Numerical Simulation of the Fluid Flow, Heat Transfer, and Solidification During the Twin-Roll Continuous Casting of Ste
- PDF / 2,593,963 Bytes
- 9 Pages / 593.972 x 792 pts Page_size
- 12 Downloads / 227 Views
asting is based on a concept originally proposed by Bessemer,[1] which has the potential to initiate a revolution in the way steel strips are made, delivering impacts no less than the invention of thin-slab casting technology over 20 years ago for the global steel industry.[2,3] Since the introduction of the concept of the twin-roll casting in 1865,[1] there has been little or no change in the underlying process technology owing to the same primary goal of heat extraction from the molten and solidifying metal. However, a half century has passed and the commercialization of twin-roll strip casting for steel is still a dream for engineers, while the first commercialized twin-roll caster for aluminum alloys, the MIANGUANG XU, Ph.D. Candidate, and MIAOYONG ZHU, Professor, are with the School of Materials and Metallurgy, Northeastern University, Shenyang, 110819, P.R. China. Contact e-mail: [email protected] Manuscript submitted on March 21, 2015. Article published online November 12, 2015. 740—VOLUME 47B, FEBRUARY 2016
Hunter Standard Caster, was introduced in the early 1950s by Hunter,[4] using the upward-vertical twin-roll design. At present, twin-roll casting is a popular method of commercially producing thin strips of aluminum and its alloys[2] and has become a standard practice in the aluminum industry, including the downward-vertical twin-roll design[2,3,5] analyzed in the present paper, which is the most typical configuration used in steel twin-roll casting. The commercialization for twin-roll casting of steel and aluminum has different degrees of difficulty which can be attributed to the differences in thermal physical properties between steel and aluminum. The thermal physical properties of steel make the casting of steel strip a complicated task,[6] but no one tells us the differences of the coupled fluid flow, heat transfer, and solidification between the steel twin-roll casting and aluminum twin-roll casting. In addition, the effects of the centrifugal force induced by the counter-rotating rolls have not been described yet, which can influence the heat transfer at the metal/roll interface and the air trap near the meniscus. Today, both of the equipment and the casting techniques have greatly evolved and the steel engineers METALLURGICAL AND MATERIALS TRANSACTIONS B
are expecting to succeed because of the increasing competition in the global steel market and the increasing pressure of environment. In the present paper, we analyze the coupled fluid flow, heat transfer, and solidification in the downward-vertical twin-roll casting for both steel and aluminum, the characteristics of the momentum boundary layer and the solidification front are described, and the wedge-shaped zone and effects of the centrifugal force induced by the rotating roll are analyzed. The evaluation of the solidified shell in the pool for both steel twin-roll casting and aluminum twin-roll casting are compared. The methodology of the finite volume formulation used here is mainly based on the authors’ previous work[7] and the turbulent flow in the pool i
Data Loading...
