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RE: Nitriding and Crankshaft Durability

To: "'Larry Young'" <larry.young@pobox.com>, "'FOT'"
Subject: RE: Nitriding and Crankshaft Durability
From: "Jerry Barr" <jerrybarr@charter.net>
Date: Thu, 13 Oct 2005 19:07:56 -0500
Didn't we have a discussion on this a while back? In that discussion I
thought someone brought up the benefits of using both processes. Do you
guys remember that or is old age catching up to me?

-----Original Message-----
From: owner-fot@autox.team.net [mailto:owner-fot@autox.team.net] On
Behalf Of Larry Young
Sent: Thursday, October 13, 2005 5:29 PM
To: FOT
Subject: Re: Nitriding and Crankshaft Durability

Actually, the alternative nitriding process I was referring to is still 
a thermal process, but runs at something like 400 degrees rather than 
900 degrees.
Larry

Charly Mitchel wrote:

>Have you ever heard of cryogenically treating metal?  It use the
reverse
>process(kinda) or nitrating, cooling instead of heating.  You don't
have to
>do anything to the part to retrue it after treatment.  I have a cryo
treated
>crank in my TR6 for about 17 race weekends or the equivalent of about
2000
>race miles.
>^Charly
>TR6 #44
>----- Original Message ----- 
>From: "Larry Young" <larry.young@pobox.com>
>To: "FOT" <fot@autox.team.net>
>Sent: Thursday, October 13, 2005 11:53 AM
>Subject: Nitriding and Crankshaft Durability
>
>
>  
>
>>I've got a couple questions for our resident metallurgists.  Of
course,
>>nitriding hardens the bearings surfaces and reduces wear.  But, will
it
>>make the crankshaft less likely to crack?  Is there more than one
method
>>of nitriding and what are the differences?  I have been using a shop
>>that nitrides at around 900 degrees, so they must go through a stress
>>relieve and straighten process before grinding.  I understand there
are
>>lower temperature processes that do not require stress relieving.  Are
>>the results comparable?
>>Thanks,
>>Larry Young

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