Abstract
Fe-2Cu-2Mo-0.8C powder mixtures were prepared by mixing Fe, Cu and C elemental powders with different forms of Mo-containing powder (pure Mo powder, prealloyed Mo-Fe powder and mechanically alloyed Mo-Fe powder, respectively). The powder mixtures were warm pressed under different pressures and temperatures. Properties of the green compacts and the sintered parts were tested to investigate the effects of the different ways of introducing molybdenum. The test results show that a green density of 7.32 g/cm3 was obtained for Fe-2Cu-2Mo-0.8C powder mixtures containing mechanically alloyed Mo-Fe powders, under a warm compaction pressure of 800 MPa and warm pressing temperature of 120 °C, respectively. The sintered Fe-2Cu-2Mo-0.8C specimens added with mechanically alloyed Mo-Fe powders had a density of 7.31 g/cm3, a hardness of 95 HRB and a tensile strength of 618 MPa, respectively. Compared with the sintered samples, added Mo in the forms of pure Mo and prealloyed Mo-Fe powder, the sintered parts added with mechanically alloyed Mo-Fe powders had more uniform microstructure, better mechanical and wear-resistant properties.
Highlights
Ferrous powder metallurgy (PM) parts are widely used in automotive, machinery, appliances, military and many other applications [1]
Iron-copper-carbon (Fe-Cu-C) alloy is the most widely used ferrous material, which possesses more than 50% in the sintered ferrous PM parts
To further improve the properties of Fe-Cu-C PM parts, Mo has been extensively investigated as an alloying element because of its excellent solution strengthening ability, which can refine the grain size of the pearlite compared with other alloying elements, such as Mn, Ni, and Cr [5,6]
Summary
Ferrous powder metallurgy (PM) parts are widely used in automotive, machinery, appliances, military and many other applications [1]. With the developments of advanced manufacturing, there is an emerging need for ferrous powder metallurgy parts with high performance [2,3]. Iron-copper-carbon (Fe-Cu-C) alloy is the most widely used ferrous material, which possesses more than 50% in the sintered ferrous PM parts. Ferrous parts containing about 2–5 wt.% of copper and. 0.6–1 wt.% of carbon are commonly used in automotive applications (e.g., valve seat rings and guides, shaft sleeves, lifter parts, pump gears, etc.) [4]. To further improve the properties of Fe-Cu-C PM parts, Mo has been extensively investigated as an alloying element because of its excellent solution strengthening ability, which can refine the grain size of the pearlite compared with other alloying elements, such as Mn, Ni, and Cr [5,6].
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