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Meeting Materials Science & Technology 2017
Symposium Fifty Years of Metallography and Materials Characterization
Presentation Title A Metallographic Study on the Diffusion Behavior and Microstructural Transformations in Silicon-containing Powder Metallurgy Steels
Author(s) Thomas F. Murphy, Christopher Schade
On-Site Speaker (Planned) Thomas F. Murphy
Abstract Scope The choice of alloying method for powder metallurgy alloys is often dictated by the oxidation potential of the alloying elements used in powder manufacture. Silicon is effective in improving properties of ferrous PM steels. However, if added to the melt prior to atomization, the likelihood of oxidation is high. Alternatively, Si-rich and more complex particulates can be combined with the base powder, i.e., iron or low-alloy steel, with alloying occurring by diffusion during sintering. The effectiveness of these additives is dependent on their distribution throughout the material volume, as determined by diffusion of each added element. In this study, the distribution of silicon was quantified using energy dispersive spectroscopy on several alloy compositions. These data were compared with the volume fraction of various transformation products in cross-sections of hardenability samples using both light and electron microscopy. Predictions on the effects of local chemical composition, cooling rate, and microstructure are made.
Proceedings Inclusion? Planned: Publication outside of MS&T


A Metallographic Study on the Diffusion Behavior and Microstructural Transformations in Silicon-containing Powder Metallurgy Steels
Advanced Analytical Microscopy: Metallographic Characterization for the Next Fifty Years
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