TRAPPING OF HYDROGEN BY PRECIPITATE TiC IN LOW CARBON STEEL

Acta Metall Sin

1986, Vol. 22

Issue (3): 1-8 DOI:

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TRAPPING OF HYDROGEN BY PRECIPITATE TiC IN LOW CARBON STEEL

by XIAN Aiping; LI Peiji; WANG Yikang; LI Xun(H. Lee) (Institute of Metal Research; Academia Sinica; Shenyang)

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by XIAN Aiping; LI Peiji; WANG Yikang; LI Xun(H. Lee) (Institute of Metal Research; Academia Sinica; Shenyang). TRAPPING OF HYDROGEN BY PRECIPITATE TiC IN LOW CARBON STEEL. Acta Metall Sin, 1986, 22(3): 1-8.

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Abstract The influence of Ti on hydrogen diffusion in low carbon steel was studied by Davanathan's electrochemical method. The experimental results show that the strong trapping of hydrogen is appeared in the steel in which the Ti precipitated as dispersed TiC during aging after solution treatment. The trapping energies of the precipitation of dispered TiC are evaluated as 27.88±0.18 and about 21 kJ/mol respectively before and after the α→γ phase transformation of the steel. However, these do not coincide with the value of 94.55 kJ/mol reported by Pressouyre. The lowest apparent diffusion coefficient of hydrogen in the steel Fe-0.2Ti-0.1C is found after solution-treated at 1200℃ and aged at 550℃. It seems to be caused by the low temperature precipitate TiC with non-cubic structure and by many lattice vacancies which distort the local periodical potential fields around it.

Received: 18 March 1986

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