A model is developed to calculate the composition of reoxidation inclusions that form during pouring of steel castings. The software package Thermo-Calc is used to obtain the inclusion phase fractions and compositions as a function of the temperature and oxygen content of the steel. Oxygen is assumed to be continually absorbed by the steel until the liquidus temperature is reached. Both lever r...

Semisolid processing is one of the modern routes in sound and near net shape parts production.  Preparation of semisolid slurry using a cooling slope is increasingly becoming popular, primarily because of its simplicity in design and ease of control of the process. In this research, the microstructures of Al6061 semisolid alloy cast via a miniature cooling slope were investigated. The propertie...

We propose a control design scheme that aims to prevent undesirable liquid outpouring and suppress sloshing during the forward and backward tilting phases of the pouring process, for the case of liquid containers carried by manipulators. The proposed scheme combines a partial inverse dynamics controller with a PID controller, tuned with the use of a “metaheuristic” search algorithm. The “metahe...

The near net shaped manufacturing ability of squeeze casting process requiresto set the process variable combinations at their optimal levels to obtain both aesthetic appearance and internal soundness of the cast parts. The aesthetic and internal soundness of cast parts deal with surface roughness and tensile strength those can readily put the part in service without the requirement of costly s...

This paper presents an analysis of water modeling of steel pouring to study (1) air entrainment and (2) filter effectiveness to remove reoxidation inclusions. In the first part, a review is presented of the physical processes and parameters important in air entrainment in free-surface flows. Then, the use of a water system to model air entrainment in steel pouring is analyzed. Attention is focu...

BUSINESS-TO-BUSINESS commerce on the Internet is generating a lot of interest. Companies like Ariba, Chemdex, Commerce One, FreeMarkets, Internet Capital Group, and SciQuest.com have attained breathtaking stock market capitalizations. Venture capitalists are pouring money into more B2B start-ups. Even industrial stalwarts like General Motors and Ford have announced plans to set up their own Web...

DESCRIPTION A 65-year-old man presented with bilateral progressive diminution of vision since the past 2 years. He had loss of vision and pain in the right eye since 2 months. He had no history of acute red eye/trauma/surgery. He had visual acuity of perception of light with accurate projection of rays in the right eye. There was white fluffy material pouring from the lens and settling in the a...