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Сообщение от av_ic
Well, it looks like it's a bit harder than I thought
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Good Day,
Indeed it is a tough task.
"Закалка" or heat hardening is a different process from the work hardening, it is part of heat treatment of steel, or part of "термообработка".
Burnishing is a process of hardening by working the surface with the tool made of hard material, a kind of case hardening, by making the molecular structure of the surface denser and therefore very bright and shiny but only as a side effect.
I would be brave enough to try and name it "упрочивание поверхности метала работом".
Although I expect someone, who has positive knowledge of the subject, to correct me as I feel that I have made a wrong choice of words, and I am sure that it is not quite correct grammatically as well.
Cheers
Душан