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

Title & Authors
An Analysis of Small Punch Test Conducted with the High Strength Dual Phase Sheet Steels Charged with Hydrogen
Choi, Young-Cheul; Park, Jae-Woo; Kang, Kae-Myung;

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 $\small{mA/cm^2}$ 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;
Language
Korean
Cited by
1.
수소주입시킨 680MPa DP강의 나노인덴터 시험,최종운;박재우;강계명;

한국표면공학회지, 2014. vol.47. 1, pp.33-38
2.
수소주입시킨 DP박강판의 SP시험과 수소취성 관계 해석,박재우;강계명;

한국가스학회지, 2014. vol.18. 1, pp.61-67
3.
다른 전해질분위기에서 수소주입시킨 TRIP강의 SP시험,김광식;유광현;박재우;강계명;

한국가스학회지, 2015. vol.19. 1, pp.64-70
1.
Small Punch Test of TRIP Steel Charged with Hydrogen under Different Electrolyte Condition, Journal of the Korean Institute of Gas, 2015, 19, 1, 64
2.
Analysis of Correlation between the Hydrogen Embrittlement and the Small Punch Test for Hydrogen-charged Dual Phase Steels, Journal of the Korean Institute of Gas, 2014, 18, 1, 61
3.
Nanoindenter Test of 680MPa Dual Phase Steel Charged with Hydrogen, Journal of the Korean institute of surface engineering, 2014, 47, 1, 33
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