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Method for eliminating residual stress of magnesium alloy deformed processing material

A technology of deformation processing and residual stress, which is applied in the field of non-ferrous metal material processing, can solve the problems of alloy deformation failure, slow cooling speed, oversize, etc., and achieve the effect of excellent mechanical properties, high forming quality and elimination of residual stress

Active Publication Date: 2022-04-26
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Residual stress will seriously affect the forming quality and mechanical properties of deformed processed materials, which may induce stress corrosion cracks and fractures, affecting their service life
[0003] For medium-thick processed materials or large-diameter rods (the range of cross-sectional area is 1.3×10 5 ~2.8×10 5 mm 2 ) and other deformed processing materials, as the intermediate material for subsequent final molding, due to its large size and relatively slow cooling rate, it is impossible to eliminate the residual stress by conventional pre-stretching, but the existence of residual stress leads to alloy The main cause of subsequent deformation failure or deformation cracking, so it is necessary to find a more suitable solution for the elimination of residual stress

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The cross-sectional area is 2.8×10 5 mm 2 The composition ratio of the magnesium alloy processing material is: Mg-8Gd-4Y-1Zr-0.5Mn (wt.%), and the post-deformation treatment method comprises the following steps:

[0023] (1) On-line quenching measures are taken during the extrusion process: use 87°C hot water at 5 cm from the exit of the extruder for primary water cooling quenching, after the primary quenching, use 20°C room temperature water at 27 cm from the exit of the extruder for secondary Level water cooling quenching, after the second level quenching, use the automatic blast system to blow cold air to carry out the third level air cooling quenching;

[0024] (2) Carry out simple pressure straightening treatment on the part with larger warpage in the extruded processed material;

[0025] (3) Put the deformed material into the furnace for cold treatment, the temperature is -150°C, and the holding time is 4 hours. At the same time, the electric pulse generator is ...

Embodiment 2

[0030] The cross-sectional area is 1.5×10 5 mm 2 The composition ratio of the magnesium alloy processing material is: Mg-9Y-1MM-1Zn-0.5Zr (wt.%), and the post-deformation treatment method comprises the following steps:

[0031] (1) On-line quenching measures are taken during the extrusion process: use 90°C hot water at 10cm from the exit of the extruder for primary water-cooling quenching, after the primary quenching, use 30°C room temperature water at 25cm from the exit of the extruder Level water cooling quenching, after the second level quenching, use the automatic blast system to blow cold air to carry out the third level air cooling quenching;

[0032] (2) Carry out simple pressure straightening treatment on the part with larger warpage in the extruded processed material;

[0033] (3) Put the deformed material into the furnace for cold treatment, the temperature is -50°C, and the holding time is 8 hours. At the same time, the electric pulse generator is connected, and t...

Embodiment 3

[0038] The cross-sectional area is 2.5×10 5 mm 2 The composition ratio of the magnesium alloy processing material is: Mg-6Gd-4Y-1Zr-1Zn (wt.%), and the post-deformation treatment method comprises the following steps:

[0039] (1) On-line quenching measures are taken during the extrusion process: use 86°C hot water for primary water cooling quenching at 8 cm from the exit of the extruder. Level water cooling quenching, after the second level quenching, use the automatic blast system to blow cold air to carry out the third level air cooling quenching;

[0040] (2) Carry out simple pressure straightening treatment on the part with larger warpage in the extruded processed material;

[0041] (3) Put the deformed material into the furnace for cold treatment, the temperature is -75°C, and the holding time is 4.5 hours. At the same time, the electric pulse generator is connected, and the electric pulse energy field is applied to assist the heat treatment. The pulse form is positive ...

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Abstract

The invention discloses a method for eliminating residual stress of a magnesium alloy deformed processing material. The method comprises the following steps: (1) carrying out multi-stage online quenching treatment on the deformed processing material at an outlet of an extruding machine; (2) carrying out simple pressing and straightening treatment on the part with larger warping degree in the extruded processing material; (3) the deformed processing material is put into a furnace for subzero treatment, the temperature ranges from-150 DEG C to-50 DEG C, the heat preservation time ranges from 4 h to 8 h, and meanwhile an electric pulse energy field is applied to assist heat treatment; (4) ultrasonic impact is carried out on the processed material after heat treatment, the ultrasonic vibration amplitude is 20-50 [mu] m, and the vibration time is 5-20 min; and (5) the processed material is rapidly heated to 80-100 DEG C, heat preservation is conducted for 1-3 hours at the temperature, and then air cooling is conducted to the room temperature. According to the method, the method of subzero treatment, electric pulse auxiliary treatment, ultrasonic vibration and aging coupling is adopted, the residual stress in the rare earth magnesium alloy deformed machined material can be effectively eliminated, and the rare earth magnesium alloy deformed machined material which is more excellent in mechanical property and higher in forming quality is prepared.

Description

technical field [0001] The invention relates to a method for eliminating the residual stress of a magnesium alloy deformed processed material, belonging to the technical field of nonferrous metal material processing. Background technique [0002] Magnesium alloy deformed materials are important components in the fields of aerospace, weaponry and transportation. Due to the poor plasticity and large thermal expansion coefficient of magnesium alloys, uneven plastic deformation and inconsistent expansion and contraction often occur during hot forming, resulting in residual stress and thermal stress. Residual stress will seriously affect the forming quality and mechanical properties of deformed processed materials, which may induce stress corrosion cracks and fractures, affecting their service life. [0003] For medium-thick processed materials or large-diameter rods (the range of cross-sectional area is 1.3×10 5 ~2.8×10 5 mm 2 ) and other deformed processing materials, as th...

Claims

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Application Information

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IPC IPC(8): C22F1/06C22F3/00
CPCC22F1/06C22F3/00
Inventor 马鸣龙张奎钟晨李永军李兴刚石国梁袁家伟孙昭乾
Owner GRIMAT ENG INST CO LTD
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