IN-SITU INVESTIGATION OF HEALING ON HYDROGEN-ATTACKEDCRACK IN STEEL BY HIGH-TEMPERATURE MICROSCOPE

J Chin Soc Corr Pro

2003, Vol. 23

Issue (3): 179-182 DOI:

Research Report

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IN-SITU INVESTIGATION OF HEALING ON HYDROGEN-ATTACKEDCRACK IN STEEL BY HIGH-TEMPERATURE MICROSCOPE

Chaofang Dong;Jing Xv;Xiaogang Li

北京科技大学

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Abstract The in-situ observation of hydrogen-attacked cracks healing in carbon steel had been done by high-temperature microscope.The whole cracks healing process was recorded at the same time.The results show that the c racks became obviously thinner when heated under 630℃.The escaping of methane a nd inner crack exposure on specimen surface make a certain difference between th is experiment and true condition,the analysis indicates the cracks healing tempe rature in experiment is lower than actual system.The healing of hydrogen attacke d cracks is closely related to heat diffusion of Fe and C atoms in steel.The dri ving force of crack healing results from the plastic deforming energy Es i nduced by the growth of hydrogen attacked bubbles or cracks.The critical conditi on of healing of bubbles or cracks is Es ≥2γ/r (where γ is the surface tension,r is the radius of bubbles or half length of crack).

Key words: high-temperature microscope in-situ hydrogen attack crack healing

Received: 05 November 2001

ZTFLH:	TG111.91
	TG142.71

Corresponding Authors: Chaofang Dong E-mail: dongchf@sina.com

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Chaofang Dong; Jing Xv; Xiaogang Li. IN-SITU INVESTIGATION OF HEALING ON HYDROGEN-ATTACKEDCRACK IN STEEL BY HIGH-TEMPERATURE MICROSCOPE. J Chin Soc Corr Pro, 2003, 23(3): 179-182 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2003/V23/I3/179

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