Through the application of modern physics concepts, an advanced hydrogen sensor using thermoelectric power (TEP), also known as Seebeck effects, was developed for hydrogen content measurement of face-centered cubic (FCC) alloys, such as UNS N05500. The measured TEP coefficients as a function of hydrogen content developed an anomaly at a specific hydrogen content. Such an indication suggests that phase transformation results with sufficient hydrogen content. The formation of Ni2H phase was found in hydrogen charged UNS N0500 using XRD (X-ray diffraction) and TEM analysis. These results suggest that TEP coefficients determined from a surface contact probe measurement can assist in NDE identification of a microstructural change in UNS N05500 alloys with charging hydrogen content. The correlation of the TEP coefficient to the alloy hydrogen content allows the performance of a nondestructive hydrogen content determination of fabricated structures in service. With the introduction of this advanced TEP coefficient measurement technique, in-situ determination of the susceptibility of an alloy to hydrogen assisted cracking can be performed.

Subject
X-ray diffraction, Hydrogen induced cracking, Correlation, Hydrogen content, Materials performance, Nickel based alloys, Transmission electron microscopy, Hydrogen charging, Hydrides, Reflection, Monel alloys, Titanium alloys, Hydrogen
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2004
Association for Materials Protection and Performance (AMPP)
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