Preparing method for high-performance magnesium alloy bar

A magnesium alloy, high-performance technology, used in metal rolling, metal rolling, metal processing equipment, etc., can solve the problems of low strain accumulation efficiency, difficulty in meeting engineering requirements, and anisotropy decline, and overcome the strain deviation. Low, the effect of promoting dynamic recrystallization and improving yield strength

Active Publication Date: 2018-06-29
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current research on the application of this method to prepare ultrafine-grained magnesium alloys is still very limited, and most of them focus on the microalloying system. For example, T.Mukai et al. After the alloy was groove rolled for 18 passes at 200°C and 0.5m/s rolling conditions, its yield strength increased to twice that of the original extruded state, and at the same time the anisotropy decreased significantly, but the rolling passes were too many, That is, the strain accumulation efficiency is not high, and it is often limited and difficult to be widely used in actual industrial production (Strengthening Mg-Al-Zn alloy by repetitive oblique shear strain with caliberrol...

Method used

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  • Preparing method for high-performance magnesium alloy bar
  • Preparing method for high-performance magnesium alloy bar
  • Preparing method for high-performance magnesium alloy bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The billet whose composition is Mg-3.1Al-0.8Zn-0.4Mn (wt.%, AZ31) is selected, and after the selection is completed, its surface is treated with an angle grinder to remove its oil stain and scale. Afterwards, homogenize it, that is, place the billet in a heat treatment furnace filled with argon, raise the temperature to 400°C with the furnace, keep it warm for 8 hours, and then place it in warm water at 35°C for quenching. The homogenized billets were then machined into rods with a diameter d=35 mm. Preheat the machined bar to 350°C, and carry out groove rolling processing, with a rolling speed of 0.5m / s, and rolling 10 passes (during the groove rolling process, the number of passes is diamond hole-square hole pass-diamond hole pass - The order of the square hole passes is carried out alternately, that is, the diamond hole pass - the square hole pass alternately for 5 cycles, and the final rolling is set as square hole rolling; after each pass of rolling, the bar is rot...

Embodiment 2

[0047] The billet whose composition is Mg-3.1Al-0.8Zn-0.4Mn (wt.%, AZ31) is selected, and after the selection is completed, the surface is treated with 1000 mesh sandpaper to remove its oil stain and scale. Afterwards, homogenize it, that is, place the billet in a heat treatment furnace filled with argon, raise the temperature to 400°C with the furnace, keep it warm for 8 hours, and then place it in warm water at 35°C for quenching. The homogenized billets were then machined into rods with a diameter d=35 mm. Preheat the machined bar to 250°C, and carry out groove rolling processing. The rolling speed is 0.2m / s, and the rolling is 8 passes (during the groove rolling process, it is divided into diamond hole pass-square hole pass-diamond hole pass - The order of the square hole passes is carried out alternately, that is, the diamond hole pass - the square hole pass alternates 4 cycles, and the final rolling is set as the square hole rolling; after each pass is rolled, the bar is...

Embodiment 3

[0050] The billet whose composition is Mg-3.1Al-0.8Zn-0.4Mn (wt.%, AZ31) is selected, and after the selection is completed, its surface is treated with an angle grinder to remove its oil stain and scale. Afterwards, homogenize it, that is, place the billet in a heat treatment furnace filled with argon, raise the temperature to 400°C with the furnace, keep it warm for 8 hours, and then place it in warm water at 35°C for quenching. The homogenized billets were then machined into rods with a diameter d=35 mm. Preheat the machined bar to 250°C for groove rolling at a rolling speed of 0.5m / s for 8 passes (during the groove rolling process, the number of passes is diamond hole-square hole-diamond hole - The order of the square hole passes is carried out alternately, that is, the diamond hole pass - the square hole pass alternates 4 cycles, and the final rolling is set as the square hole rolling; after each pass is rolled, the bar is rotated 90° and immediately proceeds to the next p...

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Abstract

The invention discloses a preparing method for a high-performance magnesium alloy bar. The method comprises the following steps that a magnesium alloy raw blank is ground, subjected to homogenizationtreatment, pretreated and preheated, groove rolling machining is conducted, the roller speed ranges from 0.1 m/s to 0.5 m/s, 6-10 rolling passes are adopted, the area of each pass is reduced by 19.8%-24.6%, and the accumulated reduction amount is 71.9%-88.0%. In the groove rolling process, the rhombic hole pass and the square hole pass are alternately conducted, and square hole rolling is adoptedas final rolling; and after rolling of each pass is finished, rolling of the next pass is immediately conducted after the bar is rotated by 90 degrees. After groove rolling is finished, room-temperature cooling is conducted. According to the preparing method, the toughness of the alloy can be obviously improved, and the anisotropy of the alloy is improved. Meanwhile, the multi-direction deformation effect is improved through the adopted novel hole pattern, large strain can be more effectively guided in, the production efficiency is improved, and the preparing method is suitable for producing the high-performance magnesium alloy material in the industrial short process.

Description

technical field [0001] The invention relates to a deformation processing technology for high-performance magnesium and its alloy rods, in particular to a method for improving the mechanical properties of magnesium and its alloy rods by using multi-pass rolling, which belongs to the field of new metal material technologies. Background technique [0002] Magnesium alloy is currently the lightest metal structure material (density of 1.74g / cm 3 ), high specific strength, good impact resistance and damping performance, wide range of sources and easy processing and recycling, it has become one of the fastest growing materials for industrial applications at home and abroad. In recent years, with the advancement of energy-saving and emission-reduction measures, especially the introduction of the timetable for banning the sale of traditional fuel vehicles in various countries, the advantages of magnesium alloys in lightweight applications in the transportation field have become more ...

Claims

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Application Information

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IPC IPC(8): C22C23/02C22C23/04C22C23/00C22F1/06B21B37/46B21B27/02B21B3/00
CPCB21B3/00B21B27/024B21B37/46C22C23/00C22C23/02C22C23/04C22F1/06
Inventor 余晖李其智范少达李丽超杨明绪冯建航殷福星
Owner HEBEI UNIV OF TECH
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