Ductile Iron Society Annual Meeting Features Tours, Addresses Pouring, Machinability.The 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. Society held its annual meeting from June 14-16 in Wichita, Kansas
Wichita, also known as the Air Capital of the World, is the largest city in the U.S. state of Kansas, as well as a major aircraft manufacturing hub and cultural center. , attracting 110 attendees from across the U.S. Technical presentations covered topics such as machining of ductile iron, nodularity by thermal analysis Thermal analysis is a branch of materials science where the properties of materials are studied as they change with temperature. Techniques include:
The meeting was concluded with tours of Farrar Corp., Norwich, Kansas, and Grede Foundries, Wichita. In his presentation on automatic pouring of ductile iron, William Pflug, Inductotherm Corp., discussed furnace construction, treatment practices and furnace maintenance. These are the basic criteria that determine the success or failure of an automated ductile iron pouring furnace, he said. According to Pflug, successful ductile iron furnaces were not developed until solutions were found for certain problems, including: high magnesium fade rates, constriction constriction /con·stric·tion/ (kon-strik´shun) 1. a narrowing or compression of a part; a stricture.constric´tive 2. a diminution in range of thinking or feeling, associated with diminished spontaneity. of the receiver and pouring spouts, early power drop and eventual failure of the inductor inductor, electric device consisting of one or more turns of wire and typically having two terminals. An inductor is usually connected into a circuit in order to raise the inductance to a desired value. due to rapid and tenacious slag accumulation, and the inability to maintain pouring accuracy due to the same buildup. Suggestions for base iron treatment included: using a heated pressure-pouring vessel, reducing the presence of air during and after inoculation inoculation, in medicine, introduction of a preparation into the tissues or fluids of the body for the purpose of preventing or curing certain diseases. The preparation is usually a weakened culture of the agent causing the disease, as in vaccination against , introducing silicon or ferro-silicon into the process and reducing the calcium level in the ferro-silicon-magnesium alloy to less than 1%. In his presentation, Charles Bates Bates , Katherine Lee 1859-1929. American educator and writer best known for her poem "America the Beautiful," written in 1893 and revised in 1904 and 1911. , Univ. of Alabama at Birmingham, discussed the machinability of ductile iron. According to Bates, higher speeds increase throughput and minimize the capital and labor costs per part, but machining at higher speeds requires parts with uniform microstructures, consistent properties and a minimum volume fraction of abrasive inclusions. In a study on thin-wall iron casting production conducted at the Univ. of Alabama, Bates found that some of the factors that influence machinability include macro-inclusions, microcarbides, graphite distribution, strength, carbides and carbonitrides, and, to a lesser extent, the cleaning practices used on the casting. Finely distributed carbides that form during solidification of cast iron also have a detrimental effect on machinability, Bates noted. |
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