The work aims to investigate the effect of mechanical pressure on the microstructure and property evolution of pre-alloyed powder sintered blocks during the hot-pressing process to optimize the performance of Fe-based alloy matrix. By vacuum hot pressing, FeCu30 alloy block was prepared with FeCu30 pre-alloyed powder under three different sintering pressures (18, 25, and 32 MPa). The microstructure, phase composition, compressive strength, and wear resistance of the FeCu30 alloys were analyzed through X-ray diffractometer (XRD), confocal microscope, scanning electron microscope, tensile machine, and tribological testing machine, respectively. The FeCu30 alloys exhibited a homogeneous structure consisting of Cu-rich and Fe-rich matrix phases under all sintering pressures. As the sintering pressure increased, the number of pores increased, but the size distribution range became narrower. The average pore sizes were 2.57 μm to 1.82 μm and 1.37 μm, respectively. The relative densities increased significantly, reaching 97.5%, 99.3%, and 99.7% , the Vickers hardness values were 210.7HV0.5, 229.4HV0.5 and 237.0HV0.5, respectively, the compressive strength values were 706.0 MPa, 671.4 MPa and 607.7 MPa, respectively, the yield limits were 473.6 MPa, 469.2 MPa and 492.0 MPa respectively and the average friction coefficients were 0.79, 0.74 and 0.73, respectively. With the increase of sintering pressure (18, 25, 32 MPa), the density and hardness of the material continuously increase, while the compressive strength gradually decreases. The yield limit first decreases and then increases, yet the wear resistance progressively improves.
Key words
sintering pressure /
FeCu30 /
property /
compressive strength /
friction and wear
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Funding
National Natural Science Foundation of China (52201044); Key Specialized Research & Development and Promotion Project of Henan Province (262102230043); Natural Science Foundation of Henan Province (212300410213); Industry-University-Research Innovation Fund for Mechanical Students of Nanyang Institute of Technology (JXCXY-A250103)
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