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《Physical Testing and Chemical Analysis(Part A:Physical Testing)》 2011-01
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Formation Cause Analysis on Cold Bending Cracks in Q235B Steel Plate

ZHONG Zhen-qian,ZHU Yan-yong,YANG Chun,DONG Yi,HE Xi-kou (Central Iron and Steel Research Institute,Beijing 100081,China)  
A Q235B steel plate with thickness of 8 mm was bent more than 90° during room temperature plastic deformation process,and cracks initiated in the inboard and propagated to the outboard of the steel plate at the bending corner when bent back.In order to find the reason for cracks occurring,fracture surface observation,mechanical properties test,metallographic examination,micro-hardness test and EBSD analysis had been done.The results indicated that the over length inclusions in the steel plate,bad ductility reflected by the impacting value,the working hardening and crystal change induced by the normal bending,worsened the mechanical properties of the bending corner of the steel plate and caused it to crack with the formation of cleavage during the contrary flexure.
【CateGory Index】: TG142.15
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