Material change with relation to rate of cooling?
Material change with relation to rate of cooling?
(OP)
I have two identical sockets. They were made from the same material and were both hot forged at 1600 degrees F. The only difference is that after forging, one socket was air cooled to room temperature and the other was initially air cooled to 1200 degrees F followed by convection/fan cooling to room temperature.
Simply based on this information, what might I expect as far as material changes (decarb, grain size, etc.) and could these negatively affect further forming/machining?
I have just begun sectioning of these parts and will then make mounts for microscopic evaluation. I just wanted to get an idea of what to look for beforehand. I would greatly appreciate any input.
Simply based on this information, what might I expect as far as material changes (decarb, grain size, etc.) and could these negatively affect further forming/machining?
I have just begun sectioning of these parts and will then make mounts for microscopic evaluation. I just wanted to get an idea of what to look for beforehand. I would greatly appreciate any input.





RE: Material change with relation to rate of cooling?
Here two lessons dealing with the heat treatment of metals that may help you. There is link to The ASM educational materials site has information on various courses of all types you can take on, or self-study..
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RE: Material change with relation to rate of cooling?
Or if you have the spare time, find the convective heat transfer coefficients for your two cases. (A mech'l engr problem, not too difficult.) Model the socket as a protruding element of a heat exchanger to find cooling rates (non-linear). Refer to the CCT diagram for a better estimation of what the resulting phase morphology might be.
RE: Material change with relation to rate of cooling?
RE: Material change with relation to rate of cooling?
Here is a link to a free CCT/TTT diagram calculator:
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It is a good resource, but it is not as detailed as some of definitive references like ASM's Atlas of Time-Temperature Diagrams for Irons and Steels.