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A method for crushing and spheroidizing the second phase in magnesium alloy by heating and rotating rolling

A magnesium alloy, clockwise rotation technology, applied in the field of metal material rolling processing, can solve the problems of difficulty in greatly improving the comprehensive mechanical properties of magnesium alloys, inability to mass industrial production, high production costs, etc., to promote dynamic recovery and dynamic recovery. The effect of crystallization, broadening the range of composition design, and saving energy consumption

Active Publication Date: 2020-05-08
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as-cast magnesium alloys will inevitably produce a large number of dendrites and coarse eutectic phases, and in the composition design process of magnesium alloys, some elements will form large-sized second phases (tin, calcium, zinc, etc.) after combination, even Difficult to remove after high temperature heat treatment
[0003] Calcium can play the role of flame retardancy, so it is especially suitable for large-scale smelting production, but when calcium is added together with some alloying elements, due to its low solid solubility, a coarse second phase will be produced in the matrix, It needs solid solution at high temperature and long time in protective gas, which leads to higher production cost and limits its industrial application
[0004] It is generally believed that the large-sized second phase in the magnesium alloy will split the matrix during the deformation process, leading to early initiation of cracks, thereby reducing the plasticity.
At present, the methods of crushing the second phase include extrusion at a slow speed and large extrusion ratio, and large deformation such as equal-diameter angular extrusion. The above-mentioned methods are currently limited to the stage of preparing small samples in the laboratory, and cannot be mass-produced industrially. Improving the Comprehensive Mechanical Properties of Magnesium Alloys

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  • A method for crushing and spheroidizing the second phase in magnesium alloy by heating and rotating rolling
  • A method for crushing and spheroidizing the second phase in magnesium alloy by heating and rotating rolling
  • A method for crushing and spheroidizing the second phase in magnesium alloy by heating and rotating rolling

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Effect test

Embodiment 1

[0032] A method for increasing temperature and rotating rolling to fragment and spheroidize the second phase in magnesium alloy, comprising the following steps:

[0033] S1, pre-heating treatment

[0034] In a temperature environment of 250°C, the magnesium alloy sample was heat-preserved for 20 minutes to eliminate segregation inside the magnesium alloy sample and reduce rolling cracking. After heat preservation, warm water at 40°C was used to quench the magnesium alloy sample;

[0035] S2, the second phase of single-pass crushing

[0036] The magnesium alloy sample was preheated at 250°C for 10 minutes, and rolled in a single pass with a rolling reduction of 15%, so that cracks were generated in the large-sized second phase;

[0037] S3. Spheroidizing the second phase by heating and rotating rolling

[0038] S31. Rotate the magnesium alloy sample clockwise by 90° after the single-pass rolling, keep it warm for 5 minutes in a temperature environment of 200°C, and perform th...

Embodiment 2

[0047] A method for increasing temperature and rotating rolling to fragment and spheroidize the second phase in magnesium alloy, comprising the following steps:

[0048] S1, pre-heating treatment

[0049] In a temperature environment of 350°C, the magnesium alloy sample was heat-preserved for 60 minutes in order to eliminate segregation inside the magnesium alloy sample and reduce rolling cracking. After heat preservation, warm water of 60°C was used to quench the magnesium alloy sample;

[0050] S2, the second phase of single-pass crushing

[0051] The magnesium alloy sample was preheated at 300°C for 20 minutes, and rolled in a single pass with a rolling reduction of 20%, so as to generate cracks in the large-sized second phase;

[0052] S3. Spheroidizing the second phase by heating and rotating rolling

[0053] S31. Rotate the magnesium alloy sample clockwise by 90° after single-pass rolling, keep it warm for 15 minutes in a temperature environment of 250° C., and perform...

Embodiment 3

[0064] A method for increasing temperature and rotating rolling to fragment and spheroidize the second phase in magnesium alloy, comprising the following steps:

[0065] S1, pre-heating treatment

[0066] In a temperature environment of 250°C, the magnesium alloy sample was heat-preserved for 20 minutes to eliminate segregation inside the magnesium alloy sample and reduce rolling cracking. After heat preservation, warm water at 40°C was used to quench the magnesium alloy sample;

[0067] S2, the second phase of single-pass crushing

[0068] The magnesium alloy sample was preheated at 250°C for 10 minutes, and rolled in a single pass with a rolling reduction of 15%, so that cracks were generated in the large-sized second phase;

[0069] S3. Spheroidizing the second phase by heating and rotating rolling

[0070] S31. Rotate the magnesium alloy sample clockwise by 90° after the single-pass rolling, keep it warm for 5 minutes in a temperature environment of 200°C, and perform th...

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Abstract

The invention relates to the field of metal material rolling processing and particularly discloses a method for carrying out warming, rotary rolling, fragmentation and spheroidization on a second phase in magnesium alloy. The method comprises the following steps: S1, carrying out earlier stage thermal insulating treatment; S2, carrying out single-pass fragmentation on the second phase; and S3, carrying out warming and rotary rolling on the second phase. According to the method, warming four-pass rotary rolling is utilized, and clockwise 90-degree rotation is realized each pass, so that the situation that the second phase is cured in a multidirectional manner is ensured, and submicron order second phase also can separate out dynamically; and in addition, high-density dislocation is introduced during first-pass low temperature rolling to promote dynamic recrystallization and realize the purpose of refining grain during the following warming rolling process; and moreover, the submicron order second phase and fine grain structures improve the strengthening and processing hardening capacity and improve the strength and plasticity simultaneously.

Description

technical field [0001] The invention relates to the field of rolling processing of metal materials, in particular to a method for crushing and spheroidizing the second phase in a magnesium alloy by temperature-rising rotary rolling. Background technique [0002] As the lightest structural material currently available, magnesium has great application value and broad prospects in light weight. The mechanical properties of magnesium alloys are closely related to the second phase, texture, grain size and other factors. Improving the shape, size and distribution of the second phase will greatly increase the tensile strength and elongation of magnesium alloys. However, as-cast magnesium alloys will inevitably produce a large number of dendrites and coarse eutectic phases, and in the composition design process of magnesium alloys, some elements will form large-sized second phases (tin, calcium, zinc, etc.) after combination, even It is also difficult to eliminate after high temper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06
CPCC22F1/06
Inventor 查敏邢昊王慧远王珵刘金明杨一徐虹
Owner JILIN UNIV
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