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| Cause of Layered Fracture of Weathering Steel Q450NQR1 During Tensile Test |
| PENG Sheng1,PENG Qi-chun1,FAN Dan-ping1,YANG Jin-ling1,LI Ju-zhong2,LI Wei2 |
1. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
2.Wuhan Iron and Steel Group Corporation, Wuhan 430080, Hubei, China |
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Abstract The inclusion and microstructure in tensile stratified sample of weathering steel Q450NQR1 were studied by means of sulfur print test��metallographic examination, scanning electron microscopy and energy dispersive spectrum analysis to explore the cause of lamination in tensile specimen. The results show that higher segregation of S and Mn exist center of weathering steel Q450NQR1 slab. Nb, Ti and Cr contents are higher in the segregation band than other positions. Serious center segregation favors the appearance of pearlite banded structure, and banded MnS inclusion appears to crack easily in the tensile stress, thus causing the stratification.
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Received: 06 December 2012
Published: 24 February 2014
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2014, Vol. 32 
