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《Iron & Steel》 2017-12
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Inspection and analysis on flakes defect of ferrite steel

LI Ji-dong;REN Yong-xiu;Technology Center,Shanxi Taigang Stainless Steel Co.,Ltd.;  
Suspect flakes defects in ferrite steel were analysed by OM and SEM. The results showed that the suspect defects appeared zigzag crack,which is the characteristic of flake crack. According to fracture analysis,at macro fracture of low carbon ferrite steel was distributed silver grey and round spot,which is the characteristic of flake defect,and there was no flakes defect characteristics at macro fracture of ferrite stainless steel. However,the fractographic of suspect flakes of ferrite stainless steel was intergranular fracture and cleavage fracture as the source of inclusions,which two are characteristics of hydrogen fracture. In conclusion,the suspect flakes defects in two ferrite steel were all flakes defect.The morphology features of flakes defect in ferrite stainless steel was different from normal flakes defect such as clouds,rippled wall,clavage feathers,microporosity and so on,and the morphology of flakes defect in different samples of ferrite stainless steel were different. One was intergranular fracture,the other was cleavage fracture as the source of inclusions.
【CateGory Index】: TG142.15
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