Hydrogen Distribution Permeated through a Duplex Stainless Steel Detected by Hydrogen Microprint Technique

Effect of Strain Rates on Mechanical Properties of a Duplex Stainless-Steel Sheet Charged in Hydrogen Plasma

“…In aluminum, it has been reported that larger amount of hydrogen can be charged using plasma hydrogen charging method than using electrolytical hydrogen charging. 22) In this study, the experimental procedures will be approximately the same as in the authors study carried out before 21,[23][24][25] but charging method will be changed to plasma hydrogen charging. It will be expected that the amount of charged hydrogen will be increased by changing the method, leading to the more marked tendency of HE, which then will help us reveal the mechanism of HE, since it is generally accepted that the higher the concentration of hydrogen, the larger the effects of hydrogen.…”

“…The material used in this study is the JIS SUS329J4L sheet with 1 mm thickness, annealed at 1 050°C for 1 min and then water-cooled, which is exactly the same as used in our previous papers. 21,[23][24][25] According to the latest phase map data taken by electron back scattering diffraction, 25) phase fraction (austenite to ferrite) was 0.536 to 0.444 by ignoring the fraction of undefined area. Tensile test pieces with gage length of 12 mm and width of 5 mm were cut from the 1 mm-thick sheet, so that the tensile direction is parallel to the rolling direction.…”

Visualization of Hydrogen and Hydrogen-induced Defects in Tensile-deformed Pure Iron Using Hydrogen Microprint and Tritium Autoradiography

“…The previous HMT studies on steels [15][16][17][18] focused mainly on the hydrogen diffusion path and trapping site related to second gamma and inclusion phases without straining, where the detection side was opposite to the hydrogen entry side (opposite-side HMT). Under this configuration, Nagao et al 19) investigated the effect of plastic strain up to 20% in a 0.005%C steel.…”

“…Under this configuration, Nagao et al 19) investigated the effect of plastic strain up to 20% in a 0.005%C steel. Ghorani et al investigated the effect of incubation period at room temperature between hydrogen charging and emulsion covering in a duplex stainless steel under the same configuration 20) as well as that where the detection side was the same as the hydrogen entry side (same-side HMT) 18) . No work seems to have been made on pure iron or ferritic steel under the same-side HMT condition and on the effect of incubation period.…”