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Pre-deformation assisted heat treatment and rolling method of a high volume fraction second-phase magnesium alloy

A high volume fraction, magnesium alloy technology, used in heat treatment process control, metal rolling, heat treatment furnaces, etc., can solve problems such as difficulty in plastic forming and forming, and achieve the effect of improving yield

Active Publication Date: 2020-03-17
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of difficult plastic forming, and to provide a high volume fraction second phase magnesium alloy stress-assisted phase diffusion rolling method

Method used

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  • Pre-deformation assisted heat treatment and rolling method of a high volume fraction second-phase magnesium alloy
  • Pre-deformation assisted heat treatment and rolling method of a high volume fraction second-phase magnesium alloy
  • Pre-deformation assisted heat treatment and rolling method of a high volume fraction second-phase magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 Stress-assisted phase diffusion rolling method of high volume fraction second-phase magnesium alloy

[0028] 1) Stress-assisted phase diffusion: put the cast-rolled ATZ421 magnesium alloy billet into the heating box, and then perform one pass of pre-deformation rolling at 250 degrees Celsius for 10 minutes, with a reduction of 8%; then the pre-deformed magnesium The alloy is placed in a heating furnace, heated to 425 degrees Celsius for 150 minutes under the protection of argon, and the second phase is diffused by heat treatment;

[0029] 2) High-temperature rolling: the slab after the heat treatment in step (1) is rolled through more than 8 passes, the reduction of each pass is 10%, and the temperature is kept at 330 degrees Celsius for 15 minutes between each pass, and rolled into a thin plate. The total reduction is greater than 70%;

[0030] 3) Recrystallization treatment: place the rolled sample in a heating furnace, and perform annealing heat treatment ...

Embodiment 2

[0031] Example 2 Stress-assisted phase diffusion rolling method of high volume fraction second-phase magnesium alloy

[0032] 1) Stress-assisted phase diffusion: put the cast-rolled ATZ421 magnesium alloy billet into the heating box, and carry out 2 passes of pre-deformation rolling after holding it for 10 minutes at 280 degrees Celsius, and the reduction in each pass is 10%; then pre-deformed The final magnesium alloy is placed in a heating furnace, heated to 400 degrees Celsius for 180 minutes under the protection of argon, and the second phase is diffused by heat treatment;

[0033] 2) High-temperature rolling: the slab after the heat treatment in step (1) is rolled for more than 5 passes, the reduction of each pass is 15%, and the temperature is kept at 350 degrees Celsius for 10 minutes between each pass, and rolled into a thin plate. The total reduction is greater than 70%;

[0034] 3) Recrystallization treatment: place the rolled sample in a heating furnace, and perfor...

Embodiment 3

[0035] Example 3 Stress-assisted Phase Diffusion Rolling Method of High Volume Fraction Second Phase Magnesium Alloy

[0036] 1) Stress-assisted phase diffusion: put the cast-rolled AZ31 magnesium alloy billet into the heating box, and perform one pass of pre-deformation rolling after 15 minutes at 250 degrees Celsius, and the reduction of each pass is 20%; then the pre-deformation The final magnesium alloy is placed in a heating furnace, heated to 430 degrees Celsius for 100 minutes under the protection of argon, and the second phase is diffused by heat treatment;

[0037] 2) High-temperature rolling: the slab after the heat treatment in step (1) is rolled through more than 7 passes, the reduction of each pass is 12%, and the temperature is kept at 320 degrees Celsius for 20 minutes between each pass, and rolled into a thin plate. The total reduction is greater than 70%;

[0038] 3) Recrystallization treatment: place the rolled sample in a heating furnace, and perform anneal...

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Abstract

The invention discloses a predeformation auxiliary heat treatment and rolling method of high-volume-fraction second-phase magnesium alloy. The predeformation auxiliary heat treatment and rolling method of the high-volume-fraction second-phase magnesium alloy comprises the steps that a magnesium alloy blank is cast and rolled at the temperature of 200-350 DEG C and is maintained at the temperatureof 5-45 minutes, then predeformation rolling is conducted by 1-3 passes, and the rolling reduction of each pass is 3-25%; after predeformation, the magnesium alloy is heated to the temperature of 200-430 DEG C under the protection of inert gas and is maintained at the temperature for 30-300 minutes; the plate blank is rolled by 7 passes and maintained at the temperature of 300-400 DEG C for 5-30 minutes in each pass; the sheet is heated to the temperature of 200-375 DEG C under the protection of inert gas, and annealing heat treatment is conducted for 10-200 minutes, so that a magnesium alloyboard with evenly and dispersely-distributed second phases and fine grain tissue is obtained. By adoption of the predeformation auxiliary heat treatment and rolling method of the high-volume-fractionsecond-phase magnesium alloy, the large-size chain-shaped second-phase morphology of the magnesium alloy is improved, the problem that sufficient solid solution of large segregation phases still cannot be achieved at a high temperature for a long time is solved, and the problems of edge cracks, middle breakage and difficult rolling formation in the rolling process are also solved; and the board tissue is fine and uniform, the second-phase morphology is regular, and high tenacity is achieved in the indoor-temperature drawing process.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a stress-assisted phase diffusion rolling method of a high volume fraction second-phase magnesium alloy. Background technique [0002] As the lightest metal material for engineering structures, magnesium alloy has the advantages of high specific strength, high specific stiffness, strong electromagnetic shielding ability, good damping and shock absorption, good electrical and thermal conductivity, and good recyclability. Lightweight, energy saving, environmental protection and other fields have been increasingly widely used. However, the difficulty of plastic forming has always been one of the most important problems restricting the development of magnesium alloys. In addition to the inherent hexagonal close-packed lattice structure of magnesium alloys, the size and distribution of the second phase are also important factors affecting the plastic forming of magnesium alloys. In re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B3/00C21D9/00C21D11/00
CPCB21B3/00C21D9/0081C21D11/00
Inventor 王慧远张呈呈姜启川王珵查敏杨治政荣建张行徐新宇马趁义
Owner JILIN UNIV
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