Abstract
The quantitative analysis of the casting porosity did not progress well compared with that of the mechanical properties.The quantitative analysis of the casting porosity of Au-Pd-Ag-Cu alloy was reported in the preceding paper.In this paper, the casting porosity of Ag-Pd-Cu alloy was analized.The polished specimens which were subdivided into equal sized pieces from the castings, were examined by use of the image analysis system connected to a metallurgical microscope.The size and the form of each porosity, and the distribution of porosities were measured.The main results were summarized as follows:The porosity ratio was influenced by the distance from a sprue.The difference between the porosity ratio of the central part and that of the marginal part was influenced by the casting process.There was a definite correlation between the porosity ratio and the maximum area of the porosity.The lower positive tangent count of the porosity was useful to determine the form of the porosity.There was a definite difference between the porosities of Au-Pd-Ag-Cu alloy and that of Ag-Pd-Cu alloy.From the facts described above, it was clear that the image analysis system was very useful to quantitatively determine the casting porosity.
