Big Fat Liars!!!! I love it!

[LyleG]

"why does steel get hard when you heat it and quench it?"

C'mon, dont leave us hanging here......:laugh:

 

[warbirdlover]

C'mon, dont leave us hanging here......:laugh:

LyleG

Okay, you asked for it!!

Steel is unlike other "metals" in that it can exist in more then one atomic crystalline lattice (body centered cubic and face centered cubic) depending on temperature. When steel is heated to above the "austenitizing" temperature (about 1550º F) these atoms "flip" from the body centered cubic to the face centered cubic shape. Carbon atoms are much smaller then the iron atoms so because of this change can fit in the "interstices" between the iron atoms. If you cool it slowly the carbon atoms would leave these interstices and everything would go back to as before. If you cool it very quickly (quench it) the iron atoms attempt to go back to the face centered cubic very quickly and "trap" the carbon atoms forming a new "tetragonal" crystalline structure which is highly stressed and very hard. Simple right? :laugh:

Other alloying elements like chromium and nickel are similar in size to the iron atoms so would replace the iron atom in one of their positions in the lattice. These elements would not effect the "hardness" at the surface but would increase the "depth" of the hardness (hardenability).

 

[SiberianDVM]

Steel is unlike other "metals" in that it can exist in more then one atomic crystalline lattice (body centered cubic and face centered cubic) depending on temperature. When steel is heated to above the "austenitizing" temperature (about 1550º F) these atoms "flip" from the body centered cubic to the face centered cubic shape. Carbon atoms are much smaller then the iron atoms so because of this change can fit in the "interstices" between the iron atoms. If you cool it slowly the carbon atoms would leave these interstices and everything would go back to as before. If you cool it very quickly (quench it) the iron atoms attempt to go back to the face centered cubic very quickly and "trap" the carbon atoms forming a new "tetragonal" crystalline structure which is highly stressed and very hard.

Yawn. That's been known since the Middle Ages. Got anything new?

 

[DaGris]

The thing of it is that if he shot 98 and he's a liar....he probably really shot 116

98 was posted on the website..

 

[warbirdlover]

Okay Doc, here's some "illustrations"... :laugh: (and it's only been known since the late 1800's)....

 

[warbirdlover]

Then if you want to see what this looks like on a larger scale...

(see Lyle, you opened a can of worms)...

The old blacksmiths used to hang a magnet above the fire pit and when the part was no longer attracted to the magnet they knew it could be quenched.

 

[DaGris]

dang this thread has gotten of topic:killersmiley:

 

[MCDavis]

geez, wbl..if I have to choose between those pics and your brother's...I'm going with sssmokin's!!!!!

 

[warbirdlover]

geez, wbl..if I have to choose between those pics and your brother's...I'm going with sssmokin's!!!!!

MCDavis

Then you're a very sick man!!! :laugh: And right now I'm very bored....

 

[MCDavis]

Then you're a very sick man!!! :laugh:

Well, I'm here aren't I?

Yep, bored also....

 

[Wi-Golfer]

a conversation on metallurgy.

And there was a crowd around

Metallurgy groupies????????:laugh:

 

[warbirdlover]

Metallurgy groupies????????:laugh:

Wi-Golfer

No, a bunch of family members who wanted to see this guy taken down a few notches!!!

 

[Clugnut]

Did you see the Nova where they showed how they make samurai swords in Japan, WBL? It was awesome, how they build the charcoal furnace, and the forger tends it for four straight days to make the steel. Amazing stuff.

 

[warbirdlover]

That is quite an "art" of laminating the layers of those Samarai swords. Those are the sharpest edges in the world and toughest blades since they alternate the layers with hard steel, soft steel, tough steel etc. In the days of the Samarai they had all these master sword makers who would give their finished product to a sword tester who was also very honored. The sword tester would make a cut from the neck down to the opposite side hip on a propped up cadaver (gross isn't it) and if he nicked the blade doing it he committed harikari sticking a knife in his gut. Those swords rarely failed to lop that cadaver in two. Serious business back then. That's why I loved the movie "Kill Bill" with the master sword maker. Only they all live in Japan, not Okinawa.

 

[chemboy2]

Okay, you asked for it!!

Steel is unlike other "metals" in that it can exist in more then one atomic crystalline lattice (body centered cubic and face centered cubic) depending on temperature. When steel is heated to above the "austenitizing" temperature (about 1550º F) these atoms "flip" from the body centered cubic to the face centered cubic shape. Carbon atoms are much smaller then the iron atoms so because of this change can fit in the "interstices" between the iron atoms. If you cool it slowly the carbon atoms would leave these interstices and everything would go back to as before. If you cool it very quickly (quench it) the iron atoms attempt to go back to the face centered cubic very quickly and "trap" the carbon atoms forming a new "tetragonal" crystalline structure which is highly stressed and very hard. Simple right? :laugh:

Other alloying elements like chromium and nickel are similar in size to the iron atoms so would replace the iron atom in one of their positions in the lattice. These elements would not effect the "hardness" at the surface but would increase the "depth" of the hardness (hardenability).

Just like you said in the earlier post, "blah blah etc etc". :laugh:

Good stuff and the illustrations are a nice touch!