Abstract
In this article, the results of preliminary experimental studies related to a fast, non-contact assessment of the AISI 316L stainless austenitic steel surfaces after electrochemical polishing in a magnetic field have been presented. The experiments were realized with the use of a modified angle-resolved scattering (ARS) method based on the analysis of angular distribution of the scattered light intensity. Digital images of such distribution were acquired for selected areas of examined samples—base surface and surface after magnetoelectropolishing (MEP) process. Parametric analysis oriented toward the calculation of selected key geo- and photometric parameters carried out in Image Pro®-Plus software allowed for characterization of the surface conditions of the assessed samples in terms of their scattering properties. The obtained experimental results confirmed the usefulness of the ARS method used in the presented studies as well as the possibility of its practical use (after appropriate modifications) on a wider scale, especially in industrial applications.
Highlights
At the beginning of the twentieth century, the production of austenitic stainless steels for application in the chemical, energy and food industries was introduced
The polished surface after the MEP process is characterized by relatively high anisotropy
The above forms can be visually supplemented with additional angular distribution(s) of scattered light intensity resulting from the occurrence of various types of defects on the analyzed surface
Summary
At the beginning of the twentieth century, the production of austenitic stainless steels for application in the chemical, energy and food industries was introduced. It has to be pointed out that the addition of nickel (8–23%) and/or copper (0.2–0.75%) and/or manganese (0.3–4%) is necessary to obtain the austenite structure. Other elements, such as carbon (0.02–0.08%), chromium (17–28%), molybdenum (2–8%) and nitrogen (0.1–0.6%), have a significant influence on both the mechanical properties and the corrosion resistance. The yield (170–500 MPa) and tensile (214–795 MPa) strengths are obtained mainly by addition of carbon and nitrogen [1]. They cannot be hardened by heat treatment, so they are cold-worked by forming, spinning and swaging, which increase their strength. Electrochemical polishing processes are used to reduce the surface roughness as well as to form on the top of surface the chromium enriched nano-layer, which has better corrosion resistance than the air-oxidized matrix [2,3]
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