Processing method for improving high-temperature creep properties of magnesium alloys by rolling and pre-compression

A processing method and high-temperature creep technology, applied in metal rolling and other directions, can solve the problems that the high-temperature creep properties of alloys have a very large impact, limit the application scenarios of alloys, and affect the properties of alloys, so as to improve high-temperature creep properties and reduce costs. , the effect of grain refinement

Active Publication Date: 2022-02-08
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the deformation process, the coarse Mg at the grain boundary 17 Al 12 It is easy to form crack source and produce cracks, which will adversely affect the performance of the alloy
The age-strengthening precipitates in this alloy are Mg 17 Al 12 During the aging process, it is mainly coarse lamellar discontinuous precipitates, which are easy to become the source of cracks and have a great impact on the high temperature creep properties of the alloy, which limits the application scenarios of the alloy

Method used

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  • Processing method for improving high-temperature creep properties of magnesium alloys by rolling and pre-compression
  • Processing method for improving high-temperature creep properties of magnesium alloys by rolling and pre-compression
  • Processing method for improving high-temperature creep properties of magnesium alloys by rolling and pre-compression

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Experimental program
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Effect test

Embodiment 1

[0031] The magnesium alloy was 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 were smelted , the as-cast structure of the magnesium alloy is obtained by pouring. 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.

[0032] 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 orienta...

Embodiment 2

[0036]The magnesium alloy was 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 were smelted , the as-cast structure of the magnesium alloy is obtained by pouring. 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.

[0037] 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 te...

Embodiment 3

[0040] The magnesium alloy was 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 were smelted , the as-cast structure of the magnesium alloy was obtained by pouring. The mass percentage composition of the magnesium alloy is: Al: 9.1%, Zn: 0.61%, Mn: 0.15%, Y: 0.3%, and the rest is magnesium and impurity elements that cannot be removed.

[0041] 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 the...

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Abstract

The invention discloses a processing method for improving the high-temperature creep performance of a magnesium alloy through rolling and pre-compression, which is characterized in that the mass percentage composition of the magnesium alloy is: Al: 8.5%-9.5%, Zn: 0.45%-0.90%, Mn : 0.15%~0.4%, Y: 0.3%~0.8%, and the rest are magnesium and impurity elements that cannot be removed; the processing method includes the following steps: 1) performing solid solution treatment on magnesium alloy; The magnesium alloy is rolled, the rolling temperature is 300~400°C, 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) Perform pre-compression deformation on the rolled magnesium alloy, the pre-compression direction is perpendicular to the rolling plate surface, the pre-compression temperature is 20°C-100°C, the compressive strain is 0.01-0.02, and the strain rate is 1×10 ‑4 the s ‑1 -2×10 ‑4 the s ‑1 , and keep the compression deformation for more than 5min. The invention adjusts the microstructure of the magnesium alloy so that the magnesium alloy undergoes creep dynamic precipitation during 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.

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 pre-compression, 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/02C22F1/06B21B3/00
CPCC22C23/02C22F1/06B21B3/00
Inventor 黄伟颖李微黄煌周立波邱玮
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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