A Processing Technology for Suppressing Coarse Grain in Weld of Magnesium Alloy Profiles

A processing technology and magnesium alloy technology, which is applied in the field of weld coarse grain control in the extrusion and heat treatment of magnesium alloy profiles, can solve the problem of less research on weld coarse grains, the effect of coarse grains is not obvious, and the coarse grains of magnesium alloy profiles The organization is difficult to realize and other problems, so as to improve the effect of aging treatment, avoid the generation of coarse grain of weld seam, and shorten the effect of aging time

Active Publication Date: 2022-06-21
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as a metal with low stacking fault energy, magnesium alloy has completely different physical and chemical properties from aluminum alloy, and it is extremely prone to complete recrystallization.
Therefore, it is difficult to control the recrystallization of magnesium alloys by adding alloying elements to eliminate the coarse-grained structure of magnesium alloy profiles.
Secondly, the production of coarse grains during extrusion can be suppressed through process adjustment, but the effect on the production of coarse grains during heat treatment is not obvious
In addition, most of the current research is carried out on surface coarse grains, and there are few studies on weld coarse grains.

Method used

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  • A Processing Technology for Suppressing Coarse Grain in Weld of Magnesium Alloy Profiles
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  • A Processing Technology for Suppressing Coarse Grain in Weld of Magnesium Alloy Profiles

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Embodiment 1

[0045] A processing technology for suppressing coarse grains of magnesium alloy profile welds, the specific steps are as follows:

[0046] (1) Prepare an ordinary commercial ZK60 magnesium alloy ingot with a size of Ф120×400mm.

[0047] (2) The magnesium alloy ingot is subjected to homogenization treatment, the temperature of the homogenization treatment is 410°C, and the holding time is 24h.

[0048] (3) peeling the magnesium alloy ingot obtained in step (2). When peeling, the surface processing amount is 1mm, and the surface roughness Ra≤23μm.

[0049] (4) extruding the magnesium alloy ingot obtained in step (3) to obtain a magnesium alloy extrusion profile, the temperature of the cast rod is 350°C, the temperature of the die is 380°C, the temperature of the extrusion cylinder is 360°C, and the extrusion speed is 5mm / s. In addition, liquid nitrogen was used to cool the extrusion die during extrusion, and the outlet pressure of the liquid nitrogen was 0.5 MPa.

[0050] (...

Embodiment 2

[0056] A processing technology for suppressing coarse grains of magnesium alloy profile welds, the specific steps are as follows:

[0057] (1) Prepare an ordinary commercial ZK60 magnesium alloy ingot with a size of Ф120×400mm.

[0058] (2) The magnesium alloy ingot is subjected to homogenization treatment, the temperature of the homogenization treatment is 380°C, and the holding time is 24h.

[0059] (3) peeling the magnesium alloy ingot obtained in step (2). When peeling, the surface processing amount is 6mm, and the surface roughness Ra≤23μm.

[0060] (4) extruding the magnesium alloy ingot obtained in step (3) to obtain a magnesium alloy extrusion profile, the temperature of the cast rod is 250°C, the temperature of the die is 280°C, the temperature of the extrusion cylinder is 260°C, and the extrusion speed is 0.5 mm / s. In addition, liquid nitrogen was used to cool the extrusion die during extrusion, and the outlet pressure of the liquid nitrogen was 0.6 MPa.

[0061]...

Embodiment 3

[0067] A processing technology for suppressing coarse grains of magnesium alloy profile welds, the specific steps are as follows:

[0068] (1) Prepare an ordinary commercial ZK60 magnesium alloy ingot with a size of Ф120×400mm.

[0069] (2) The magnesium alloy ingot is subjected to homogenization treatment, the temperature of the homogenization treatment is 400° C., and the holding time is 20h.

[0070] (3) peeling the magnesium alloy ingot obtained in step (2). When peeling, the surface processing amount is 4mm, and the surface roughness Ra≤23μm.

[0071] (4) subjecting the magnesium alloy ingot obtained in step (3) to extrusion treatment to obtain a magnesium alloy extrusion profile, the temperature of the casting rod is 300°C, the temperature of the die is 320°C, the temperature of the extrusion cylinder is 300°C, and the extrusion speed is 2mm / s. In addition, liquid nitrogen was used to cool the extrusion die during extrusion, and the outlet pressure of the liquid nitr...

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Abstract

A processing technology for suppressing the coarse grain of the weld seam of a magnesium alloy profile, comprising the following steps: preparing a magnesium alloy ingot, homogenizing treatment, peeling treatment, extrusion treatment, pre-stretching at room temperature, solution treatment, quenching treatment, drawing Stretch correction, artificial aging treatment, etc. This processing technology can effectively control the generation of coarse grains in the weld seam during the extrusion and heat treatment of magnesium alloy profiles, and the performance indicators of the final product are higher than the standard requirements.

Description

technical field [0001] The invention belongs to the field of magnesium alloy processing and heat treatment, and particularly relates to a method for controlling coarse grains of welds in the process of extrusion and heat treatment of magnesium alloy profiles. Background technique [0002] Magnesium alloy, as the lightest structural metal material in current engineering applications, has the advantages of high specific strength and specific stiffness, excellent thermal conductivity, damping and shock absorption, electromagnetic shielding, and machinability. Today, with increasing emphasis on sustainable development, magnesium alloys are gradually becoming the most promising lightweight structural materials in the fields of aerospace, defense, and rail transit. However, the magnesium alloy has a close-packed hexagonal structure, and its plastic working ability is poor, which increases the difficulty of forming magnesium alloy components. In addition, the low absolute strength...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06
CPCC22F1/06C22F1/002C22F1/053
Inventor 陈良唐建伟赵国群张存生孙璐
Owner SHANDONG UNIV
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