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All Countries 🌏 Mcq University Model MCQ Single Answer ENGLISH HEAT TREATMENT OF METALS AND ALLOYS STEELS – AUSTENITIC GRAIN SIZE 2025

ENGLISH HEAT TREATMENT OF METALS AND ALLOYS STEELS – AUSTENITIC GRAIN SIZE SINGLE NOTMANAGE

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Why does the grain size of inherently fine grained steels become bigger than inherently coarse grained steels after a certain temperature?

At very high temperatures, the ultrafine precipitates dissolving in the matrix allow the grains to grow excessively.

A Because of dissolution ultramicroscopic oxides, carbides and nitrides
B Because of increase in number of ultramicroscopic oxides, carbides and nitrides
C Inherently fine grained steels can never have greater grain size than inherently coarse grained steels
D Because of breakage of ultramicroscopic oxides, carbides and nitrides

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