Zairyo-to-Kankyo
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ONLINE ISSN: 1881-9664
PRINT ISSN: 0917-0480

Zairyo-to-Kankyo Vol. 63 (2014), No. 10

  • Aprudent Man Has More Than One String to His Bow

    pp. 513-514

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    DOI:10.3323/jcorr.63.513

  • Application of Micro-indentation Technique to Passive Metal Surfaces

    pp. 515-520

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    DOI:10.3323/jcorr.63.515

    The micro-indentation technique was newly developed for investigating rupture and repair of passive films. The technique was applied to pure iron and aluminum surfaces. The rupture and repair behavior of the passive films was explained. It is clearly shown that rupture of passive films formed on the metal surface is affected by the mechanical properties including film thickness of and stress in the passive film.
  • Susceptibility of SUS304 Steel to Hydrogen Embrittlement in High-pressure Hydrogen Gas at 250°C

    pp. 523-527

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    DOI:10.3323/jcorr.63.523

    The hydrogen embrittlement susceptibility of SUS304 steel in high-pressure hydrogen (H2) gas at 250°C was studied using the slow strain rate testing (SSRT) in high-temperature and high-pressure H2 gas. In high-pressure H2 gas, SUS304 (UNS S30400) steel showed clear susceptibility to embrittlement at room temperature (RT), but very low one at 250°C, that was the same level with SUS316L (UNS S31603) steel at RT. This suggests SUS304 steel would be utilized as a substitute of SUS316L, which has been conventionally used for the equipment or the piping to handle high-pressure H2 gas.
  • Hydrogen Absorption to Low Alloy Steels in High Pressure Gaseous Hydrogen Environments

    pp. 528-534

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    DOI:10.3323/jcorr.63.528

    Effects of test temperature and plastic strain on hydrogen absorption to low alloy steels, and these effects on hydrogen embrittlement were investigated in gaseous hydrogen environments at 45 MPa. At room temperature, hydrogen did not enter into the samples with no strain, while plastic strain in gaseous hydrogen accelerated hydrogen absorption. The amount of absorbed hydrogen increased with an increase in test temperature above 50°C. Slow strain rate tests (SSRT) at room temperature gave more severe results than four point bend tests (4PBT) in gaseous hydrogen at room temperature. This was due to the acceleration of hydrogen absorption by dynamic strain in gaseous hydrogen in SSRT. Cracks hardly occurred in 4PBT after exposure in gaseous hydrogen at 150°C. The mechanism was assumed that degassing of hydrogen from the specimens during cooling or stabilization of hydrogen in the steels at elevated temperatures.

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