Re: Re: Metallurgy

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Posted by Erik on January 30, 2001 at 20:18:28:

In Reply to: Re: Metallurgy posted by Rick Denney on January 30, 2001 at 18:40:37:

You mentioned residual stress in your post. Correct me if I am wrong, but I believe this is what cryogenic cooling of brass instruments is supposed to reduce. I have talked to a couple people who knew others who underwent this process. They said that there was a noticable difference when they got it back from the shop. However, they also said that the effect (which I don't remember) quickly wore off significantly in a period of (if I recall correctly) less than 4 weeks.

Ok, now my real question to you, Mr. Denney: How would one go about reducing the residual stress in an instrument? In the cryogenic process, the instrument seems to quickly return to an "equiibrium," presuably influenced by the constuction. So, given your knowledge of the subject (which I realize may not be complete), how is this stress reduced permanently in a brass instrument?

Thanks in advance for any response,


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