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http://dx.doi.org/10.5695/JKISE.2014.47.1.033

Nanoindenter Test of 680MPa Dual Phase Steel Charged with Hydrogen  

Choi, Jong-Woon (Department of Materials Science and Engineering, Seoul National University of Science & Technology)
Park, Jae-Woo (Department of New Energy Engineering, Graduate School of Energy & Environment, Seoul National University of Science & Technology)
Kang, Kae-Myung (Department of Materials Science and Engineering, Seoul National University of Science & Technology)
Publication Information
Journal of the Korean institute of surface engineering / v.47, no.1, 2014 , pp. 33-38 More about this Journal
Abstract
Nanoindentater tests were conducted to conducted nanoindentation microhardness of the individual phase of ferrite and martensite of 680MPa dual-phase (DP) steel charged with hydrogen. Hydrogen was charged by electrochemical method with current densities of 150, $200mA/cm^2$ for charging times of 5, 10, 25, 50 hours, respectively. Nanoindenter test results showed that the nanoindentation microhardnesses of ferrite phase of DP steel were varied from min. 1.58 GPa to max. 2.82 GPa, and the nanoindentation microhardnesses of martensite phase varied from min. 3.19 GPa to max. 5.16 GPa with the variation of hydrogen charging conditions. It was observed that the variations of the nanoindention microhardnesses of martenstie phase were higher than those of ferrite phases. It was thought that martensite phase in the 680MPa DP steel was more sensitive than ferrite phase to hydrogen embrittlement.
Keywords
Nanoindentatier test; Electrochemical method; 680MPa DP steel; Hydrogen embrittlement;
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