Efficient rolling technology for continuous columnar crystal structure high-aluminum bronze sheet material

A high-alumina bronze and columnar crystal technology, applied in metal rolling and other directions, can solve the problems of losing the excellent performance of continuous columnar crystal structure, poor cold working performance of high-alumina bronze alloy, and recrystallization, etc., and achieves small deformation resistance and high pass quality Large amount of deformation and the effect of preventing the precipitation of brittle phases

Active Publication Date: 2013-03-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-efficiency rolling process for high-aluminum bronze plates with continuous columnar grain structure, which solves the problem of brittle and difficult-to-process high-aluminum bronze alloys with continuous columnar grain structure, poor cold working performance, easy cracking, and recrystallization during hot working , the problem of losing the unique excellent properties of continuous columnar grain structure

Method used

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  • Efficient rolling technology for continuous columnar crystal structure high-aluminum bronze sheet material
  • Efficient rolling technology for continuous columnar crystal structure high-aluminum bronze sheet material

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Effect test

Embodiment 1

[0017] The Cu-12wt.%Al alloy plate with a width of 25mm, a thickness of 15mm, a bright surface, and a continuous columnar grain structure was prepared by continuous directional solidification; the plate was heated to 850 ° C, kept for 30 minutes, and quickly put into a rolling mill for rolling (The rolling direction is the length direction of the plate, that is, the direction of continuous columnar crystal growth, and the rolling surface is the wide surface of the plate, the same below), and water-cooled rapidly after rolling. After hot rolling, the thickness of the plate is 3mm, and the deformation is 80%. Then carry out 9 passes of warm rolling at a temperature of 400°C, and the reduction of each pass is 5% to 20%. The thickness of the strip after rolling is 0.7mm, and the total processing deformation is 95.3%. The surface of the strip is bright, does not contain brittle precipitates, and has a continuous flaky grain structure.

Embodiment 2

[0019] The Cu-14wt.%Al alloy sheet with a width of 50mm, a thickness of 8mm, a bright surface, and a continuous columnar grain structure was prepared by continuous directional solidification; the sheet was heated to 750°C for 30min and then quickly put into a rolling mill for rolling. Quickly water-cooled after rolling. After hot rolling, the thickness of the strip is 1 mm, and the deformation is 87.5%. Then carry out 7 passes of warm rolling at 375°C, the reduction of each pass is 5% to 20%; the thickness of the strip after rolling is 0.3mm, and the total processing deformation is 96.3%; the surface of the strip is bright and does not contain brittleness. Precipitated phase, with continuous flaky crystal structure.

Embodiment 3

[0021] A Cu-10wt.%Al alloy plate with a width of 100mm, a thickness of 5mm, a bright surface, and a continuous columnar grain structure was prepared by continuous directional solidification; the plate was heated to 800°C for 30min and then quickly put into a two-roll rolling mill for rolling After rolling, it is quickly water-cooled. After hot rolling, the thickness of the strip is 0.5mm, and the deformation is 90%. Then carry out 5 passes of warm rolling at 325°C, the reduction of each pass is 5% to 20%; the strip thickness after rolling is 0.15mm, and the total processing deformation is 97%; the surface of the strip is bright and does not contain brittleness. Precipitated phase, with continuous flaky crystal structure.

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Abstract

An efficient rolling technology for continuous columnar crystal structure high-aluminum bronze sheet material belongs to the technical field of plastic processing of metal materials. The specific technology comprises the steps as follows: firstly, a blank is subjected to single-pass high-temperature rolling at the temperature range of 600 DEG C to 850 DEG C, and the rolling deformation is 60%-90%; water cooling is carried out after rolling; the subsequent warm rolling processing for 3 to 11 passes is carried out at the temperature range of 200 DEG C to 400 DEG C, and the deformation for each pass is controlled to be within 5%-20%. The total amount of finish for the sheet material is more than 95%, and the high-aluminum bronze sheet material does not contain a fragile precipitated phase after formation, is no longer recrystallized and has a continuous sheet-shaped crystal structure. The efficient rolling technology has the advantages that the processing technology with the combination of the single-pass hot rolling and multi-pass warm rolling is adopted, the alloy is no longer recrystallized, and the high-orientation structure is kept; the temperature for the first-pass rolling is high (600 DEG C to 850 DEG C), the pass deformation is large, and the processing efficiency is high; and the high-aluminum bronze sheet material subjected to subsequent warm rolling does not contain the fragile precipitated phase, has the continuous sheet-shaped crystal structure, and also has excellent mechanics, physical and chemical properties.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and relates to a rolling process of high-aluminum bronze plates with continuous columnar grain structure. Background technique [0002] Aluminum bronze is widely used in instrumentation, marine engineering, petrochemical, transportation, aerospace and other fields due to its high strength, high elasticity, high electrical conductivity, and good corrosion resistance and wear resistance. High-alumina bronze with an aluminum content greater than 9.4wt.% has better strength, elasticity and shape memory properties than aluminum bronze with a lower aluminum content, but has poor plasticity and is a typical brittle and difficult-to-machine material. For example, the room temperature plasticity of ordinary cast aluminum bronzes containing 12wt.% of aluminum is only 2~4% [Harry Meigh. Cast and wrought aluminum bronzes: properties, processes and structure. London: IOM Communications Ltd; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22
Inventor 黄海友刘记立谢建新刘雪峰
Owner UNIV OF SCI & TECH BEIJING
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