Cobalt Additions to Improve Low-Temperature Toughness of As-Cast Thin Wall Ductile Iron
Materials Science and Engineering Seminar
Ale Almanza, PhD Candidate
Department of Materials Science and Engineering
Michigan Technological University
Abstract: Recently, demand has increased for lightweight materials in the transportation industry to increase fuel economy. Ductile iron is strong, tough, and cost effective, but is usually not considered a lightweight material. In response, the ferrous casting industry has developed Thin Wall Ductile Iron (TWDI). However, at thinner section sizes, carbides are more likely to form during solidification. One way to mitigate carbide formation is to increase silicon, but this is detrimental to toughness by both raising the ductile to brittle transition temperature (DBTT) and lowering the upper shelf energy. Cobalt is known to be a ferrite stabilizer and is hypothesized to mitigate carbide formation while maintaining low-temperature impact toughness. Better understanding the mechanisms and effects of cobalt in TWDI will provide automobile foundries the ability to optimize performance and cost of TWDI castings in markets such as automotive, heavy trucking, and agriculture.
Bio: Ale Almanza earned her bachelor’s degree in Materials Engineering with a specialty in Foundry Processes at Tec Saltillo Mexico. She worked for two years in a Steelmaking, forging, and heat treatment industry as a Metallurgist and Project Engineer. She joined Michigan Tech in the Fall of 2016 to pursue her PhD. Ale loves to volunteer for any MSE event at our department that involves liquid metal, especially if it’s cast iron. In 2018 Ale wrote to research proposals for the Ductile Iron Society and both of them got funded. She did a Summer internship with Aarrowcast in 2018 and worked on ductile iron improvements.
Tuesday, November 12 at 11:00 am to 12:00 pm
Minerals and Materials Engineering Building (M&M), 610
1400 Townsend Drive, Houghton, MI 49931