Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/14366
Title: Microstructural evolution of ferritic steel powder during mechanical alloying with iron oxide
Authors: Wen, Y
Liu, Y
Liu, D
Tang, B
Liu, CT
Keywords: Ferritic steel
Mechanical alloying
Microstructure evolution
Oxide dispersion strengthen
Issue Date: 2011
Publisher: Carl Hanser Verlag
Source: International journal of materials research, 2011, v. 102, no. 2, p. 160-167 How to cite?
Journal: International Journal of Materials Research 
Abstract: Mechanical alloying of mixed powders is of great importance for preparing oxide dispersion strengthened ferritic steels. In this study, the microstructual evolution of ferritic steel powder mixed with TiHx, YH2 and Fe2O3 in the process of mechanical alloying is systematically investigated by using X-ray diffraction analysis, scanning electron microscopy, transmission electron microscopy and microhardness tests. It is found that titanium, yttrium hydrides and iron oxide are completely dissolved during milling, and homogeneous element distribution can be achieved after milling for 12 h. The disintegration of the composite powder particles occurs at 24 h and reaches the balance of welding and fracturing after 36 h. The oxygen content increases sharply with the disintegration of powder particles due to the absorption of oxygen at the solid/gas interface from the milling atmosphere, which is the main source of extra oxygen in the milled powder. Grain refinement down to nanometer level occurs due to the severe plastic deformation of particles; however, the grain size does not change much with further disintegration of particles. The hardness increases with milling time and then becomes stable during further milling. The study indicates that the addition of iron oxide and hydrides may be more beneficial for the dispersion and homogenization of chemical compositions in the powder mixture, thus shortening the mechanical alloying process.
URI: http://hdl.handle.net/10397/14366
DOI: 10.3139/146.110462
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