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Repeat Heat treat

Repeat Heat treat

Repeat Heat treat

We are mfg aerospace parts. For one of the parts named Piston, material, Steel we didn't put Fracture specimen with the machined part in Oven during heat treatment. Now We found that we needed to do that just after heat treatment. Now we have only one option and that is we can repeat heat treatment of that machined part (piston)with fracture specimen.
Is that Possible to repeat heat treatment.
What do we need to check before doing that?


RE: Repeat Heat treat


Are you certain that the only option is to repeat the heat treatment?  What is the exact requirement with regards to the heat treat process and the part/fracture specimen?  Do you have any data from the first heat treat process that was performed (time in furnace, thermocouple data, furnace atmosphere, etc.)?  Is it possible to obtain a specimen from the heat treated part to perform some additional testing (metallography, mechanical testing, etc.)?

To answer your original question, yes, it may be possible to repeat the heat treat process, depending on the specific details.  What is the alloy?  What is the heat treat requirement?  Was any testing performed after the original heat treatment (metallography, mechanical testing, etc.)?  What data do you have?

RE: Repeat Heat treat

TVP is asking the right questions, however:

Is the fracture specimen a customer requirment?  If you are not the cognizant enginnering organization for the part you are manufacturing and heat treating (you are producing a part designed by and for someone else), you would be well advised to approach your aerospace customer with the situation and seek their guidance and apporoval for your next steps...

RE: Repeat Heat treat

Thanks TVP & Kenneth for your helpful information. I found the solution in the form of other option.After reviewing Mfg. Plan from the customer I found that If %reduction in tensile specimen is more than 55% then its not required to do fracture test.

Thanks again,


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