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

Abstract

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.

Micropore Evolution and Damage Behavior of Rapid‐Solidified Al–Zn–Mg–Cu Alloy during Hot Plastic Forming

“…Meanwhile, Chen [ 20 ] revealed internal micropore evolution mechanisms based on a nonlinear finite element model. Furthermore, Yu [ 21 ] reported crack closure and micropore formation during the rolling process using the finite element method and proposed a related closure criterion for cracks. As reported, there have been abundant research achievements in plastic forming theory and simulation techniques of rapidly solidified porous alloys.…”

Effect of Deformation Parameters on Microstructure and Mechanical Properties of Internal Crack Healing in As‐Cast 30Cr2Ni4MoV Steel

“…At present, the physical simulation and numerical simulation were mainly used in the research of internal crack healing [5,6]. Scholars have studied the evolution process of internal cracks from the perspectives of healing mechanism [7], healing methods [8], healing influencing factors [9], and establishment of determination methods [10].…”

Effect of Parameters on Internal Crack Healing in 30Cr2Ni4MoV Steel for 600-Ton Ultra-Super Ingots

“…Griffith [5] proposed that cracking was not reversible, but a very narrow crack could be healed by a heat treatment method if the temperature was sufficient to bring the atoms on either side of the crack within mutual range by thermal agitation. Compared with crack propagation, crack healing in metallic materials [6][7][8][9] have been studied for only two decades. This kind of investigation is still in the early stage.…”