Effects of laser heat treatment on the fracture morphologies of X80 pipeline steel welded joints by stress corrosion
来源期刊：International Journal of Minerals Metallurgy and Materials2014年第9期
论文作者：De-jun Kong Cun-dong Ye
文章页码：898 - 905
摘 要：The surfaces of X80 pipeline steel welded joints were processed with a CO2 laser, and the effects of laser heat treatment（LHT） on H2 S stress corrosion in the National Association of Corrosion Engineers（NACE） solution were analyzed by a slow strain rate test. The fracture morphologies and chemical components of corrosive products before and after LHT were analyzed by scanning electron microscopy and energy-dispersive spectroscopy, respectively, and the mechanism of LHT on stress corrosion cracking was discussed. Results showed that the fracture for welded joints was brittle in its original state, while it was transformed to a ductile fracture after LHT. The tendencies of hydrogen-induced corrosion were reduced, and the stress corrosion sensitivity index decreased from 35.2% to 25.3%, indicating that the stress corrosion resistance of X80 pipeline steel welded joints has been improved by LHT.
De-jun Kong，Cun-dong Ye
College of Mechanical Engineering, Changzhou University
摘 要：The surfaces of X80 pipeline steel welded joints were processed with a CO2 laser, and the effects of laser heat treatment（LHT） on H2 S stress corrosion in the National Association of Corrosion Engineers（NACE） solution were analyzed by a slow strain rate test. The fracture morphologies and chemical components of corrosive products before and after LHT were analyzed by scanning electron microscopy and energy-dispersive spectroscopy, respectively, and the mechanism of LHT on stress corrosion cracking was discussed. Results showed that the fracture for welded joints was brittle in its original state, while it was transformed to a ductile fracture after LHT. The tendencies of hydrogen-induced corrosion were reduced, and the stress corrosion sensitivity index decreased from 35.2% to 25.3%, indicating that the stress corrosion resistance of X80 pipeline steel welded joints has been improved by LHT.
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