Recent research has shown that grain refinement can also be accomplished through intercritical (IC) heat treatment. In those studies, a fine-grained mixture of acicular martensite, or acicular pearlite, in ferrite can be produced by heating to and cooling from a temperature just below the upper critical temperature, as shown in Figures 4a and 4b. Laboratory heat treatment experiments demonstrated that a combination of high strength and high tensile elongation could be achieved by this technique. Zinardi9 reported similar microstructures and mechanical properties for an “IDI” (isothermal ductile iron) alloy using a proprietary heat treatment method.
Speakers: Rick Gundlach
This AFS Members Only Webinar will begin at 1 p.m. CT.