ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The removal of oxygen during sintering by carbothermic reduction and the resultingcarbon loss were studied for steel compacts prepared with the compositions Fe-3%Cr-0.5%Mo-0.5%C and Fe-1.5%Mo-0.5%C, respectively, prepared from prealloyed powders. The compactswere prepared by pressing at 600 and 1000 MPa, and sintering was done at 1100 and 1300°C invacuum. It showed that for the Cr-Mo steel, deoxidation strongly depends on the sinteringtemperature, in contrast to the plain Mo steel; at 1300°C very low oxygen levels were measuredwith the standard density compact while after pressing at 1000 MPa, still significant oxygen iscontained, which is in agreement with the lower carbon loss measured. This indicates inhibition offinal deoxidation by pore closure; nevertheless, the impact energy was very high and exceeded thatof the Mo alloyed steels, indicating that finely dispersed oxides within the matrix are irrelevant ifonly the surface oxides have been completely removed
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.577.pdf
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