Preparation method of magnesium alloy steering wheel skeleton

A magnesium alloy and steering wheel technology, applied in the field of metal materials, can solve the problems of low strength and large elongation

Active Publication Date: 2018-04-06
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, Mg-Al alloy is currently the most widely used die-casting magnesium alloy, and the steering wheel frame is the most commonly used magnesium alloy die-casting, but the alloy grades currently used

Method used

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  • Preparation method of magnesium alloy steering wheel skeleton
  • Preparation method of magnesium alloy steering wheel skeleton

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Put the AZ91-F alloy steering wheel skeleton prepared by vacuum die-casting into a heat treatment furnace for solution treatment. The solution treatment temperature is set at 415°C, the furnace is installed at room temperature, the heating rate is set at 3°C / min, and the holding time is set 4h; after the completion of solution treatment, take out the sample and air-cool. The resulting steering wheel skeleton was sampled for tensile and fatigue performance tests. The tensile strength was 245MPa and the elongation was 9.8%. like figure 2 It can be seen from the comparison of the low-cycle fatigue life curves that the solution treatment has a great influence on the low-cycle fatigue behavior of magnesium alloys. Solution treatment improves the toughness of magnesium alloys, significantly increases the transition fatigue life (NT), and exhibits a higher fatigue life at high strain amplitudes.

Embodiment 2

[0033] Put the AZ91-F alloy steering wheel skeleton prepared by vacuum die-casting into a heat treatment furnace for solution treatment. The solution treatment temperature is set at 415°C, the furnace is installed at room temperature, the heating rate is set at 3°C / min, and the holding time is set 8h; after the completion of solution treatment, take out the sample and air-cool. The resulting steering wheel skeleton was sampled for tensile and fatigue performance tests. The tensile strength was 240MPa and the elongation was 10%.

Embodiment 3

[0035] Put the AZ91-F alloy steering wheel skeleton prepared by vacuum die-casting into a heat treatment furnace for solution treatment. The solution treatment temperature is set at 415°C, the furnace is installed at room temperature, the heating rate is set at 3°C / min, and the holding time is set 12h; after the completion of solution treatment, take out the sample and air-cool. The resulting steering wheel skeleton was sampled for tensile and fatigue performance tests. The tensile strength was 238MPa and the elongation was 10.8%.

[0036] in conclusion:

[0037] The strength and toughness of the material can be significantly improved by performing solution treatment on the die-cast steering wheel skeleton of the vacuum die-cast AZ91 magnesium alloy, especially the strain fatigue transition life under R=-1 can be improved by 80-100%, and the performance is excellent at high strain amplitudes. have a high fatigue life. Its comprehensive performance index is obviously better t...

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Abstract

The invention discloses a preparation method of a magnesium alloy steering wheel skeleton, and belongs to the technical field of materials. The preparation method is characterized in that an AZ91-F magnesium alloy and a preparation technology in which solution treatment is carried out after vacuum die-casting forming are mainly adopted to replace an AM50-F/AM60-F magnesium alloy and a preparationtechnology in which thermal treatment cannot be carried out after non-vacuum die-casting forming, wherein the die-casting pouring temperature is 670 DEG C to 690 DEG C, the mold temperature is 200 DEGC to 220 DEG C, the mold filling speed is 80 m/s, the solidification pressure is 70 MPa, the vacuum degree of a mold cavity is 5 KPa, the solid solution heating temperature is 415 DEG C, the heat preservation time is 8 h, and the cooling method is air cooling. Compared with an AM50-F/AM60-F magnesium alloy steering wheel skeleton, an AZ91-T4 magnesium alloy steering wheel skeleton has the advantages that the static tensile strength is improved by 20 MPa, the elongation is improved by 9%, the transition fatigue life under the condition that R equal to minus 1 is improved by 80% to 100%, and the AZ91-T4 magnesium alloy steering wheel skeleton has relatively long strain fatigue life at high strain amplitude.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a method for die-casting and heat treatment of a high-strength and toughness magnesium alloy steering wheel skeleton. Background technique [0002] In recent years, environmental and energy issues have become the focus, and magnesium alloy, as the lightest metal structure material, has become a research hotspot. Among them, Mg-Al alloy is currently the most widely used die-casting magnesium alloy, and the steering wheel frame is the most commonly used magnesium alloy die-casting, but the alloy grades currently used are almost all AM50 / AM60 die-casting magnesium alloys, which are characterized by strength lower than Another widely used die-casting magnesium alloy grade AZ91, but the elongation is much greater than AZ91. For this reason, a lot of research is currently trying to develop a die-casting alloy with the strength of AZ91, the plasticity is equivalent to that of AM50 / AM60 d...

Claims

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Application Information

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IPC IPC(8): B22D17/00C22F1/06
CPCB22D17/00C22F1/06
Inventor 王越魏子淇刘正王峰张峰毛萍莉
Owner SHENYANG POLYTECHNIC UNIV
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