Distinction of Alloy Steels by Means of the Closely Coupled Probes Potential Drop Technique

摘要

A method using more sensitive closely coupled probes for d-c potential droptechnique is applied to distinction of alloy steels. The probes aresynthesized to build a small sensor. Some alloy steels, which are differentfrom each other in chemical composition, are tested in experiment. A simpleequation of the potential drop for an uncracked plate is obtained. Using theequation, the electrical resistivity of the materials is calculated. It isfound through multivariate analysis that the resistivity of the alloy steelscorrelates well with their chemical composition. As a result, it is verifiedthat the closely coupled probes potential drop technique is useful for theevaluation of resistivity in a moment and the distinction of alloy steels.