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Special magnesium alloy material for vehicle crankshaft and preparation method thereof

A magnesium alloy and crankshaft technology, applied in the field of magnesium alloys, can solve the problems of reduced alloy strength and toughness, wide crystallization temperature interval, poor corrosion resistance, etc., and achieve high strength, meet quality requirements, and excellent heat dissipation effects

Inactive Publication Date: 2017-01-04
YUYAO WANZHEN HARDWARE FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Of course, magnesium alloy also has its disadvantages in performance, such as wide crystallization temperature interval, easy to form solidification shrinkage distribution in the casting section, which reduces the strength and toughness of the alloy. Magnesium alloy has a close-packed hexagonal crystal structure, tensile strength, yield strength and elongation The low electrode potential (-2.37V) makes the corrosion resistance worse, which greatly limits the application of magnesium alloys.
Of course, magnesium alloy also has its disadvantages in performance, such as wide crystallization temperature interval, easy to form solidification shrinkage distribution in the casting section, which reduces the strength and toughness of the alloy. Magnesium alloy has a close-packed hexagonal crystal structure, tensile strength, yield strength and elongation The low electrode potential (-2.37V) makes the corrosion resistance worse, which greatly limits the application of magnesium alloys.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A special magnesium alloy material for automobile crankshafts, by weight percentage, silicon 4.0%, copper 3.7%, lithium 2.5%, tungsten 0.4%, chromium 0.5%, titanium 0.04%, boron 0.02%, nickel 0.001%, alum 0.001% , zirconium 0.001%, magnesium for the balance.

[0022] A kind of preparation method of the special magnesium alloy material of automobile crankshaft, concrete steps are:

[0023] (1) First, melt the above-mentioned materials by weight. After melting, keep the temperature at 1200°C for 0.5h, then lower the temperature to 200°C under the protection of nitrogen, and then increase the temperature by 100°C every 10 minutes until the temperature rises to 700°C;

[0024] (2) Then, perform constant temperature casting at 700°C, keep the speed of 35°C per second to cool down during casting, and cool down to 178°C;

[0025] (3) Then, under the atmosphere of ammonia gas, quenching treatment is carried out, the quenching temperature is 950 ° C, the treatment time is 30 m...

Embodiment 2

[0028] A special magnesium alloy material for automobile crankshafts, by weight percentage, silicon 4.5%, copper 3.9%, lithium 2.7%, tungsten 0.4%, chromium 0.5%, titanium 0.04%, boron 0.02%, nickel 0.001%, alum 0.001% , zirconium 0.001%, magnesium for the balance.

[0029] A kind of preparation method of the special magnesium alloy material of automobile crankshaft, concrete steps are:

[0030] (1) First, melt the above-mentioned materials by weight. After melting, keep the temperature at 1200°C for 0.5h, then lower the temperature to 200°C under the protection of nitrogen, and then increase the temperature by 100°C every 10 minutes until the temperature rises to 700°C;

[0031] (2) Then, perform constant temperature casting at 700°C, keep the speed of 35°C per second to cool down during casting, and cool down to 178°C;

[0032] (3) Then, under the atmosphere of ammonia gas, quenching treatment is carried out, the quenching temperature is 950 ° C, the treatment time is 30 m...

Embodiment 3

[0035] A special magnesium alloy material for automobile crankshafts, by weight percentage, silicon 5.7%, copper 4.7%, lithium 3.0%, tungsten 0.5%, chromium 0.7%, titanium 0.06%, boron 0.05%, nickel 0.003%, alum 0.002% , zirconium 0.002%, magnesium for the balance.

[0036] A kind of preparation method of the special magnesium alloy material of automobile crankshaft, concrete steps are:

[0037] (1) First, melt the above-mentioned materials by weight. After melting, keep the temperature at 1300°C for 0.8h, then lower the temperature to 200°C under the protection of nitrogen, and then increase the temperature by 100°C every 10 minutes until the temperature rises to 700°C;

[0038] (2) Then, perform constant temperature casting at 700°C, keep the speed of 38°C per second to cool down during casting, and cool down to 178°C;

[0039] (3) Then, under the atmosphere of ammonia gas, quenching treatment is carried out, the quenching temperature is 950 ° C, the treatment time is 30 m...

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PUM

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Abstract

The invention discloses a special magnesium alloy material for a vehicle crankshaft and a preparation method thereof. The special magnesium alloy material for the vehicle crankshaft comprises the following components in percentage by weight: 4.0-7.0% of silicon, 3.7-5.8% of copper, 2.5-4.0% of lithium, 0.4-0.6% of tungsten, 0.5-0.9% of chromium, 0.04-0.07% of titanium, 0.02-0.07% of boron, 0.001-0.004% of nickel, 0.001-0.003% of vitriol, 0.001-0.003% of zirconium, and the balance of magnesium. The high-performance magnesium alloy material with higher strength and hardness is prepared through selecting the specific formula, has the advantages of lightness and wear resistance, is excellent in heat dissipating capacity, and can satisfy the quality requirement of the vehicle crankshaft.

Description

technical field [0001] The invention relates to the technical field of magnesium alloys, in particular to a special magnesium alloy material for automobile crankshafts and a preparation method thereof. Background technique [0002] Magnesium alloy has the advantages of low density, high specific strength and specific stiffness, good thermal and electrical conductivity, damping and vibration reduction, electromagnetic shielding, easy processing and molding, and easy recycling of waste materials. Its application value is called "green engineering material" in the 21st century. Magnesium alloy has the advantages of low density, high specific strength and specific stiffness, good thermal and electrical conductivity, damping and vibration reduction, electromagnetic shielding, easy processing and molding, and easy recycling of waste materials. Its application value is called "green engineering material" in the 21st century. [0003] Of course, magnesium alloy also has its disadv...

Claims

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Application Information

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IPC IPC(8): C22C23/00
CPCC22C23/00
Inventor 沈婉珍
Owner YUYAO WANZHEN HARDWARE FACTORY