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Synopsis: For the purpose of measuring austenite-to-ferrite transformation temperatures in niobium-bearing steels during controlled rolling ,various methods were investigated . The change in texture intensity as well as thosei n microstructure and strengths produced by deformation in the austenite-ferrite region was found to be use ful for this purpose, those giving the same Ar 3 temperature.A r3 temperature rises with the increase in the amount of deformation in non-recrystallization region . Thei ncrement is, however, much larger for a coarse austenite grain structure than for a fine one . Regardless of the difference in initial austenite grain sizes , Ar3 temperature reaches the same value when the deformationi n non-recrystallization region is increased to •`70%. The rise in Ar 3 temperature is due to strain-induced transformation and grain fragmentation caused by deformation bands .

Measurement of Austenite to Ferrite Transformation Temperatures in Niobium-Bearing Steels during Controlled Rolling