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| Analysis on Tensile Fracture With Centerline De-Lamination Defect of Ti-Bearing High Strengthen Steel Strip |
| ZHANG Yun-xiang1,LIU Ping-yuan1,PENG Qi-chun1,WANG Qin1,GUI Zhou2,LI Wei2 |
1. School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
2. Wuhan Iron and Steel Group Company, Wuhan 430080, Hubei, China |
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Abstract Serious centerline de-lamination fractures appeared in hot rolled strip of high-strength structural steel HG70C during tensile test. Specimens under different stress levels were designed for comparison with normal specimen. The formation of centerline cracks of the test specimens was studies by optical microscopy and scanning electron microscopy with energy dispersive spectroscopy. Progressive failure for centerline lamination fracture was analyzed; furthermore the cracking mechanism of de-lamination tensile fracture was described. The results indicated that the pearlite colonies of centerline segregation banding were not the main reason of centerline lamellar fracture. The micro-crack was observed around the inclusions which existed in abundance in the center area. With increasing tensile stress, the micro-cracks coalesced, eventually extended to lamellar cleavage fracture.
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Received: 10 April 2013
Published: 17 April 2014
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2014, Vol. 32 
