0018] Observing the interface conditions of the aluminum / steel composite strips with two components, the same situation was obtained: 33-100h heat treatment + simulated brazing treatment at 510°C, no intermetallic compounds appeared at the interface; 16-100h heat treatment + simulated brazing treatment at 515°C , no intermetallic compound appeared on the interface; 12-72h heat treatment + simulated brazing treatment at 520°C, no intermetallic compound appeared on the interface; 12-72h heat treatment + simulated brazing treatment at 520°C, no intermetallic compoun...

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Abstract

The invention relates to a heat treatment process for processing a high temperature-resistant braze welding aluminum / steel composite belt, belonging to the technical field of metal alloys. The heat treatment process is characterized in that the cold rolling deformation amount is 55%+ / -5%, and an aluminum substrate of the aluminum / steel composite belt comprises the following ingredients in percentage by weight: 0.76%-0.78% of Si, 0.055%-0.10% of Er and the balance being aluminum and other inevitable impurity elements; the steel substrate is 08Al steel. According to the heat treatment process, firstly the annealing treatment is carried out on the aluminum / steel composite belt subjected to cold rolling composition at 510-535 DEG C at different times, and then, braze welding simulation heat treatment is carried out to obtain an available annealing temperature time range; in such a way, the prepared aluminum / steel composite belt can not only meet the requirements for mechanical properties needed by the subsequent processing of the aluminum / steel composite belt, but also provide the heat treatment process which effectively solves the problem that the bonding strength of a material is low due to the presence of a friable Fe-Al phase under the condition of high temperature braze welding.

Description

technical field [0001] The invention relates to a heat treatment process that can be used for processing high-temperature brazing aluminum / steel composite strips, and belongs to the technical field of alloy materials. technical background [0002] Aluminum / steel composite strip has the dual advantages of steel and aluminum, and is widely used in various fields of national economy. Steel has high strength and low price, aluminum has corrosion resistance, good heat conduction, and light weight, and the aluminum / steel composite strip material solves the welding problem of dissimilar metals. Aluminum-steel / composite strip combines the excellent properties of the two, and is an advanced structural composite material with special performance. Due to the differences in the physical and chemical properties of aluminum and steel, especially the large difference in melting point and mechanical properties, and the characteristics that various intermetallic compounds can be formed betw...

Claims

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Application Information

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IPC IPC(8): C22F1/043C21D9/52
Inventor 高坤元茹文霞聂祚仁文胜平黄晖
Owner BEIJING UNIV OF TECH
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