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sudamavhad165
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Join Date: Apr 2010
Location: Mumbai
Posts: 8

What is the 885 F Embrittlement?

04/28/2010 1:55 AM

In the materials part I want to know that..

What is the 885 F embrittlement ?

Please reply in detail..

Thanks..
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Milo
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Join Date: Jul 2006
Location: "Dancing over the abyss."
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#1

Re: What is the 885 F Embrittlement?

04/28/2010 4:06 PM

Depends on the material.

885 F is above the range for Blue brittleness for carbon and alloy steel. (Which is typically 350~600F.)

http://www.springerlink.com/content/g5p188288176x386/

885F is the trigger temperature for grain boundary chromium precipitation in some stainless steels held for long periods in the range of say 750-950 F.

It is Time at temperature dependent (isn't most everything?)

Holding for long periods in this temperature range increases strength and hardness;while decreasing ductility (toughness), and affects corrosion resistance. Higher hardness + lower ductility= Brittleness.

milo

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strider6
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Join Date: May 2007
Posts: 225
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#2

Re: What is the 885 F Embrittlement?

04/29/2010 6:40 AM

885°F (475°C) embrittlement is a loss in toughness due to a metallurgical change that can occur in alloys containing a ferrite phase, as a result of exposure in the temperature range 600°F to 1000°F (316°C to 540°C).

885°F embrittlement is reversible by heat treatment to dissolve precipitates, followed by rapid cooling.

Vitt

corrosion prevention
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