A method for evaluating a crack in a metal member comprises a first removal step (S10) and a second removal step (S20). In the first removal step (S10), a step for electrolyzing a metal member having an oxide scale formed on a surface thereof, a step for acquiring an image of the oxide scale as a first image, and a step for determining whether or not a scale crack has occurred are repeated until occurrence of a scale crack is determined. In the second removal step (S20), a step for electrolyzing the metal member having the scale crack, a second image acquisition step for acquiring an image of the oxide scale as a second image, and a second determination step for determining whether or not the scale crack has disappeared are repeated until disappearance of the oxide scale is determined.

A corrosion monitoring device includes: a sensor unit that includes an insulating substrate, a stainless steel plate disposed on the insulating substrate and is configured of stainless steel, an aluminum piece joined to the stainless steel plate and configured of aluminum having a lower corrosion potential than the stainless steel and smaller electrical resistivity than the stainless steel, and extraction electrodes coupled to the stainless steel plate; and an ohm meter that measures an electrical resistance of the sensor unit when a current flows in the sensor unit.

A corrosion monitoring device includes: a sensor unit that includes an insulating substrate, a stainless steel plate disposed on the insulating substrate and is configured of stainless steel, an aluminum piece joined to the stainless steel plate and configured of aluminum having a lower corrosion potential than the stainless steel and smaller electrical resistivity than the stainless steel, and extraction electrodes coupled to the stainless steel plate; and an ohm meter that measures an electrical resistance of the sensor unit when a current flows in the sensor unit.

Provided is a sheet inspection device capable of saving space, reducing member costs, and reducing the number of maintenance steps. A first light source Ls1 and a first inspection part S1 for inspecting a flaw on the front surface of a sheet and a second light source Ls2 and a second inspection part S2 for inspecting a flaw on the back surface of the sheet are disposed in such a positional relationship that when the sheet has a hole, the first inspection part S1 can detect light emitted by the second light source and transmitted through the hole in the sheet.

Provided is a sheet inspection device capable of saving space, reducing member costs, and reducing the number of maintenance steps. A first light source Ls1 and a first inspection part S1 for inspecting a flaw on the front surface of a sheet and a second light source Ls2 and a second inspection part S2 for inspecting a flaw on the back surface of the sheet are disposed in such a positional relationship that when the sheet has a hole, the first inspection part S1 can detect light emitted by the second light source and transmitted through the hole in the sheet.

An approach to determining the crash dynamic behavior of structural castings made of a AlSi10MnMg alloy in a simple and cost-effective manner is provided. In this approach eddy current testing is carried out using a high-resolution measuring coil which is adjusted to the cast-specific conductivity.

A digital precious metal testing apparatus utilizes a test pen probe having therewithin a titanium wire that generates a galvanic voltage when an electrical circuit is completed with the object being tested between the pen probe and the meter test pad. A calibration system is provided to enhance the accuracy of the testing apparatus by comparing a test reading from a known test specimen with a corresponding theoretical reading for that specimen, and generating a recalibration curve from which all subsequent readings will be compared to determine the content of precious or non-precious metal being tested. The titanium wire test pen probe generates a greater galvanic charge compared to conventional platinum wire pen probes, which enables the test pen to be used to distinguish grades of non-precious metals, such as distinguishing grade 304 stainless steel from grade 316 stainless steel, for use in the recycling industry.

A digital precious metal testing apparatus utilizes a test pen probe having therewithin a titanium wire that generates a galvanic voltage when an electrical circuit is completed with the object being tested between the pen probe and the meter test pad. A calibration system is provided to enhance the accuracy of the testing apparatus by comparing a test reading from a known test specimen with a corresponding theoretical reading for that specimen, and generating a recalibration curve from which all subsequent readings will be compared to determine the content of precious or non-precious metal being tested. The titanium wire test pen probe generates a greater galvanic charge compared to conventional platinum wire pen probes, which enables the test pen to be used to distinguish grades of non-precious metals, such as distinguishing grade 304 stainless steel from grade 316 stainless steel, for use in the recycling industry.

Methods and devices are disclosed for tracking site-specific microstructure evolutions and local mechanical fields in metallic samples deformed along biaxial strain paths. The method is based on interrupted bulge tests carried out with a custom sample holder adapted for SEM-based analytical measurements. Embodiments include elliptical dies used to generate proportional and complex strain paths in material samples. One example holding device includes a base having a floor and walls that extend to form a chamber for a sample, the floor having apertures for receiving a pressure-supplying fluid, a cover having an opening and configured such that the cover and base can be coupled together to tightly clamp a sample in the chamber, and washers disposed between the base and the cover, each washer having openings extending therethrough change at least one of a shape and a size of the opening formed in the cover.

There is provided a method for predicting the amount of corrosion in a steel including a step in which, based on a weather observation value W.sub.M at a scheduled use point M of the steel, a corrosion index Q(t.sub.Mi, W.sub.M) is obtained for each past observation time t.sub.Mi, extremal value statistical analysis is performed on time-series data of the corrosion index Q(t.sub.Mi, W.sub.M) between observation times t.sub.M1 to t.sub.Mn, and a maximal value Q.sub.max(t.sub.Fi) of the corrosion index within future evaluation periods t.sub.F1 to t.sub.Fn is estimated, and a corrosion amount estimation step in which a relational expression between a measured corrosion amount obtained in a corrosion test at a test point Z and the maximum value of a corrosion index Q(t.sub.Zi, W.sub.Z) obtained for each observation time t.sub.Zi during a test period of the corrosion test based on a weather observation value W.sub.Z at the test point Z is obtained in advance, the maximal value Q.sub.max(t.sub.Fi) of the corrosion index estimated above is introduced into the relational expression, and an estimated value of the amount of corrosion in the steel during the estimated period is obtained.