Method for detecting corrosion resistance of stainless steel prepared by selective laser melting

Abstract

The invention discloses a method for detecting corrosion resistance of stainless steel prepared by selective laser melting. The method comprises the following steps: after three-dimensional graphic design of an SLM (selective laser melting) stainless steel product, selecting a plurality of X-Y planes in the Z-axis direction, and adding three cylindrical specimens as a group in each plane, wherein each specimen has the diameter of 10 mm and the height of 5 mm; separating the prepared SLM stainless steel product from the cylindrical specimens, marking a Z-axis numerical value, and polishing and cleaning the cylindrical specimens; performing three performance tests on the three specimens in each group respectively to determine comprehensive corrosion resistance, pitting corrosion resistance and crevice corrosion resistance of the specimens. The corrosion resistance detection specimens and an actual product are prepared from the powdery raw material according to the same process parameters, a detection result is accurate and effective, and the detection process is intuitive; the stainless steel product prepared by selective laser melting is not required to be destroyed, the method is limited by the shape and the size of the actual product, the time can significantly saved, and the manufacturing cost can be significantly saved.

Description

Technical field [0001] The invention belongs to the technical field of material processing, and specifically relates to a method for detecting corrosion resistance of stainless steel prepared by selective laser cladding. Background technique [0002] Selective laser cladding (SLM) is an additive manufacturing technology that uses high-energy-density lasers to melt alloy powders, and is currently an important technology in metal 3D printing. In practical applications, this technology has been successfully used to prepare 304, 316L, 420, 440 and other different grades of stainless steel products. The mechanical properties are equivalent to or better than traditional preparation methods, and it has broad application potential in molds, medical and other fields. [0003] However, the corrosion resistance of stainless steel is an important index to evaluate whether it can be used in production, and the corrosion resistance mainly depends on the unevenness of the material's surface morph...

AI Technical Summary

Problems solved by technology

Considering that the products prepared by SLM are usually small in size, the products are mainly customized, and the production volume is generally a limited number of pieces or even a single piece. Therefore, it is difficult to directly use traditional evaluation methods for SLM products because of high time and economic costs.