SURFACE CHARACTERISTICS INSPECTION METHOD FOR INSPECTING A HEAT TREATMENT FOR STEEL PRODUCTS

To provide a surface characteristics inspection method of inspecting a heat treatment on a steel product subjected to a surface treatment in a nondestructive manner. A surface characteristics inspection apparatus is used which includes an alternating-current bridge circuit, an alternating-current po...

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Bibliographische Detailangaben
1. Verfasser:	MAKINO, Yoshiyasu
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CHEMISTRY GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MEASURING METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PHYSICS TESTING
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Beschreibung
Zusammenfassung:	To provide a surface characteristics inspection method of inspecting a heat treatment on a steel product subjected to a surface treatment in a nondestructive manner. A surface characteristics inspection apparatus is used which includes an alternating-current bridge circuit, an alternating-current power supply that supplies an alternating-current power to the alternating-current bridge circuit, and an evaluation device that evaluates the surface characteristics of a subject, which is a steel product subjected to a heat treatment, based on an output signal of the alternating-current bridge circuit. Coils of a reference detector and an inspection detector in the bridge circuit are energized to produce an alternating-current magnetism to induce an eddy current in a reference subject and the subject, respectively, and the electromagnetic characteristics of the subject obtained in the state where the reference detector detects a reference state is output as a first output signal.