Quantitative Image Analysis Technique for Determining Local Density Variation

摘要

The PMPA Standards Committee is developing a new test method for determining the porosity of powder metallurgy products by image analysis techniques. This technique would be used to evaluate the local density variation in complex P/M parts. An interlab study was conducted to estimate the uncertainty of this new measurement technique. The results found the accuracy of the test method to be determined by test specimen preparation technique and the image analysis procedure. Such factors as magnification, number of fields examined, field-to-field variability and the detection level setting all had a role in the repeatability and reproducibility of the test method. Results are discussed for both an FC-0208 and 316L stainless steel sample.