Behaviour of Longitudinal Cracks on Slab Surfaces in V‐H Rolling Processes

Yu, Huimin; Li, Xianghua; Ren, Xiao-Jia

doi:10.1002/srin.200806163

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…7 (f) whose fractures distribute along the sample matrix. So, the gap between crack surfaces gradually decreases with increase of the slab deformation, next the crack surfaces get closer and closer until some zones of crack surfaces contact each other, then the contact pressure on crack surface will appear [20,21]. The contacted zone will heal when the contact pressure is larger than a certain value at high temperature, and the long crack is separated into some smaller cracks.…”

Section: Fig 2 Sem Micrograph Of Crack Healing Condition Under Variou...mentioning

confidence: 99%

Research on Crack Healing in Slab during Hot Rolling

Liu

2011

AMR

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The elongation and the strength of rolled steel are severely affected by cracks in production. Reduction of cracks is important for the improvement of slab quality. In this paper, a series of experiments on internal crack healing in slab during rolling was carried out on the experimental rolling mill. The crack shape and the fracture morphology of the crack healing zones were observed by using the scanning electron microscope, and the shear strength of crack healing zone was tested through the tensile testing machine. With increase of the reduction ratio during rolling, the crack healing degree increases.

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Section: Fig 2 Sem Micrograph Of Crack Healing Condition Under Variou...mentioning

confidence: 99%

Research on Crack Healing in Slab during Hot Rolling

Liu

2011

AMR

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“…Filipovic et al (2006) studied opening and closing of artificial V-shaped longitudinal surface cracks in wire rod rolling by experiment and MSC MARC software to eliminate the cracks or minimize their negative influence. Yu et al (2009), Yu et al (2008), Yu et al (2006) and Yu and Liu (2009) simulated the behavior of transversal and longitudinal cracks on the slab surface during the vertical–horizontal rolling process by finite element software LS-DYNA, and the influences of the crack size, crack open-angles, the maximum compressive and tensile stress at crack tip, temperature and contact pressure on crack surface, the edger roll shape, the friction coefficient and the fillet radius of grooved edger roll on the closure and growth of cracks were analyzed. Pesin and Pustovoytov (2015) established three-dimensional (3D) finite element model of edge defects of the hot-rolled plate by rigid-plastic finite element package Deform.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical studies on flow behavior of surface defects in the heavy rail rolling

Pan

Ding

Chang

et al. 2018

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Purpose Surface defects are often present on the surface of continuous casting slabs and rolled products. A lot of surface defects of hot rolled products are inherited from initial defects on continuous casting slabs. This work aims to trace the original surface defect during the whole heavy rail rolling and avoid black line surface defect that appears on the surface of heavy rail finial product. Design/methodology/approach Artificial round hole-shaped surface defects on the surface of continuous casting slab during the hot rolling of 60 kg/m heavy rail are analyzed experimentally and by means of explicit dynamic finite element method (FEM) and modified model rebuilding method. Findings The calculated results of surface defect locations of heavy rail finial product are in good agreement with the experimental ones. It is shown that the explicit dynamic FEM and modified model rebuilding method can be used effectively to predict the flow behavior of surface defects in the hot rolling of 60 kg/m heavy rail. Originality/value The three-dimensional finite element model for whole heavy rail rolling is built using explicit dynamic code and modified model rebuilding method. Flow behavior of black lines is studied in the 60-kg/m heavy rail rolling. The simulation results of six typical points are in good agreement with the experimental results.

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Investigation of closure of internal cracks during rolling by FE model considering crack surface roughness

Lü

Godbole

2014

Int J Adv Manuf Technol

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Investigation of closure of internal cracks during rolling by FE model considering crack surface roughness AbstractInternal cracks often appear in cast slabs, and their evolution during hot deformation directly affects the product quality. In this paper, the authors investigate the closure behavior of internal cracks during plate rolling using a finite element (FE) model that takes into account the roughness of the crack surface. Influences of the roughness and reduction ratio on the closure of cracks are analyzed. The simulated results show that the models with consideration of the initial crack roughness can be used to investigate the formation of residual voids around the crack after rolling. The simulation results are validated by experimental observations. Finally, we propose an explanation of the crack closure mechanism during rolling. Abstract: Internal cracks often appear in cast slabs, and their evolution during hot deformation directly affects the product quality. In this paper, the authors investigate the closure behavior of internal cracks during plate rolling using a Finite Element (FE) model that takes into account the roughness of the crack surface. Influences of the roughness and reduction ratio on the closure of cracks are analyzed. The simulated results show that the models with consideration of the initial crack roughness can be used to investigate the formation of residual voids around the crack after rolling. The simulation results are validated by experimental observations. Finally, we propose an explanation of the crack closure mechanism during rolling.

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Behaviour of Longitudinal Cracks on Slab Surfaces in V‐H Rolling Processes

Cited by 4 publications

References 13 publications

Research on Crack Healing in Slab during Hot Rolling

Research on Crack Healing in Slab during Hot Rolling

Experimental and numerical studies on flow behavior of surface defects in the heavy rail rolling

Investigation of closure of internal cracks during rolling by FE model considering crack surface roughness

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