Author Topic: Cast iron ''SPRUES'' can they be of use to the model machinist?  (Read 15458 times)

Offline MuellerNick

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Re: Cast iron ''SPRUES'' can they be of use to the model machinist?
« Reply #45 on: August 25, 2013, 11:04:02 AM »

I don't think I have to translate "liquidus" and "solidus", even if it is Latin.

First, we have to understand binary eutectic alloys (see picture 1):


We have a liquidus-line. Above that, everything is liquid.
We have a solidus-line. Below that, everything is solid.
So area (1) is completely liquid.
Area (3) is completely solid.
At the eutectic point, the alloy changes completely from solid to liquid.


Now what's on in the areas (2)?
Here, we have a mix of solids and liquids. In a binary system (components A and B), the further we are away from the eutecticum, the more solids of component A or B we have "swimming" in the liquid. This is the superfluous component to get a perfect eutectic alloy.


Now, if we look at picture two:
This is a oversimplified Fe-C diagram. It is only useful right of the 4%-point. The important point is, that it doesn't stop at 10% C, it goes all the way up to 100% C (quite useless from the POV that we want a cast-able iron).
But if you accept that the area (2) of the first picture contains a mix of solids and liquids, we see that at 10% carbon content, 6% are solid Fe3C. These Fe3C are small crystals, no big blobs or whatever that considerably change the viscosity.


Nick

Offline tel

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Re: Cast iron ''SPRUES'' can they be of use to the model machinist?
« Reply #46 on: August 25, 2013, 12:06:37 PM »
All of these numbers are a bit technical for me busy relaxing at home... All I can say is the latest two sash weight have been recovered from the ashes of the bonfire and they cut on the mechanical hacksaw like butter  8)

Which is some what different from when they started  :facepalm2:

Jo

I'm with you Jo - the original question was quite simple, and the simple answer is/was 'perhaps' but it seems to have run away from that.
The older I get, the better I was.
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Offline Bezalel

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Re: Cast iron ''SPRUES'' can they be of use to the model machinist?
« Reply #47 on: August 25, 2013, 12:27:45 PM »
Good point Tel

I went back and re-read the original question which was;


what do you guys think?

John.

So now you know...... some of us think way toooooo much   :lolb:

Bez
Queensland - wet one day, humid the next

Offline kellswaterri

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Re: Cast iron ''SPRUES'' can they be of use to the model machinist?
« Reply #48 on: August 25, 2013, 12:59:16 PM »
I seem to have created a ''Monster''
                     Frank N. Stein...aka
                                     John
Brilliant debate.......

Offline tel

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Re: Cast iron ''SPRUES'' can they be of use to the model machinist?
« Reply #49 on: August 26, 2013, 09:46:45 AM »
Yeah, but they don't always take de bait!  ;)
The older I get, the better I was.
Lacerta es reptiles quisnam mos non exsisto accuso nusquam