Abstract
Powder injection moulding (PIM) is a relatively new process and only a few alloy standards have been recognised. To further promote the application of this technology, new alloys with competitive mechanical properties need to be developed. Fe-1.75Ni-0.5Mo1.5Cu-xC is one of the compositions widely used in the conventional powder metallurgy industry in making press and sinter parts. To benefit from the excellent mechanical properties and the accumulated knowledge of this alloy system, the same composition was employed in this study to make powder injection moulded compacts with the expectation that evenbetter mechanical properties would be attained. The results obtained on the compacts sintered at 1200°C for 1h showed a tensile strength, hardness, and elongation of 685MPa, 91 HRB, and 7 5% respectively. With heat treatment, the tensile strength and hardness increased to 1530MPa and 52 HRC, respectively. However, the elongation decreased to less than 1 0%. These properties are better than those of the press and sinter counterparts owing to higher sintered density, finer grain size, and more homogeneous microstructure.
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