Ihi Corporation

Minoru Tagami

Hiroaki Hatanaka

Yoshinori Ishida

Kenichiro Watanabe

Arisa Yanagihara

Nobukazu Ido

Katsuya Toda

A method comprises a calibration curve creation step in which a calibration curve is created on the basis of hardened surface layer depth. A destructive test is performed on one of two samples in pairs, and propagation time of a first peak of a first wave of waveform of a signal outputted with the other in pairs in a non-destructive test is determined, the samples in pairs being prepared such that carburization depth varies gradually from pair to pair. A waveform of a signal outputted with a to-be-inspected piece is obtained. The propagation time of a first peak of a first wave of the waveform of the signal output with the to-be-inspected piece is obtained, and the hardened surface layer depth of the to-be-inspected piece is obtained using the calibration curve, on the basis of the propagation time obtained with the to-be-inspected sample.

Method and apparatus for measuring hardened surface layer

An object of the present invention is to quantitatively evaluate a distribution of defects which are generated within an inspection material. In order to achieve this object, the present invention provides a defect inspection apparatus comprising: an ultrasonic wave probe; an ultrasonic wave transmitting and receiving device that irradiates ultrasonic waves via the ultrasonic wave probe onto a surface of an inspection material on which a predetermined propagation medium has been provided, and that also receives as noise signals ultrasonic waves that have been scattered by defects present in the interior of the inspection material; a frequency spectrum calculation device that performs time division on the noise signals so as to divide them into time widths that correspond to positions in the depth direction of the inspection material, and calculates a frequency spectrum for each one of the time-divided noise signals; and a defect distribution detection device that, based on the frequency spectrums, calculates values showing a level of defect progression corresponding to a position in the thickness direction of the inspection material.

Defect inspection apparatus and defect inspection method

A corrosion evaluation device for performing a quantitative evaluation of corrosion by measuring a quantity of decrease in the thickness of a magnetic material which is covered by a non magnetic material or a magnetic material which is not covered by a non magnetic material which includes: a magnetic field generating device for generating such a magnetic field that includes the magnetic material in a magnetic path, a Giant Magnet-Resistive effect (GMR) sensor provided with a GMR sensor for detecting a magnetic flux leakage with regard to the magnetic material and converts a change in the magnetic flux into an electrical signal, a thickness reduction calculation portion for calculating a quantity of decrease in the thickness of the magnetic material based on the electrical signal. The corrosion evaluation device precisely performs a quantitative evaluation of corrosion even when the magnetic material, which is to be evaluated, is covered by a non magnetic material.

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Yokosuka, Japan

Minoru Tagami