Stress and Friction Distribution around Slab Corner in Continuous Casting Mold with Different Corner Structures
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Stress and Friction Distribution around Slab Corner in Continuous Casting Mold with Different Corner Structures SHENG YU, MUJUN LONG, HUABIAO CHEN, DENGFU CHEN, TAO LIU, HUAMEI DUAN, and JUNSHENG CAO The non-uniform friction and thermal stress in the mold are important as causes of the transverse cracks around strand corner. To analyze the stress distribution features around strand corner, a three-dimensional thermo-elastoplastic finite-element mold model with different corner structures (right-angle, big-chamfer, multi-chamfer, and fillet) was established. The temperature field in the mold was indirectly coupled through a three-dimensional fluid flow and heat transfer model. In addition, the non-uniform mold friction stress loaded on the strand surface was calculated through a friction model. The results show that the stress distribution on the shell is similar to the temperature distribution. The stress concentration appears in the strand corner and the lower part of wide face. The friction stress enhances the corner stress around the edge of the air-gap. For chamfered molds, the stress around the corner between the wide face and chamfer face is larger than that between the narrow face and chamfer face. Around the corner region, both the stress peak and the area of the large stress zone of the right-angle strand are the largest, while those of big-chamfered, multi-chamfered, and fillet strands decrease in that order. The stress peak position of the chamfered strands is closer to the mold exit than that of the right-angle strand. Compared with the use of the right-angle mold, the application of chamfered molds is able to reduce the stress concentration around the strand corner. https://doi.org/10.1007/s11663-018-1210-2 Ó The Minerals, Metals & Materials Society and ASM International 2018
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INTRODUCTION
TRANSVERSE corner cracks are one of the important quality problems in slab continuous casting, especially for microalloyed steel. In the mold, the strand is under the complex action of hydrostatic pressure, thermal stress caused by non-uniform temperature, and friction stress caused by slag movement. In general, the fastest heat transfer around strand corner will lead to the lowest temperature, thereby leading to the largest thermal stress. Meanwhile, the poor lubrication condition near the air-gap edge around the strand corner will lead to large friction stress (shear stress). The combined action may lead to transverse corner crack initiation. In recent years, researchers[1] have found that chamfered
SHENG YU, MUJUN LONG, HUABIAO CHEN, DENGFU CHEN, TAO LIU, HUAMEI DUAN, and JUNSHENG CAO are with the Laboratory of Metallurgy and Materials, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, P.R. China. Contact e-mails: [email protected], [email protected] Manuscript submitted July 12, 2017.
METALLURGICAL AND MATERIALS TRANSACTIONS B
molds were able to improve the strand corner temperature and reduce the risk of corner cracks. However, the mold corner structure has a direct effect
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