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Processing Conditions And Reduction Of Oxides During Sintering Of Chromium Pre-Alloyed Steel

Monica Hrubcakova ; Eva Dudrova ; Eduard Hryha (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Margita Kabatova
Powder Metallurgy Progress (1335-8987). Vol. 12 (2012), 3, p. 144-158.
[Artikel, refereegranskad vetenskaplig]

Oxide reduction processes and their temperature intervals during sintering of Fe-3Cr-0.5Mo pre-alloyed powder have been identified using continuous monitoring of processing gas composition (CO, CO2, H2O). Their interpretation is in relation to density (6.5-7.4 g·cm-3), sintering temperature (1120 and 1200°C), heating and cooling rates (10 and 50°C/min), carbon addition (0.5/0.6/0.8%), and type of sintering atmosphere (10%H2-N2, N2), respectively. The progress in reduction processes was evaluated by the relative change in oxygen and carbon contents and related to resultant fracture strength. Higher sintering temperature (1200°C) and low density (6.5 g·cm-3) result in a relative decrease of oxygen content by more than 80%. Higher cooling rate (50°C/min) eliminates re-oxidation during cooling. The reducing ability of the nitrogen atmosphere can be improved by sintering in a graphite container. High density of 7.4 g·cm-3, achieved by a pressing/re-pressing method, causes a slowing down of the reduction processes. In terms of optimizing strength, the carbon content in this sintered steel should not be higher than ~0.45%.

Nyckelord: chromium pre-alloyed steel, sintering, oxide reduction, processing gas composition



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Denna post skapades 2013-12-03.
CPL Pubid: 188229