Cryo treatments:tougher or brittler?

[fitzo]

.......I made the statement about metals not having molecules based on this article http://www.knivesby.com/robert-cella-1.html , which I found very interesting..........

Perhaps mete will explain why he and that Robert Cella fellow are in such exact agreement.......

See ya later, folks... I just wanted mete to see that article was all.

 

[David Wesner]

Oh man fitzo , let me guess . One and the same ??? If that is what you're saying I feel like a real dufuss.I looked at mete's profile for a possible answer but he wants to stay elusive Oh well , still a great article.

 

[Steve Hayden]

In a pure iron system it would be somewhat correct to deny the existence of molecular structure. Steel, however is not pure metal. High alloys are even less since they may contain 20% or greater mole percent carbides. If you do a little research on the physical chemistry of carbides, you will find the they are hybrid bonded, with mostly covalent bonds that have some ionic component and may share some or all of their 2 outer shells in metallic bonding.

To say that steel is non-molecular is either an oversimplification or an untruth.

 

[mete]

HE'S AN IMPOSTER !!!! Look at my avatar that's the real me .And that's a titanium belt buckle , I'll have you know !!

 

[Larrin]

HE'S AN IMPOSTER !!!! Look at my avatar that's the real me .And that's a titanium belt buckle , I'll have you know !!

What happened to your eye? And, I don't want to bring up any sensitive subjects, but what happened to your ears?

 

[mete]

The ears are to better hear the martensite transformations [they occur at the spead of sound ].

 

[calphad.com]

In a vast majority of cases, cryogenic heat treatment is not necessary at all, provided that the steel is tempered properly, i.e., in a way that eliminates the retained austenite (by transforming it into martensite, which then has to be tempered).

Dr. K.

www.calphad.com