Static-Recrystallization Behavior of E36 High Strength Ball Flat Steel

Static-recrystallization behavior was studied for the E36 high strength ball flat steel on thermal simulator by double pass compression at different temperatures with twice deformation relaxation.The results show that full static-recrystallization occurred quickly in deformed austenite of E36 steel above 900 ℃ within 30-50 s.The recrystallization process slowed down significantly at 900 ℃,and recrystallization volume fraction was less than 50% even if increased the relaxation time to 1 000 s and the recrystallization preparative time increased to 40 s.The recrystallization was very difficult at 850 ℃.The elongated bainite grain of relaxation 4 000 s was less than relaxation 1 000 s because austenite static-recrystallization amount was large,which consisted of homogenous and fine bainite by exquiaxial austenite transition and acerose ferrite along grain boundary.