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Hi Dhurjati, Thanks for your response. We check the microstructure after processing each batch. During the case carburizing process, we heat the part to above Ac1 temperature for a long time. However after quenching we are observing these spots. Please find carburizing cycle below: Case...

Hi mfgenggear thanks for the feedback. I will submit the samples to a lab so they can check under an electron microscope. Hi Dhurjati, we will get in touch with the steel manufacturer. However I would like to get your views as to why the graphite nodules dissolve / disappear after...

Hi All, This is my first post so sorry if I have made any mistakes. I am facing issues during case carburizing of universal joint crosses of 20MnCr5 raw material. I am observing black spots in the core microstructure after carburizing. These spots are visible are etching and polishing and also...