Journal
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
Volume 18, Issue -, Pages 83-90Publisher
UNIV FED SAO CARLOS, DEPT ENGENHARIA MATERIALS
DOI: 10.1590/1516-1439.347114
Keywords
Hadfield; manganese; sintering
Categories
Funding
- Brazilian agency Capes
- Brazilian agency CNPq
- Brazilian agency FAPESC
- Brazilian agency BNDES
- company Embraco
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Processing of high manganese austenitic sintered steels present several challenges concerning thermodynamic reactions that occur during the sintering of these materials such as Mn oxidation, sublimation and even the formation of liquid phases or undesired compounds, e.g. grain boundary carbides. Therefore it is extremely important to adjust the sintering parameters to obtain the adequate microstructure and properties. In this work, the effect of some sintering parameters, i.e. temperature, gas atmosphere and cooling rate are studied by dilatometry. The experiments revealed that the sintering temperature has small impact on the microstructure formation. On the other hand, the decrease on oxygen chemical potential in the furnace atmosphere resulted in less oxidation of the powder particles. Moreover, the increasing on the cooling rate to 50 degrees C/min avoided the formation of grain boundary carbides. As a main conclusion, a special sintering cycle for Hadfield steel samples was suggested.
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