수소주입시킨 680MPa DP강의 나노인덴터 시험

• Published in: Biuletyn Uniejowski Vol. 47; no. 1; pp. 33 - 38
• Main Authors: 최종운(Jong-Woon Choi), 박재우(Jae-Woo Park), 강계명(Kae-Myung Kang)
• Format: Journal Article
• Language: Korean
• Published: 한국표면공학회 2014
• Subjects: 기계공학; 680MPa DP steel; Nanoindentatier test; Electrochemical method; Hydrogen embrittlement
• ISSN: 1225-8024; 2299-8403; 2288-8403
• DOI: 10.5695/JKISE.2014.47.1.033

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.