Superchilling/cooling castings and metals
Superchilling/cooling castings and metals
(OP)
Hi Everyone!
First time I've posted here, but I'm struggling to find any information regarding the supercooling (also known as superchilling)of metals and castings, particularly the effect on the materials grain structure and how it affects it mechanical properties. I've tried looking looking on the internet and in various books but there seems to be no information on the subject.
I would appreciate any information or help with this, cheers!
First time I've posted here, but I'm struggling to find any information regarding the supercooling (also known as superchilling)of metals and castings, particularly the effect on the materials grain structure and how it affects it mechanical properties. I've tried looking looking on the internet and in various books but there seems to be no information on the subject.
I would appreciate any information or help with this, cheers!





RE: Superchilling/cooling castings and metals
There is a lot of work out there regarding the impact of accelerating the cooling rate of castings.
We used to use cast iron chills in molds to get preferential cooling patterns in high Cr white cast iron.
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P.E. Metallurgy, Plymouth Tube
RE: Superchilling/cooling castings and metals
RE: Superchilling/cooling castings and metals
Clearly there are some applications where there are explicable and significant benefits to be obtained by using DCT but unhappily the industry seems to be populated by a large number of 'Snake Oil' salesmen who make preposterous claims that will never be substantiated.
It is clear that DCT an be beneficial in eliminating problems in tool steels caused by residual austenite and that in some cases can cause the precipitation of eta carbides but may of the claims beyond this seem to me to be pure BS,
Many of the claims made just don't stand up to any sensible asnalysis and few if any results are ever published.
Good Luck.
RE: Superchilling/cooling castings and metals
I have read some of his work. It has been a while but, as I recall, he was paid to run some tests for a cryogenics company. His results stated that sometimes something happened. I remember being impressed by his science and rather appalled at how it was represented by the cryogenics people.
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.
RE: Superchilling/cooling castings and metals
http://www.worldcat.org/title/metallurgy-for-the-n...
Maui
RE: Superchilling/cooling castings and metals
That post was worth a star, just for the link to worldcat.org. Thanks!
RE: Superchilling/cooling castings and metals
Cheers Maui, I've had a quick look at that book and it looks right up my street!
Thanks again to everyone, greatly appreciated!
RE: Superchilling/cooling castings and metals
DCT has been shown to create substantial increases in wear resistance and fatigue life in many metals, carbide tooling and in some plastics. Again, read the research. Yes, it can convert retained austenite to martensite and in some steels it does cause small carbides to precipitate. We are finding that it is also making changes in the crystal lattice structure. This is why it has an affect on non ferrous metals and carbides. This has confused many metallurgists who only look at grain structure. The idea that the austenite/martensite shift is the only thing happening ought to look at the huge increase in the life of cast iron brake rotors that are treated. They have a pearlitic micro-structure that has no retained austenite.
DCT has many uses in industry. Yes, many wild claims have been made about it. But many claims that sound wild are true. Those "doubters" who dismiss DCT without reading the research should be ashamed to call themselves engineers and scientists.
Again, read the research.