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gdevine
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T6 Aluminum - Heat Treat for Formability

01/15/2009 11:48 AM

I am involved in the process of bending and flaring tubes and tubular assemblies for fluid conveyance systems.

We are often required to form 6061 T6 aluminum (AMS 4083). When the wall thickness gets thinner it becomes more difficult to form and bend. Especially when it is old stock and it has age hardened.

We have, in the past, heat treated this material to make it easier to work with. But this, of course, changes the T6 temper and (if the heat treat is not done properly) that characteristics of the material.

I am currently looking for information on the heat treating for formability of the material and how to maintain or re-temper to T6.

My goal is to spec out the requirements and procedures necessary.

If anyone could point me in the right direction I would appreciate it.

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raggededgge
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#1

Re: T6 Aluminum - Heat Treat for Formability

01/15/2009 11:59 PM

What pressures and tube diameters are you working with?
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gdevine
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#4
In reply to #1

Re: T6 Aluminum - Heat Treat for Formability

01/16/2009 9:50 AM

We work with many sizes, however the most trouble comes with the diameter 0.375 and up with a 0.028 wall or thinner.

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bwire
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#2

Re: T6 Aluminum - Heat Treat for Formability

01/16/2009 4:14 AM

gdevine,

seek info@secowarwick.com

or

Intense sunlight and an oxygen enriched atmosphere will reduce temper of 6061 T6 in a matter of a few hours.

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Rangasamy
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#3

Re: T6 Aluminum - Heat Treat for Formability

01/16/2009 9:34 AM

Dear gdevine,

When cold working Al. alloys, such as 6061, that will be heat treated, the common practice is to form the tube or even bars in the " O " Temper ( annealed & recrystallised ), solution treat the part to the T4 temper and then Size or Form.

This procedure has 2 advantages : 1. After solution treatment, the material is reasonably soft which good for additional cold working. 2.Distorsion if any caused by solution treatment can be corrected in final sizing. After sizing, the part can be aged to the T6 Temper, if required.

In general Al.extusions are made to close Tolerances. The acuracy depends on size, shape, alloy, wall thickness, Type of tooling & equipment.

Lubrication & the part fit in the die are also important. Among the various types of Lubricants such as high viscosity oil, grease, wax, sodium- tallow soap, ZINC STEARATE is found to be the best lubricant for forming Aluminium.

Hope this helps you to form or deform without cracks.

Regards,

Rangasamy.

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gdevine
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#5
In reply to #3

Re: T6 Aluminum - Heat Treat for Formability

01/16/2009 11:54 AM

Thanks for the advice. Do you have any Specifications or sources I can review?

I don't think it would look good if my requirements quoted " per comment by Rangasamy on CR4 forum"

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Rangasamy
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#6
In reply to #5

Re: T6 Aluminum - Heat Treat for Formability

01/16/2009 8:34 PM

PLease visit the web-site- www.asminternational.org and click on ASM HTS ( Heat Treating Society ) to get your doubts cleared.

Good Luck !!!

Rangasamy

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