[China Aluminum Network] Precipitation-hardening stainless steel is widely used in aerospace as a key structural component for bearing capacity, heat resistance and corrosion resistance due to its high strength and toughness and low stress concentration sensitivity under dynamic and static loads. . However, in its service environment, precipitation-hardening stainless steels often result in reduced material life due to insufficient wear and corrosion resistance, and must be surface treated to improve material properties. Aluminizing is one of the more effective and practical methods. After the steel is aluminized, the surface can form a dense alumina film, which can greatly improve the wear resistance, corrosion resistance and oxidation resistance of the material. It is widely used in the petrochemical, metallurgy and aviation industries. Since precipitation hardening stainless steels generally have aging temperatures below 600°C, commonly used aluminizing processes such as solid aluminizing and hot dipping aluminizing have higher isotherm temperatures than 600°C, which can lead to changes in the mechanical properties of the matrix material, in order not to change the matrix material. The mechanical properties must be low temperature aluminizing. Physical vapor deposition (PVD) aluminizing process can realize low-temperature aluminizing (aluminizing temperature of about 400°C), but its disadvantages such as poor adhesion of the penetrating layer and expensive equipment restrict its application. Mechanical energy assisted infiltration of aluminum as an effective low-temperature aluminizing process, because it can reduce the temperature of aluminizing and shorten the time of aluminizing, has been valued by many scientific researchers. For the early research of mechanical energy-assisted infiltration of aluminum, most low-carbon steels are used for aluminizing. However, low-temperature aluminizing of stainless steel, especially precipitation-hardened stainless steel, has rarely been reported. In this paper, the mechanically energy-assisted aluminizing process was used to aluminize the precipitation-hardening stainless steel at 500°C. Under the condition that the mechanical properties of the matrix material were basically free from loss, the hardness was twice that of the matrix.
A 1Cr14Ni4Mo3N precipitation hardened stainless steel coupon with <RTIgt;20mm</RTI> 3mm sheet and standard tensile (Φ 5mm), impact (10mm× 10mm× 55mm) was used. The seepage agent used in the experiment was mainly composed of aluminum powder, aluminum iron powder, alumina and ammonium chloride. Prior to the experiment, the specimens were sequentially sanded, alkali washed, pickled, washed, blow dried, and then placed evenly in the drum together with the osmotic agent, sealed and sealed in an RG2-6-6 protective atmosphere rotating furnace. Heated to 500 °C, heat 8 ~ 12h, the furnace cooled to below 300 °C when the percolator out of air cooling, then washed and dried.
By mechanically assisting the infiltration of aluminum, the precipitation hardened stainless steel was annealed at 500° C. for 10 h to obtain an aluminized layer having a thickness of 11 μm. The hardness of the aluminized layer is more than twice that of the matrix. The mechanical energy-assisted aluminizing process does not change the mechanical properties of the matrix material.
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