Preparation method of high-strength and high-toughness metal material with shell-like brick mud structure

A technology of imitating shell and tough metal is applied in the field of preparation of high-strength and tough metal materials, which can solve the problems of no shell structure theory and technical research, and achieve the effects of easy promotion, increased toughness, and comprehensive performance improvement.

Active Publication Date: 2021-03-09
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these patents only focus on realizing the brick-and-mud structure by compounding different materials, and there is no theoretical and technical research on applying the shell structure to a single material.

Method used

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  • Preparation method of high-strength and high-toughness metal material with shell-like brick mud structure
  • Preparation method of high-strength and high-toughness metal material with shell-like brick mud structure
  • Preparation method of high-strength and high-toughness metal material with shell-like brick mud structure

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Effect test

Embodiment 1

[0038] A method for preparing a high-strength and tough metal material with a shell-like brick-mud structure, the specific steps are:

[0039] 1) Select the AZ31 magnesium alloy whose length, width, and thickness are 100mm, 100mm, and 2.5mm, and perform annealing treatment first. The annealing temperature is 350°C, and the annealing time is 4h. After the annealing is completed, clean the surface of the plate with acetone and alcohol to remove oil stains , and then clean the surface of the plate with deionized water;

[0040] 2) Put the AZ31 magnesium alloy plate on the workbench, start the alternating cooling and heating system 3, the cooling pipe is below the welding seam, and the two sides adjacent to the cooling pipe are heating pipes, the width of the cooling pipe is 5mm, and the width of the heating pipe is 5mm. 3.5mm, the liquid nitrogen flow rate is 30mL / s, the heating temperature is 200°C and the pre-tightening force is applied to lock;

[0041] 3) The size of the sti...

Embodiment 2

[0051] A method for preparing a high-strength and tough metal material with a shell-like brick-mud structure, the specific steps are:

[0052] 1) Select the AZ91 magnesium alloy whose length, width, and thickness are 100mm, 100mm, and 4mm, respectively, and anneal the plate first. The annealing temperature is 350°C, and the annealing time is 5h. Clean the surface of the plate with deionized water;

[0053] 2) Place the AZ91 magnesium alloy plate on the workbench, and start the alternate cooling and heating system 3. It is expected that the cooling pipe is below the welding seam, and the two sides adjacent to the cooling pipe are heating pipes. The width of the cooling pipe is 6mm, and the heating pipe The width is 4mm, the liquid nitrogen flow rate is 30mL / s, the heating temperature is 200°C, and the pre-tightening force is applied to lock;

[0054] 3) The size of the stirring head for friction stir welding is: the diameter of the shaft shoulder is 16mm, the diameter of the t...

Embodiment 3

[0062] A method for preparing a high-strength and tough metal material with a shell-like brick-mud structure, the specific steps are:

[0063] 1) Select the AZ31 magnesium alloy whose length, width and thickness are 80mm, 80mm and 2.5mm, respectively, and anneal the plate first. The annealing temperature is 400°C, and the annealing time is 4h. After the annealing is completed, clean it with acetone and alcohol to remove oil stains. Then use deionized water to clean the surface of the plate;

[0064] 2) Place the AZ31 magnesium alloy plate on the workbench and start the alternating cooling and heating system 3. It is estimated that the cooling pipe is below the welding seam, and the two sides adjacent to the cooling pipe are heating pipes. The width of the cooling pipe is 4mm, and the heating pipe The width is 4mm, the liquid nitrogen flow rate is 30mL / s, the heating temperature is 200°C, and the pre-tightening force is applied to lock;

[0065] 3) The size of the stirring hea...

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Abstract

The invention discloses a preparation method of a high-strength and high-toughness metal material with a shell-like brick mud structure. The preparation method comprises the following steps that S1, an alloy plate is completely annealed to eliminate anisotropy; S2, the surface of the annealed alloy plate is pretreated; S3, the pretreated alloy plate is placed on a workbench, an alternate cooling and heating system (3) is placed between the workbench and the alloy plate, and pre-tightening force is applied for locking; and S4, a stirring head is installed on friction stir machining equipment, the rotating speed, the welding speed, the machining distance, the pressing amount and the stirring needle front inclination angle of a stirring head are selected, the locked alloy plate is subjected to friction stir welding, and a first long and straight welding seam (1) is formed. According to the preparation method of the high-strength and high-toughness metal material with the shell-like brickmud structure, the shell-like brick mud structure is achieved through alternating of weld joints and base metal, the alloy strength is improved, meanwhile, the toughness of the material is reserved, and the method is an economical and effective technical method used for preparing the high-performance alloy plate and capable of achieving industrial production.

Description

technical field [0001] The invention relates to a preparation method of a high-strength and tough metal material with a shell-like brick-mud structure, belonging to the technical field of metal materials. Background technique [0002] Magnesium and magnesium alloys are currently the lightest metal structural materials, featuring low density, high specific strength, good heat dissipation, excellent damping and shock absorption, and ability to withstand large impact loads. Magnesium alloys have good toughness due to the addition of alloying elements, and have been widely used in aerospace, vehicle engineering and other fields. Magnesium alloys have low strength compared to titanium alloys or stainless steel, so their use is limited when subjected to large loads or strong impacts. At present, the severe plastic deformation (SPD) technology is commonly used to prepare ultra-fine-grained materials to increase the strength of magnesium alloys. These methods increase the strength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B23K20/12B23K20/24
CPCB23K20/122B23K20/24B23P15/00
Inventor 于皓巨佳蒋旭峰王安哲毛向阳陶学伟姜沅辰郭小金李愈鑫
Owner NANJING INST OF TECH
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