Parameters Controlling the Oxide Reduction during Sintering of Chromium Prealloyed Steel
Artikel i vetenskaplig tidskrift, 2013

Temperature intervals of oxide reduction processes during sintering of the Fe-3%Cr-0.5% Mo prealloyed powder using continuous monitoring of processing-exhaust gas composition (CO, CO2, and H2O) were identified and interpreted in relation to density (6.5-7.4 g/cm(3)), sintering temperature (1120 and 1200 degrees C), heating and cooling rates (10 and 50 degrees C/min), carbon addition (0.5/0.6/0.8%), type (10% H-2-N-2, N-2), and purity (5.0 and 6.0) of the sintering atmosphere. The progress in reduction processes was evaluated by oxygen and carbon contents in sintered material and fracture strength values as well. Higher sintering temperature (1200 degrees C) and density <7.0 g/cm(3) resulted in a relative decrease of oxygen content by more than 80%. The deterioration of microclimate purity of inner microvolumes of compacts shifted the thermodynamic equilibrium towards oxidation. It resulted in a closing of residual oxides inside interparticle necks. The reducing ability of the N-2 atmosphere can be improved by sintering in a graphite container. High density of 7.4 g/cm(3) achieved by double pressing indicated a negative effect on reduction processes due to restricted replenishment of the microclimate atmosphere with the processing gas. In terms of strength properties, carbon content should not be higher than similar to 0.45%.

PM STEELS

CARBOTHERMAL REDUCTION

POWDERS

ASTALOY CRM

MO

ATMOSPHERES

MANGANESE

COMPACTS

Författare

Monika Hrubovcakova

Institute of Materials Research Slovak Academy of Sciences

Eva Dudrova

Institute of Materials Research Slovak Academy of Sciences

Eduard Hryha

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Margita Kabatova

Institute of Materials Research Slovak Academy of Sciences

Jamila Harvanova

Veterinary University Medicine in Kosice

Advances in Materials Science and Engineering

1687-8434 (ISSN) 1687-8442 (eISSN)

789373

Drivkrafter

Hållbar utveckling

Ämneskategorier

Materialteknik

Styrkeområden

Produktion

DOI

10.1155/2013/789373

Mer information

Skapat

2017-10-07