<p>Oxide dispersion strengthened (ODS) materials such as iron-based alloy PM2000 possess enhanced mechanical and chemical properties compared to other ferritic alloys. Nonconventional extrusion processes have been evaluated in the fabrication of metallic materials in their different forms such as tubes and sheets. In this work, we used the recently developed shear assisted processing and extrusion (ShAPE<sup>TM</sup>) technique to fabricate an ODS PM2000 tube. Characterization of samples procured from different locations of the extruded tube showed a lowering effect of the crystallographic preferred orientation and residual strain compared to the base metal and dynamic recrystallization and grain growth, especially in the outer diameter of the tube that attributed to the high temperatures associated with the ShAPE<sup>TM</sup> technique. An increase in the size of secondary precipitates of the tube was also observed. Overall microhardness values of the samples showed a Hall-Petch type relationship; that is, lower microhardness for tube locations with large grain and precipitate sizes. These material properties attribute to the unique nature of the ShAPE<sup>TM</sup> technique, and its consistency can be beneficial for particular material engineering designs. While noting that a preliminary investigation into the use of ShAPE<sup>TM</sup> in fabricating Fe-based alloy tubes is reported here, it can be concluded that the technique can be used to fabricate metallic materials with expected properties. However, a more detailed parametric study will be needed to optimize ShAPE<sup>TM</sup> conditions to procure tube samples of the materials.</p>

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Manufacturing of Oxide Dispersion Strengthened Fe-Cr-Al Alloy Using a Nonconventional Extrusion Process

  • Chinthaka M. Silva,
  • Shalini Tripathi,
  • Mageshwari Komarasamy,
  • Julian D. Escobar,
  • Ramprashad Prabhakaran,
  • Quin RS. Miller,
  • Tanvi A. Ajantiwalay,
  • Matthew J. Olszta,
  • Isabella J. Van Rooyen

摘要

Oxide dispersion strengthened (ODS) materials such as iron-based alloy PM2000 possess enhanced mechanical and chemical properties compared to other ferritic alloys. Nonconventional extrusion processes have been evaluated in the fabrication of metallic materials in their different forms such as tubes and sheets. In this work, we used the recently developed shear assisted processing and extrusion (ShAPETM) technique to fabricate an ODS PM2000 tube. Characterization of samples procured from different locations of the extruded tube showed a lowering effect of the crystallographic preferred orientation and residual strain compared to the base metal and dynamic recrystallization and grain growth, especially in the outer diameter of the tube that attributed to the high temperatures associated with the ShAPETM technique. An increase in the size of secondary precipitates of the tube was also observed. Overall microhardness values of the samples showed a Hall-Petch type relationship; that is, lower microhardness for tube locations with large grain and precipitate sizes. These material properties attribute to the unique nature of the ShAPETM technique, and its consistency can be beneficial for particular material engineering designs. While noting that a preliminary investigation into the use of ShAPETM in fabricating Fe-based alloy tubes is reported here, it can be concluded that the technique can be used to fabricate metallic materials with expected properties. However, a more detailed parametric study will be needed to optimize ShAPETM conditions to procure tube samples of the materials.