Method for improving wear resistance of surface of iron-based powder metallurgy product by electron beam remelting
An iron-based powder metallurgy and electron beam remelting technology, applied in the field of powder metallurgy, can solve the problems of insufficient surface mechanical properties of iron-based powder metallurgy products, and achieve the effects of small deformation of the workpiece, small heat input, and small thermal influence.
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Embodiment 1
[0026] First, the metal powder is formed by 23T pressure, and then sent to the mesh belt type sintering iron furnace for sintering. It is kept at 1000°C and 1080°C for 6 minutes, and at 1120°C for 30 minutes, and then slowly cooled in the furnace. During the sintering process, the furnace Into the hydrogen, prepared into iron-based powder metallurgy products.
Embodiment 2
[0028] First, the metal powder is formed by 23T pressure, and then sent to the mesh belt type sintering iron furnace for sintering. It is kept at 1000°C and 1080°C for 6 minutes, and at 1120°C for 30 minutes, and then slowly cooled in the furnace. During the sintering process, the furnace Hydrogen is introduced into the medium to prepare iron-based powder metallurgy products.
[0029] Fix the sintered powder metallurgy product on the workbench, seal the molding cavity and pump it to a high vacuum state; then use an electron beam with a current of 8mA to scan the surface of the sample with a voltage of 60kV, a scanning speed of 10mm / s, and maintain a heat output of 3J / mm , and then cut out a small middle part for inlaying, so as to observe the change of its cross-sectional properties later.
Embodiment 3
[0031] The difference between this embodiment and Embodiment 2 is that a 9 mA electron beam is used, and the voltage, scanning speed, and heat output of the electron beam remain unchanged.
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