Abstract
In order to produce high manganese steel by the powder metallurgical process, three kinds of Mn-containing powder, that is, electrolytic manganese powder, Fe-Mn alloy powder and Fe-Mn-C alloy powder were mixed with atomized iron powder together with graphite powder respectively, so as to make up alloys having chemical composition of 13% manganese and 1.18 or 1.30% carbon. These three kinds of mixed powder were compacted and sintered in hydrogen containing 0.3 vol% propane gas under the condition of experimented sintering temperature and time. The sintering behaviour of these powder mixes was investigated. The oxygen content and mechanical properties of sintered steels were examined. Experimental results indicated that the use of Fe-Mn-C alloy powder made it possible to obtain the sintered high manganese steels having lower oxygen content and more homogeneous structure at relatively low sintering temperature. The reason for this can be attributed to resistant characteristic of Fe-Mn-C alloy powder against oxidation and the formation of a liquid phase during sintering. It was concluded that the Fe-Mn-C alloy powders whose composition corresponds to those of commercial high carbon ferromanganese materials are considerably useful for the production of the sintered high manganese steel by powder metallurgical process.The mechanical properties of these sintered steels are markedly improved with densification. The sinter-forging process is an effective and promissing process for the densification of these sintered steels.
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