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Processing method for improving high temperature creep properties of magnesium alloys by rolling and hammering

A processing method and high temperature creep technology, applied in metal processing equipment, metal rolling, temperature control and other directions, to achieve the effect of low equipment requirements, low cost and simple process method

Active Publication Date: 2022-01-28
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, how to improve the high-temperature creep properties of magnesium alloys through traditional magnesium alloy processing technology has not been reported in the existing literature, and it is also a technical problem that needs to be solved to expand the application range of magnesium alloys.

Method used

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  • Processing method for improving high temperature creep properties of magnesium alloys by rolling and hammering
  • Processing method for improving high temperature creep properties of magnesium alloys by rolling and hammering
  • Processing method for improving high temperature creep properties of magnesium alloys by rolling and hammering

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Experimental program
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Effect test

Embodiment 1

[0033] The magnesium alloy is prepared by water-cooled semi-continuous casting method, and the pure magnesium ingot (Mg 99.9%), pure aluminum ingot (Al 99.9%), pure zinc ingot (Zn 99.9%), Al-Mn master alloy and Mg-Y master alloy are smelted , the as-cast structure of the magnesium alloy is obtained by casting, and the mass percentage composition of the magnesium alloy is: Al: 8.5%, Zn: 0.90%, Mn: 0.3%, Y: 0.5%, and the rest is magnesium and impurity elements that cannot be removed.

[0034] The as-cast structure is subjected to solution treatment at 380°C×12h; then the solid solution structure is cut and rolled. The thickness before rolling is 80mm, the rolling temperature is 300°C, and the rolling speed is 0.2m / s. The number of passes is 8, the total deformation is 80%, and the temperature of the magnesium alloy after rolling is 305°C. The EBSD microstructure of the rolled magnesium alloy is as follows: figure 1 As shown, it can be seen that it has an obvious preferred orien...

Embodiment 2

[0039] The magnesium alloy is prepared by water-cooled semi-continuous casting method, and the pure magnesium ingot (Mg 99.9%), pure aluminum ingot (Al 99.9%), pure zinc ingot (Zn 99.9%), Al-Mn master alloy and Mg-Y master alloy are smelted , the as-cast structure of the magnesium alloy is obtained by pouring, and the mass percentage composition of the magnesium alloy is: Al: 9.5%, Zn: 0.45%, Mn: 0.4%, Y: 0.8%, and the rest is magnesium and impurity elements that cannot be removed.

[0040] The as-cast structure is solution treated at 400°C×8h; then the solid solution structure is cut and rolled. The thickness before rolling is 80mm, the rolling temperature is 350°C, and the rolling speed is 0.4m / s. The number of passes is 5, the total deformation is 70%, and the temperature of the magnesium alloy after rolling is 250°C. The EBSD microstructure of the rolled magnesium alloy is as follows: Figure 6 As shown, it can be seen that it has an obvious preferred orientation, and the...

Embodiment 3

[0043] The magnesium alloy is prepared by water-cooled semi-continuous casting method, and the pure magnesium ingot (Mg 99.9%), pure aluminum ingot (Al 99.9%), pure zinc ingot (Zn 99.9%), Al-Mn master alloy and Mg-Y master alloy are smelted , the as-cast structure of the magnesium alloy is obtained by pouring, and the mass percentage composition of the magnesium alloy is: Al: 0.91%, Zn: 0.61%, Mn: 0.15%, Y: 0.3%, and the rest is magnesium and impurity elements that cannot be removed.

[0044] The as-cast structure is solution treated at 420°C×4h; then the solid solution structure is cut and rolled. The thickness before rolling is 80mm, the rolling temperature is 400°C, and the rolling speed is 0.6m / s. The number of passes is 3, the total deformation is 50%, and the temperature of the magnesium alloy after rolling is 340°C. The EBSD microstructure of the rolled magnesium alloy is as follows: Figure 8 As shown, the rolled microstructure has obvious preferred orientation, and t...

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Abstract

The invention discloses a processing method for improving the high temperature creep performance of magnesium alloy by rolling and hammering. 0.4%, Y: 0.3% to 0.8%; the processing method includes the following steps: 1), performing solid solution treatment on the magnesium alloy; 2), rolling the magnesium alloy in the solid solution state, and the rolling temperature is 300-400 ℃ ℃, the rolling speed is 0.2m / s‑0.6m / s, the number of rolling passes is 3‑8 times, and the total deformation is 50%‑80%; 3) Carry out an air hammer on the rolled magnesium alloy Hammering, the direction of hammering is perpendicular to the surface of the rolled plate, the hammering temperature is room temperature, the number of hammering times is 1‑4 times, the cumulative hammering strain is 1‑3%, and the speed of the hammer head before it touches the magnesium alloy is 1m / s~40m / s. The invention controls the magnesium alloy structure, so that the magnesium alloy undergoes creep dynamic precipitation in the high temperature creep process, and the creep dynamic precipitation phase improves the thermal stability of the material and improves the high temperature creep performance. Application promotion is of great significance.

Description

technical field [0001] The invention relates to a processing method for improving the high-temperature creep performance of a magnesium alloy through rolling and hammering, and belongs to the technical field of magnesium alloy processing. Background technique [0002] Magnesium alloy is an alloy composed of magnesium and other elements. Its characteristics are: low density (1.8g / cm 3 Left and right), high strength, large elastic modulus, good heat dissipation, good shock absorption, greater impact load capacity than aluminum alloy, and good corrosion resistance to organic matter and alkali. Magnesium-aluminum alloys are currently the most widely used, followed by magnesium-manganese alloys and magnesium-zinc-zirconium alloys. Mainly used in aviation, aerospace, transportation, chemical industry, rocket and other industrial sectors. AZ91 magnesium alloy is one of the most widely used commercial magnesium alloys, and its main use states are as-cast and aged. As-cast struct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06C22C23/02B21J5/00B21B37/74B21B3/00
CPCC22F1/06C22C23/02B21J5/002B21B37/74B21B3/00
Inventor 黄伟颖李微黄煌邱玮陈荐
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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