Sy nopsis H igh tem/Jerature tellsile deformatioll of a 0. / 6°o C steel was st1ldied over a wide rallge of straill rates from 18 to 2.73 x /0-• sec-I ill the austellite ral/ge. From metallographic obsenatiol/s al/d flow stress measuremel/ls it was revealed that the first flow stress maximum, a~I' the shape of the a-e curves, alld tne deformed structure ill high strail/s were unique .functiolls of the Z eller-Hollom on parameter, Z, which was calculated 01/ all activatioll energy for deformation (68.5 kcal/mol). The distillct structural challges occurred ill the initial hardenil/g stage below tlte strain at aM, al/d the r grain structures for high strail/s were of a mixture of fill e grains alld comparatively coarse graills, and the grain boul/daries of the latter were wavy on the whole regardless of z. 1t was cOl/sidered then that the deformatioll if a 0. 1 6~o C steel ill the r ral/ge was cOl/trolled ~Y the dynamic recrystallization p rocess assiJted by the migration of vacal/cies. al/d that this fact was closely related to the shape of the a-e curves, I/otably a sharp stress maximum or stress oscillatiol/s in low strain region followed by steady-state deformatioll in high strain region. I,Vhether a a-e curve was the stress peak type or the stress oscillation type depel/ded critica lljl 01/ the relative difference between tlze il/itial r grain size b~rore d,!/ormaliol/ al/d that dynamically rerrystallized under a high strain.
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