Article ID: ISIJINT-2021-542
The low mechanical properties of porous materials are a common problem. It is of great significance to produce new porous metal materials with higher impact properties by new preparation process. In this work, a new stainless steel metal powder and wire mesh composite porous plate was prepared by vertical rolling, folding, pressing and sintering. Most importantly, a device, with ultrasonic generator, could generate porous strip, was invented innovatively to feed powder and wire mesh automatically for applying in the first step of the preparation process. The porous strip that used to prepare porous plate had the unique characteristic of a powder-wire mesh-powder sandwich structure. The impact behavior and microstructure were comparatively investigated. The fracture morphologies were observed to determine the fracture mechanisms. The results manifested that sintering temperature had the outstanding influence on the impact properties and fracture morphologies, higher temperature got stronger impact properties. Wedge fracture, cone fracture and circular fracture were main type of fractured warp wire when porous plate was sintered at 1130°C. Quicker ultrasonic frequency, gave little change in fractographs, but brought lower porosity and excellent impact properties, which due to more powder participate in preparation. The gap between two rollers determined combined degree between powder and wire mesh then led to various impact strength, and diameter of the necking with roller gap of 0 mm was less than 0.1 mm.
