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Machining method of small-specification high-strength magnesium alloy bars

A processing method and magnesium alloy technology, which is applied in the field of forming and processing of non-ferrous metals, can solve problems such as thermal cracking, narrow deformation temperature range, and grain growth, and achieve short process flow, improved yield strength, and increased tensile strength. Effect

Active Publication Date: 2017-05-31
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, magnesium alloy has a close-packed hexagonal crystal structure, which is prone to cracking when deformed at room temperature, and grain growth and thermal cracking are prone to occur when deformed at high temperature, and the appropriate deformation temperature range is narrow.

Method used

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  • Machining method of small-specification high-strength magnesium alloy bars
  • Machining method of small-specification high-strength magnesium alloy bars
  • Machining method of small-specification high-strength magnesium alloy bars

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Taking the AZ61 magnesium alloy bar with a diameter of 4.5mm processed by hot swaging as an example, the method is as follows:

[0022] The AZ61 magnesium alloy billet with a diameter of 12mm is subjected to 4 passes of hot swaging to obtain an AZ61 magnesium alloy rod with a diameter of 4.5mm. The cumulative compression rate of the AZ61 magnesium alloy rod after 4 passes of hot swaging is 85.9%. Before each hot swaging pass, evenly apply a lubricant mixed with graphite powder, molybdenum disulfide and butter according to the mass ratio of 2:1:12.5 on the outside of the magnesium alloy billet, and the feeding speed of hot swaging is 0.2m / min ~1m / min, hot swaging process parameters are shown in Table 1;

[0023] The hot swaging process parameter of table 1 embodiment 1

[0024]

[0025] After the 1st to 4th passes of hot swaging, the magnesium alloy billet is mechanically polished; after the 3rd pass of hot swaging, the magnesium alloy billet is subjected to an inter...

Embodiment 2

[0028] Taking the hot swaging method to process Mg-2Zn-0.1Ca rods with a diameter of 10mm as an example, the method is as follows:

[0029] The Mg-2Zn-0.1Ca billet with a diameter of 30 mm is subjected to 7 passes of hot swaging to obtain a Mg-2Zn-0.1Ca bar with a diameter of 10 mm. The Mg-2Zn-0.1 after 7 passes of hot swaging The accumulative compression rate of the Ca bar is 88.9%. Before each pass of hot swaging, a lubricant mixed with graphite powder, molybdenum disulfide and butter in a mass ratio of 2:1:15 is evenly applied on the outside of the magnesium alloy billet. The feeding speed of swaging is 0.8m / min~2m / min, and the technical parameters of hot swaging are shown in Table 2;

[0030] The hot swaging process parameter of table 2 embodiment 2

[0031]

[0032]

[0033] After the 1st to 7th passes of hot swaging, the magnesium alloy billet is mechanically polished; after the 4th pass of hot swaging, the magnesium alloy billet is subjected to an intermediate an...

Embodiment 3

[0036] Taking the processing of Mg-5Zn rods with a diameter of 8mm by hot swaging as an example, the method is as follows:

[0037] A Mg-5Zn billet with a diameter of 50 mm is hot swaged 6 times to obtain a Mg-5Zn rod with a diameter of 8 mm. The cumulative compression ratio of the Mg-5Zn rod after 6 times of hot swaging is 84 %, before each pass of hot swaging, evenly apply a lubricant mixed with graphite powder, molybdenum disulfide and butter in a mass ratio of 2:1:15 on the outside of the magnesium alloy billet, and the feeding speed of hot swaging is 0.2m / min~2m / min, hot swaging process parameters are shown in Table 3;

[0038] The hot swaging process parameter of table 3 embodiment 3

[0039]

[0040]

[0041] After the 1st to 11th passes of hot swaging, the magnesium alloy billet is mechanically polished; after the 4th pass of hot swaging, the magnesium alloy billet is subjected to an intermediate annealing treatment at 250 ° C for 60 minutes, and then the surfa...

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Abstract

The invention discloses a machining method of small-specification high-strength magnesium alloy bars. The method comprises the steps as follows: magnesium alloy bar blanks are subjected to multi-pass hot-swaging at a certain temperature, magnesium alloy bars with the diameter not larger than 10 mm are obtained and have the tensile strength larger than 290 MPa, the yield strength larger than 250 MPa and the cumulative compression rate ranging from 60% to 98%, intermediate annealing treatment is performed when the cumulative compression rate of hot-swaging exceeds 70%, and the cumulative compression rate between two adjacent times of intermediate annealing treatment ranges from 70% to 85%. The small-specification magnesium alloy bars are machined with the online heating and continuous hot-swaging method, and the method has the characteristics of being accurate in temperature control, high in heat efficiency, uniform and stable in bar performance and high in linearity. Besides, if the magnesium alloy bars are machined with the method, the single-pass compression rate of the bar can be increased, grains can be refined, and the second phase can be crushed, so that the strength of the bars can be substantially improved.

Description

technical field [0001] The invention belongs to the technical field of forming and processing of nonferrous metals, and in particular relates to a hot swaging method for small-sized high-strength magnesium alloy rods. Background technique [0002] Metal rod is a widely used profile, and high-strength magnesium alloy rod has a good application prospect as a degradable metal profile. At present, magnesium alloy rods are mainly processed by casting and extrusion methods. Cast magnesium alloys have coarse grains and poor mechanical properties. In contrast, the magnesium alloy rod prepared by extrusion has finer grains and higher strength and plasticity. However, extruding small-sized magnesium alloy rods with a diameter of less than 10 mm requires high molds and serious die loss, and the straightness of the extruded rods is poor. Plastic deformation is an important method to improve the mechanical properties, especially the strength, of magnesium alloys. However, magnesium a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
CPCC22F1/06
Inventor 王昌于振涛王云刘汉源张亚峰王岚
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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