Recrystallization of an 18-8 Austenitic Stainless Steel after Hot Rolling

I sothemwl 1"CClyslalli;:atioll of a commercial / 8-8 auslellitic siailliess sleel after hot rolling was invesl'igated by o/Jt ical alld transmissioll electron microscop)' and b), hardness measurement .The rolling and holding tem-/Jera ture were chosen belween 700 and 1 100 C. bolh being identical./ 11 the as-deformed slructure.well-arranged sli/J or deformation bands were Ilo /iced.Th e sites of lIucleatioll were graill boundaries alld also the " vicinity " of graill boundaries .Nucleation at twill boundaries was 1101 obserued.R ecovered substructure was observed ill the cs-defonned slale as rolling reductioll alld tem/Jeralure were raised.Since recovery did I/ot /Iroceed ra/J idly in m hsequent holdillg 01 Ihe rollillg tem/Jerature.dyl/amic recovelY during rolling seemed 10 /Jlay all im/Jorlallt role ill substruelure formatioll .:I ll of Ihese phenomena seemed 10 be compatible with the low stacking fault enCl:tty ~/ this sieel .At a rolling reduction of 33" 0, reclyslalli ;:ation did not occur below 800 "C.Above 900 C, reCIystalliz;atioll was accelerated as the tem/Jerature was eleva led fur lher.The apparent activation energy for grain boundmy migratioll was 84 kcal /g -atom.An emp irical expression was givCII for the acceleration of reClystalli;:ation due to an increase of rolling reduction.