During high temperature tempering at 500 degree Celcius some distortion in the lemellar structure was noticed. Can anyone suggest the reasons behind this phenomenon?
In your question I have found 2 notifications, first tempering time which remained unmentioned, second if you are tempering steel it means it was autenized and then quenched so the microstructure should be martesitic, not pearlitic, otherwise you are not tempering you are annealing. If you are annealing it could be because of cementite changing its morphology to spherodize structure which have lower internal energy.
In your question I have found 2 notifications, first tempering time which remained unmentioned, second if you are tempering steel it means it was autenized and then quenched so the microstructure should be martesitic, not pearlitic, otherwise you are not tempering you are annealing. If you are annealing it could be because of cementite changing its morphology to spherodize structure which have lower internal energy.
please go to the
Effect of high-temperature annealing on the microstructure and ...
link.springer.com/article/10.1134%2FS0031918X11010029
I am assuming you are just subjecting the pearlitic microstructure to 500C and there is no martensite to be tempered. If that is the case what you are observing is spherodization process. Cementite layers are being deformed to reduce surface energy.
Good question… Please check references below.. hope it will be helpful for you…
Regards…
https://www.asminternational.org/documents/10192/1849770/Chapter_15_WEB.pdf
https://file.scirp.org/pdf/JMMCE20110300006_82254563.pdf
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