The properties of materials are identified as the results of its microstructures characteristics. Consequently the task of analysis of microstructure is very important in engineering. There are several methods such as the visual inspection and the semi-automatic inspection by image analysis. Visual inspection by an operator is subject to human error and can take important time. The semiautomatic method using specific algorithm and technique improves performance of the work, however still needs specific knowledge concerning image filters and image analysis technique. This research’s objectives are to present automatic image analysis algorithm to measure grains in microstructure images.
The present research was aimed to study the porosity in some powder metallurgy (P/M) alloys using an image analysis software. The porosity in P/M parts is an important parameter because is affecting the mechanical properties. Also, porosity is in correlation with processing parameters such as green density, alloying elements, particle size. The conventional method for porosity measurements of powder metallurgy products is using the density technique. Another method for porosity measurements was using an image processing software and by applying filters and adjustments the detection of the pores (black areas) was done. Two types of powders obtained by water amotization were subjected to analyze. To obtain the green compacts, the powders were pressed at 600 MPa using a single die action. The green compacts were sintered in a laboratory furnace at 1150o C for 30 and 120 minutes. A metallographic analysis was performed for porosity measurements. The pore’s shape and porosity fraction were measured using both conventional and image analysis techniques. The porosity measurements for sitnered specimens obtained from image analysis was slightly higher than that from density technique.
The alloying of the zinc with some additional elements in specific quantities could be reliably used in the hot-dip coating process. These elements form specific intermetallic compounds that conferred substantially improved performance to the end-product specially by improving of the corrosion resistance. The paper presents the research that has developed to analyze the influence of aluminum, bismuth and tin like alloying elements added in the zinc on corrosion resistance of galvanized steels. Steel samples were galvanized by the hot-dip method in micro-alloyed zinc baths. The influence of the alloying elements on the formation of the different phases and on the diffusion process is discussed. The corrosion experiments were carried out in a simulated environment of accelerated corrosion conditions. The kinetics and the mechanism of corrosion of the samples were studied in correlation with the effect of alloying elements on nature and characteristics of protective layers.
In this paper is describe the influence of the deformation degree on the mechanical properties and microstrucure of the blanks obtained by tube and wire drawing. The materials used for this study are represented by two different samples: hot rolled wire rod and wire for concrete reinforcement with periodic profile (drawn wire) with three dimensions of obtained diameter ( d1 = 5.00 mm, d2= 4 mm and d3= 3,5 mm). The results reveal that the strength properties of the samples are increasing with an increase in the degree of deformation, while the plasticity properties are lowering.The purpose of this paper is to evidence the changes in the structure, the strength and plasticity properties depending on the deformation degree and section reducing of the metallic material.
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