Cast iron symposium brings 100 to Tokyo.Cast Iron Symposium Brings 100 to Tokyo The 4th International Symposium on the Physical Metallurgy of Cast Iron was held in Tokyo, Sep 4-6, 1989, with nearly 100 engineers and scientists participating. The technical program was comprised of four keynote lectures, plus 35 oral presentations and 45 poster sessions. In the first keynote lecture, "Crystal Growth Theory and Cast Iron Structure," Dr. I. Minkoff, Technion, Israel, reviewed the crystallographic crys·tal·log·ra·phy n. The science of crystal structure and phenomena. crys  tal·log features of graphite, both as a primary phase and as a faceted phase growing with a metallic phase, and related them to growth mechanisms. Dr. Minkoff presented a series of models illustrating the eutectic growth of flake, compact and spherulitic spher·u·lite n. A small, usually spheroidal body consisting of radiating crystals, found in obsidian and other glassy lava rocks. spher structures. Graphite structures were related to their dependence on undercooling and melt chemistry, particularly to the influence of Mg and/or Ce. Professor D. Stefanescu, Univ of Alabama, presented the second keynote lecture, "On the Solidification Kinetics of Spheroidal spheroidal /sphe·roi·dal/ (sfer-oi´d'l) resembling a sphere. spheroidal resembling a sphere. Graphite Cast Iron," a paper coauthored by D. K. Bandyopadhyay. Dr. Stefanescu emphasized the fact that austenite aus·ten·ite n. A nonmagnetic solid solution of ferric carbide or carbon in iron, used in making corrosion-resistant steel. [After Sir William Chandler Roberts-Austen (1843-1902), British metallurgist. dendrites play an important role in the eutectic solidification of ductile iron Ductile iron, also called ductile cast iron or nodular cast iron, is a type of cast iron invented in 1943 by Keith Millis[1]. While most varieties of cast iron are brittle, ductile iron is much more ductile, as the name implies. and that austenite could grow partially independent of graphite. To illustrate these characteristics, a series of directional solidification experiments were conducted and analyzed, with the aid of numerical modeling. "Structure and Property Control of Cast Iron" was the keynote lecture presented by professor Carl R. Loper lope intr.v. loped, lop·ing, lopes To run or ride with a steady, easy gait. n. A steady, easy gait. [Middle English lopen, to leap, from Old Norse , Jr., The Univ of Wisconsin/Madison. The fact was stressed that the graphite morphologies of the various cast irons are not due to separate nucleation nu·cle·a·tion n. 1. The beginning of chemical or physical changes at discrete points in a system, such as the formation of crystals in a liquid. 2. The formation of cell nuclei. events, but are determined by the growth kinetics encountered. Differences in growth can be detected using thermal analysis techniques which present time/temperature data characteristics of the solidification process and reflect results of the combination of nucleation and undercooling experienced at the growth interface. G. Lesoult, Ecole des Mines de Nancy, France, presented the final keynote lecture, "Modeling Solidification of Cast Iron: State of the Art and Usefulness." He reviewed modeling from a number of aspects, including: the microscopic approach of nucleation and growth of solid phases from iron melts; directional solidification and columnar growth; equiaxed solidification; and a macroscopic macroscopic /mac·ro·scop·ic/ (mak?ro-skop´ik) gross (2). mac·ro·scop·ic or mac·ro·scop·i·cal adj. 1. Large enough to be perceived or examined by the unaided eye. 2. approach to the formation of microporosity. Dr. Lesoult then related some concerns regarding present modeling, and proposals for future developments in modeling. The next symposium has been tentatively scheduled for 1994 in France, with a possible one in 1999 in the U.S. Carl R. Lopez, Jr. University of Wisconsin/Madison, WI |
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