A process for warm forming an age hardenable aluminum alloy in t4 temper

An age-hardening, aluminum alloy technology, applied in the field of aluminum alloys, can solve problems such as adverse effects on the ability of hardened parts, reduced formability, etc., to achieve the effect of improving fuel efficiency and reducing vehicle weight

Inactive Publication Date: 2018-06-08
NOVELIS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Elevating the temperature of heat-treatable age-hardenable aluminum alloys during the warm forming step will prematurely convert the aluminum alloy part or sheet to the T6 temper, leading not only to a reduction in formability (which may be detrimental to subsequent forming steps) but also adversely affects the ability of the manufacturer to harden the part during post-production heat treatment and / or aging

Method used

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  • A process for warm forming an age hardenable aluminum alloy in t4 temper
  • A process for warm forming an age hardenable aluminum alloy in t4 temper
  • A process for warm forming an age hardenable aluminum alloy in t4 temper

Examples

Experimental program
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Effect test

example 1

[0078] High temperature tensile test

[0079] High temperature tensile tests of AA6016 alloy samples were carried out. The test sample is a sample of formed AA6016 alloy, such as figure 1 shown in . These test pieces had a thickness of 1.2 mm. For the high temperature test, the samples were heated to various temperatures by induction heating at a heating rate of 90 °C / s. A pyrometer was used to measure the temperature of each sample. During the tensile test, maintain the specified test temperature for each specimen. figure 2 The heating curves of the AA6016 samples before and during the tensile test are shown, where the arrows indicate that the tensile test was started once these samples reached the target temperature. AA6016 coupons and steel coupons (DX56D (low carbon steel) from Voestalpine, Linz, Austria) were also tested at room temperature. Steel samples tested at room temperature were image 3 is referred to as "cold steel", while AA6016 specimens tested at roo...

example 2

[0082] Tensile test after heat treatment

[0083] Tensile tests of AA6016 alloy samples after heat treatment were carried out. The test sample is a sample of formed AA6016 alloy, such as figure 1 shown in . These test pieces had a thickness of 1.2 mm. For post-heat treatment tests, the samples were heated to various temperatures by induction heating at a heating rate of 90°C / s, cooled in water ("water quenching"), then quenched and aged at room temperature for one week. Samples of AA6016 maintained at room temperature ("room temperature samples") were also tested for comparison. Figure 4 The stress-strain curves of the AA6016 specimens after heat treatment are shown. Figure 4 The stress-strain curves after heat treatment shown in have roughly similar shape and magnitude and are also similar to the stress-strain curves of the room temperature specimen (ref T4). Figure 4 The stress-strain curves shown in show that the heat treatment employed in the tests did not alter t...

example 3

[0086] Tensile test after heat treatment of samples heated at different heating rates

[0087] Tensile tests after heat treatment of AA6016 alloy samples heated at different heating rates were carried out. The test sample is a sample of AA6016 alloy, such as figure 1 shown in . These test pieces had a thickness of 1.2 mm. As far as the test after heat treatment is concerned, by induction heating at a heating rate of 90 °C / s ( Figure 7 The upper set of curves in , and Figure 8 left histogram in each group) or a heating rate of 3°C / s ( Figure 7 The lower set of curves in , and Figure 8 Right histograms in each group in ) These samples were heated to (at Figure 7 and Figure 8 referred to as "HT") various temperatures, cooled in water (i.e., referred to as "WQ" for water quenching), naturally aged at room temperature for up to a week, heat treated at 180°C for up to 10 hours, then cooled to room temperature. Also for AA6016 kept at room temperature (in Figure 7 a...

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Abstract

Described are processes for shaping age hardenable aluminum alloys, such as 2XXX, 6XXX and 7XXX aluminum alloys in T4 temper, or articles made of such alloys, including aluminum alloy sheets. The processes involve heating the sheet or article before and/or concurrently with a forming step. The sheet is heated to a specified temperature in the range of 100-600 DEG C at a specified heating rate within the range of 3-600 DEG C/s, for example 3-90 DEG C/s. Such a combination of temperature and heating rate results in an advantageous combination of sheet properties.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and application benefit to US Provisional Patent Application Serial No. 62 / 239,014, filed October 8, 2015, which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to the field of aluminum alloys and related fields. Background technique [0004] Aluminum alloys combine low density with structural strength and crashworthiness, which makes them attractive for the production of structural and body parts in the automotive industry. However, aluminum alloys have lower formability compared to tensile grade steels. In some cases, the relatively low formability of aluminum alloys can make it difficult to obtain good part designs and can lead to failures due to cracks or wrinkling. Because aluminum alloys exhibit enhanced formability at elevated temperatures, warm forming of aluminum alloy sheets has been utilized in the automotive indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22F1/053C22F1/057C22C21/06C22C21/08C22C21/10C22F1/043C22F1/047C22F1/05
CPCC22C21/00C22C21/06C22C21/08C22C21/10C22F1/04C22C21/02C22C21/14C22C21/16B21D22/022B21D37/16B21D53/88C22F1/043C22F1/047C22F1/057B21D22/02
Inventor C.巴西E.坎巴斯A.德斯波斯P.罗曼M.菲莫J.理查德
Owner NOVELIS INC
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