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http://dx.doi.org/10.5695/JKISE.2013.46.5.229

An Analysis of Small Punch Test Conducted with the High Strength Dual Phase Sheet Steels Charged with Hydrogen  

Choi, Young-Cheul (Dept. of Materials Science & Engineering, Graduate School of Industry & Engineering, Seoul National University of Science & Technology)
Park, Jae-Woo (Dept. of New Energy Engineering, Graduate School of Energy & Environment, Seoul National University of Science & Technology)
Kang, Kae-Myung (Dept. of Materials Science & Engineering, Seoul National University of Science & Technology)
Publication Information
Journal of the Korean institute of surface engineering / v.46, no.5, 2013 , pp. 229-233 More about this Journal
Abstract
The small punch(SP) tests that can be applied to high strength sheet steel in automobile were carried out to evaluate the behavior of hydrogen embrittlement of DP sheet steels. In order to charge hydrogen at DP sheet steels, DP sheet steels were treated by the electrochemical hydrogen charging method under the charging conditions of current densities of 100, 150 and 200 $mA/cm^2$ for charging times of 5, 10, 25 and 50 hrs. Respectively, After hydrogen charging with experimental conditions, SP tests were performed. From the SP results, the correlations between the variation of bulb diameters and bulb heights with the hydrogen charging conditions were analysed. It was shown that the variation of bulb diameters were not significant with the hydrogen embrittlement due to the amounts of hydrogen charging. On the other hand, the bulb heights were observed to decrease with increasing hydrogen contents. It was thought that these results of the variation of bulb shapes after SP tests would be estimated as the index of evaluation of hydrogen embrittlement.
Keywords
Hydrogen embrittlement; SP test; DP sheet steels; Hydrogen charging;
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Times Cited By KSCI : 2  (Citation Analysis)
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