Abstract
The influence of the sintering temperature on microstructure and mechanical properties of Fe–2Ni–2Cu alloy processed by metal injection moulding was investigated. For this purpose, sintering treatments were performed at various temperatures ranging from 1100 to 1300°C for 1 h. The micropores of the sintered samples transformed into rounded shapes, and they appeared to be isolated with increasing sintering temperature. The average grain size of the sintered sample seemed to increase slightly as the sintering temperature increased from 1100 to 1200°C, and such a trend altered significantly when the sintering temperature increased from 1200 to 1300°C, whereas the volume fraction of the micropores in the sintered structure decreased with increasing sintering temperature. These results were mainly attributed to the increasing mobility of the grain boundary associated with the sintering temperature. The microhardness value of the sample sintered at 1200°C was higher than those at 1100 and 1300°C, which was due to the fact that two competing microstructural influences associated with the grain size and micropore were balanced at 1200°C.
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