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In Reply to: RE: LOL !!!!!!! posted by unclestu on July 28, 2014 at 13:16:10
The issue is one of hardness and brittleness of metals that may or may not result from Cryo and heating. I am referring to both cryo and heat tempering. Isn't that obvious? The OP was worried that heating the metal would destroy the effects of cryo. The answer is no, it wouldn't. However, now that I think about it, thermal shock is an issue for both cryo and heat tempering so I wouldn't try to make any judgements about the success or failure of cryo or heating with solder iron until about a week later. You also failed to grasp the implications of the NASA report, which actually answers the issues with copper and repeated cryo cycling and heat cycling that you were a little fuzzy on.
Edits: 07/28/14 07/28/14Follow Ups:
Correct, and you seem to consistently miss the boat, so to speak. There is a significant difference between tempering and annealing (try googling them). You example of annealing for swords is so fraught with inaccuracies as to be totally worthless
Also your understanding of Japanese samurai swords is also flawed and erroneous.
The keenness of the blade is achieved through forging the blade and repeatedly folding over the alternating section of high carbon steel with regular steel (low carbon). By repeated folding and forging the sword becomes comprises of many hundreds of layer of alternating steel.
The high carbon steel gives the blade the sharp edge as with modern kitchen knives ( professional types). AFter forging the blade is then heated up to a light red color and then quenched. But this is done only after coating the cutting edge with some clay which gives the traditional swords that wavy visible coloration, This insures the blades retains its hardness from forging and then anneals the backbone of the blade to insure it does not shatter.
It is interesting to note that the blades are forged straight and the curvature is derived from the shrinking process of the steel when quenched.
When you look up Japanese sword blades, please also look up work hardening, a process every metal worker is intimately familiar with
I am not referring to forging, I am referring to tempering, heat tempering. Stop trying to put words in my mouth. Here is a simple explanation of heat tempered swords. This explanation also describes how to avoid brittleness while achieving hardness during heat tempering.http://www.strongblade.com/prod/pop_tempered.html
Cheers
Edits: 07/29/14 07/29/14
Look up Japanese sword making. Their swords are forged and
The applied heat is necessary to weld the folds. It is the many layers of high carbon steel alternating with low carbon steel which gives the sword its resilience and the sharp edge.
I do not believe you understand the process and seem rather desperate to salvage your obvious error and misunderstanding.
Nt
Language for you? It would explain a lot since it was YOU who used the example of Japanese swords.
LOL !!!!!
Unfortunately your mind is not. I used the Japanese sword making as an example of heat tempering. Then you went off the deep end with all the irrelevant forging nonsense.
You simply used a horribly poor example. Get over it.
Japanese swords was actually an excellent example of what I was trying to say about heat tempering and hardness and brittleness. Your efforts to recover your composure after bobbling the ball are duly noted.
Desperate aren't you. You think that simply repeating your errors will convince others that it is true. LOL !!!!!!!!!
All they need to do is to google Japanese swords, tempering temperatures and forging, to know your errors, as you do not seem to understand the differences. In addition, there are numerous books written about the subject exploring the process and metallurgy involved in making Japanese blades.
There is a fundamental difference why Japanese swords were much superior to the tempered blades of the middle ages, even of the famous Damascus steels ( carbonized steel by thrusting the red hot blade into the body of a slave, originally). You'll have to read up though, although I do understand that may be difficult for you to comprehend ( at least by your current comments). Most readers of AA are NOT illiterate and do know their way round the 'net....
Sheesh..........
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