Browse > Article
http://dx.doi.org/10.7842/kigas.2014.18.5.40

Evaluation on Hydrogen Embrittlement of 5 Types of High Strength Dual Phase Steels by Small Punch Test  

Choi, Jong-Un (Dept. of Materials Science & Engineering, Seoul National University of Science & Technology)
Han, Kyung-Gu (Dept. of Materials Science & Engineering, The Graduate School of Industry, Seoul National University of Science & Technology)
Park, Jae-Woo (Dept. of New Energy Engineering, The 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 Gas / v.18, no.5, 2014 , pp. 40-46 More about this Journal
Abstract
The hydrogen embrittlement degree of 5 type high strength DP steel charged with hydrogen by electrochemical method was evaluated by small punch test(SP test). After SP test, SP absorbed energy was remarkably decreased from 363 kgf-mm to 209 kgf-mm with increasing hydrogen charging time from 5hr to 50hr at DP5 specimen under the $200mA/cm^2$ current density condition. It was investigated that the decrease of hydrogen charging amount and SP absorbed energy according to the increase of current density and hydrogen charging time had a linear relationship. And it also investigated that the change of bulb height appeared by the SP test was decreased from 1.79mm to 1.59mm with the hydrogen charging conditions. It was supposed that it could be used as indicator of the evaluation of hydrogen embrittlement because of the similar trend of the formal results of SP absorbed energy. From the SEM observation of fracture area by crack in bulb, the morphology of fracture surface according to increasement of the hydrogen charging amount was varied with the cleavage mode.
Keywords
hydrogen embrittlement; small punch test; SP absorbed energy; cleavage mode;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 K. Hashigushi, T. Kato, M. Nishida, T. Tanaka, Kawasaki Steel Tech. Rep. 1, 70 (1980).
2 H. Shirasawa, J.G. Thomson, Trans. ISIJ, 27, 360 (1987).   DOI
3 H.G. Nelson, D.P. Williams, A.S. Tetelman, Metall. Mater. Trans., 2B, 953 (1971).
4 J. P. Hirth, Metall. Trans., 11A, 861 (1980).
5 G. Katano, K. Ueyama, M. Mori, J. Mater. Sci., 36, 2277 (2001).   DOI   ScienceOn
6 I. Moro, L. Briottet, P. Lemoine, E. Andrieu, C. Blanc, G. Odemer, Mater. Sci. Eng., 527A, 7252 (2010).
7 M.P. Manahan, A.S. Argon, O.K. Harling, J. Nuclear Mater., 103, 1545 (1981).
8 H.S. You, J.K. Lim, S.H. Chung, KWS, 12, 63 (1994)
9 J.W. Park, K.M. Kang, Kor. J. Mater. Res., 22, 29 (2012).   DOI   ScienceOn
10 J.U. Choi, J.W. Park, K.M. Kang, J. Kor. Inst. Surf. Eng., 46, 126 (2013).   DOI   ScienceOn
11 J.W. Park, K.M. Kang, KIGAS, 18, 61 (2014).
12 T. Zhang, W.Y. Chu, K.W. Gao, L.J. Qiao, Mater. Sci. Eng., 347A, 291 (2003).