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| Void-cell model and numerical analysis of evolution regular of void in X80 steel |
| SHI Jing-rui1，QIU Bao-wen1,2，YUAN Ze-xi1，SHEN Dong-dong1 |
（1. The State Key Laboratory of Refractories and Metallurgy， Wuhan University of Science and Technology， Wuhan 430081， Hubei， China
2. Research and Development Center， Wuhan Iron and Steel（Group） Co.， Wuhan 430080， Hubei， China） |
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Abstract Tensile fracture characteristics of X80 pipeline steel with high strength and ductility was observed andanalyzed by SEM and image statistical analysis. The void-cell model was designed in terms of the fracture characteristic parameters and a finite element numerical simulation was used to research the evolution regular of void expansion ratio. The results show that the expansion ratio of void volume caused by the inclusions increased slowly with increasing the equivalent strain under low stress triaxiality condition，and the equivalent strain was proportional to the natural logarithm of the volume expansion ration of the void，so linear relationship was in a good agreement. The holes formed by the secondary nucleation of M-A island leading to ductile fracture should be considered lately under high stress condition. The evolution regular of void expansion ration calculated by finite element numerical simulation was different from traditional[R-][T]model for high stress triaxiality under any loading conditions. The expansion ratio of void volume caused by the inclusions increased rapidly and eventually led to ductile fracture.
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Received: 02 June 2016
Published: 13 January 2017
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2017, Vol. 52 
