CPM10V HEAT TREAT Problem
CPM10V HEAT TREAT Problem
(OP)
CPM10V gear blanks were left in 2030 deg F. vacuum furnace for 11 hours due to T/C malfunction.
Vendor is looking for a way to determine effect of this on integrity of parts and what testing, such as tensile or charpy, may indicate if parts can be used.
Thanks
Vendor is looking for a way to determine effect of this on integrity of parts and what testing, such as tensile or charpy, may indicate if parts can be used.
Thanks





RE: CPM10V HEAT TREAT Problem
I asume you quenched the blanks after 11 hours isn't it? Or it was a malfunction during tempering?
I asume too that you are looking for comments on alternatives for performing the blank integrity tests.
Anyhow, you could try microstructural analysis and microhardness testing, what is pretty quick and can help avoiding the need of having to machine the test specimens. Look for abnormaly big carbides and big differences of microhardness in different spots of the same part.
If these tests show similar values to the ones you normally have, consider using the parts straight away.
If not, unless you suffer from abnormal carbide growth I don't see a problem for austenizing, solubilizing the carbides again, requenching the blanks and retempering to have them back in the regular state you work at, prior to finishing the part processing.
If you have generated big carbides, then consider running tensile tests and charpys since you might have reduced the elongation and the impact energy of your material, just to make sure that you keep fulfilling your customer 's specs.
Or, to be on the safest side, you can also try to ask directly to the crucible support center:
techservices@crucible.com
since they are who know most about their steel.
Hope you can recover your blanks!
RE: CPM10V HEAT TREAT Problem
RE: CPM10V HEAT TREAT Problem
Crucible's Pittsburgh facilities have been bought by Alleghany Industries and the Syracuse facilities bought by a group out of Cleveland that says it will continue the Syracuse operation.
RE: CPM10V HEAT TREAT Problem
My biggest concern would be grain growth. The grain size is affected by the austenitizing temperature and the time the parts are held at that temperature. Time is less of a factor than temperature, but 11 hours is excessive. You should have a metallurgical examination performed to determine the Snyder-Graff grain size, as well as the carbide size and distribution. Hardness will probably measure out OK provided the quench was performed correctly. But you may run into some toughness issues if the grain size is excessively large, which I expect it to be.
Maui