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Direct quench heat treatment for aluminum alloy castings

一种铝合金铸件、直接的技术，应用在热处理设备、热处理过程控制、制造工具等方向，能够解决晶格应变能量增大、延展率降低等问题，达到降低残余应力、提高生产率、减少工序和设备的效果

Inactive Publication Date: 2010-06-09
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hardness and strength increase with time at temperature as precipitates start to form, and ductility decreases due to increased lattice strain energy due to atomic spacing mismatch between precipitates and matrix

Method used

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  • Direct quench heat treatment for aluminum alloy castings
  • Direct quench heat treatment for aluminum alloy castings
  • Direct quench heat treatment for aluminum alloy castings

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0047] A set of 12V8 cylinder blocks made of 319 aluminum alloy (the composition of the alloy is shown in Table 1) is divided into five sections along the section through the center of the hole, each section is about 5 inches thick. The two end sections of each cylinder block were discarded, as the geometry and heating history of these sections were quite different from the remaining three sections.

[0048] Table 1: Chemical Properties of Alloy 319

[0049] Si

Fe

Cu

mn

Mg

7

0.4

3.0

0.2

0.35

[0050] Randomly group these thirty-six segments and follow figure 2 Heat treatment was carried out in two stages for each condition.

[0051] Table 2

[0052]

[0053] After heat treatment, samples were cut from each section; two from the bulkhead, two from the inner bolt hub and two from the outer bolt hub. figure 2 with 3 The Brinell hardness as well as the tensile strength and elongation for each heat treatment grou...

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Abstract

A heat treatment method for the direct quench of aluminum alloy castings is presented. An aluminum alloy casting can be heated to the solutionizing temperature. The temperature can be maintained for a period of time sufficient to dissolve the hardening elements into the aluminum solid solution and affect any morphological changes to non-soluble phases, such as speriodization of the eutectic silicon phase. After solutionizing, the aluminum alloy casting can be quenched. The aluminum alloy casting can be rapidly cooled from the solutionizing temperature directly to the aging temperature, eliminating the room temperature hold of a conventional process. Thereby, the process can reduce process steps and equipment, can improve throughput, and can eliminate some waste heat. Further, the process can reduce residual stress and can provide a potential to form new precipitates. Direct quench can also be used with the sequential aging of aluminum casting alloys.

Description

technical field [0001] The present invention generally relates to the heat treatment of age-hardenable cast aluminum alloys, and in particular to the heat treatment of cast aluminum alloys directly quenched from solution treatment to aging temperature. Background technique [0002] Aluminum-silicon alloy castings are generally produced in large quantities for a variety of applications. In many of these applications, such as cylinder blocks and heads, transmission castings, and more, castings can be quite complex. In order to obtain adequate physical properties such as tensile strength, elongation and hardness, aluminum-silicon alloy castings are usually heat-treated. [0003] The most common Al-Si casting alloys (eg 319, 356, 390) are strengthened by a mechanism known as age hardening or precipitation strengthening. The process typically consists of three steps: First, alloying elements are dissolved into aluminum solid solution at high temperatures. This step is called s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04C21D1/18C21D10/00C21D11/00
CPCC22F1/043
Inventor H·W·多蒂
Owner GM GLOBAL TECH OPERATIONS LLC
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