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Microstructure and impact fracture behavior of simulated HAZ of F500 steel

YUE Chong-xiang,CHEN Huan-de,BAI Xiao-hong,LIU Dong-sheng(Institute of Research of Iron and Steel,Shasteel,Zhangjiagang 215625,China)  
Single welding thermal cycles with different heat inputs(E) of an advanced F500 thick plate steel were simulated by employing a Gleeble 3800 thermomechanical simulator.Effect of E on microstructure of heat affect zone(HAZ) was characterized by means of OM,SEM and EBSD,and mechanical properties were measured.When E is lower than 30 kJ/cm,the microstructure of the HAZ consists of mainly lath-like bainite(LB) with high angle grain boundaries(HAGB) between the laths resulting in higher impact toughness at-60 ℃.With the increase of E,the microstructure consists of dominating granular bainite(GB)+LB with decreased fraction of HAGB resulting in lower impact toughness at-60 ℃.When E is lower than 50 kJ/cm,the impact fracture process can be divided into crack formation,stable propagation,unstable propagation and final fracture stages.When E is greater than 100 kJ/cm,the microstructure of HAZ consists of mainly GB.Brittle crack dominates the entire course of fracture,as a result,the toughness of HAZ is significantly worsened.
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