CRACK HEALING OF HYDROGEN-ATTACKED CRACKSIN CARBON STEEL UNDER HOT PLASTIC DEFORMATION

J Chin Soc Corr Pro

2007, Vol. 27

Issue (2): 104-108 DOI:

Research Report

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CRACK HEALING OF HYDROGEN-ATTACKED CRACKSIN CARBON STEEL UNDER HOT PLASTIC DEFORMATION

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北京科技大学材料学院腐蚀与防护中心

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Abstract Healing of hydrogen-attacked (HA) cracks in carbon steel was studied by using hot press treatment.Under hot plastic deforming at 1000°C and the deformation rate of 40%,the most of HA cracks can be recovered completely within 15 min.Partial HA cracks,which has not been recovered by hot-press treatment,present the spherical cap-shaped with the length of about 4 μm～8 μm.Comparing with the results of high temperature treatment without press (cyclic heat treatment between room temperature and 1000 ℃ for 10 h),both the healing degree and speed under hot plastic deforming are improved obviously.There are not distinct difference of healing results between the direct hot-press healing and pre-heated treatment before hot-press healing.That means the decomposition of methane in HA cracks is not the key step during the whole healing process.

Key words: Carbon steel hydrogen attack crack healing

Received: 27 July 2005

ZTFLH:	TG111.91
	TG142.71

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;. CRACK HEALING OF HYDROGEN-ATTACKED CRACKSIN CARBON STEEL UNDER HOT PLASTIC DEFORMATION. J Chin Soc Corr Pro, 2007, 27(2): 104-108 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2007/V27/I2/104

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