Image Analysis Software for Porosity Measurements in Some Powder Metallurgy Alloys

Abstract

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.

Determination of Porosity in Fluidized-Bed Carburized P/M Compacts Using an Image Software Analysis

“…Image J [23] is a free and useful image analysis software tool to analyse using filters, adjustments and Threshold binary function in detection the porosity. In [24][25][26], Image J was applied to study porosity in sintered P/M specimens. The images acquisition was carried out for non-etched samples using a digital camera coupled to optical microscope.…”

Porosity Measurements and Analysis of Sintered and Thermochemical Heat Treated P/M Compacts

“…With this method, big datasets may be evaluated quickly and automatically, leading to a deeper comprehension of the porosity distribution in the sintered alloy. It also reduces the subjectivity associated with manual approaches by providing accurate and quantitative results [37][38][39].…”