EFFECT OF ALLOYING ELEMENT VANADIUM ON HYDROGEN EMBRITTLEMENT SUSCEPTIBILITY FOR RAIL STEEL

J Chin Soc Corr Pro

1998, Vol. 18

Issue (2): 113-118 DOI:

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EFFECT OF ALLOYING ELEMENT VANADIUM ON HYDROGEN EMBRITTLEMENT SUSCEPTIBILITY FOR RAIL STEEL

LI Jin-xu WANG Yan-bin CHU Wu-yang(University of Science and Technology Beijing; Beijing 100083)MEI Dong-sheng YU Meng-wen (Panzhihna Iron and Steel Co.; Panzhihua 710076)

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Abstract The threshold hydrogen concentrations for hydrogen blistering and hydrogen-induced elongation loss were 0.7×10-1% and 0.09× 10-4% for DB steel without vanadium; as well as 2.2×10-4% and 0.26×10-4% for PD3 steel containing vanadium, respectively. Obviously, vanadium increase the threshold hydrogen concentration, resulting in decrease in hydrogen embrittlement susceptibility. The main cause for the effect was that alloying element vanadium and carbon combined to form VC, which was irreversible hydrogen trap. The energy for VC was 82.3kJ/mol and its density was 3.36×1021/cm3. The hydrogen-induced elongation loss Iδ decreased linearly with the reciprocal of the diffusible hydrogen concentration C0 for both the steels, i. e. Iδ = 100-9/C0, for DB steel and Iδ = 105-27/C0 for PD3 steel. This showed that vanadium could decrease the elongation loss.

Key words: Rail steel Hydrogen embrittlement Vanadium

Received: 25 April 1998

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LI Jin-xu WANG Yan-bin CHU Wu-yang(University of Science and Technology Beijing; Beijing 100083)MEI Dong-sheng YU Meng-wen (Panzhihna Iron and Steel Co.; Panzhihua 710076). EFFECT OF ALLOYING ELEMENT VANADIUM ON HYDROGEN EMBRITTLEMENT SUSCEPTIBILITY FOR RAIL STEEL. J Chin Soc Corr Pro, 1998, 18(2): 113-118.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1998/V18/I2/113

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