Effect of manganese content and microstructure on the susceptibility of X70 pipeline steel to hydrogen cracking

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:551

Article

Hejazi, D.¹  Haq, A. J.¹  Yazdipour, N.¹  Dunne, D. P.¹  Calka, A.¹  Barbaro, F.²  Pereloma, E. V.¹ 

[1] Univ Wollongong, Sch Mech Mat & Mechatron Engn, Wollongong, NSW 2522, Australia

[2] BlueScope Steel Ltd, Port Kembla, NSW 2505, Australia

关键词: Pipeline steel;    Microstructure;    Hydrogen charging;    Fracture toughness;    Fractography;    Inclusions;   

DOI  :  10.1016/j.msea.2012.04.076

来源: Elsevier

【 摘 要 】

The influence of composition and microstructure on susceptibility to hydrogen induced cracking (HIC) was investigated in high strength pipeline steels, with Mn contents of 1.2% (standard, X70), and 0.5% (medium, MX70). The HIC resistance of the simulated coarse grained heat affected zone microstructures and normalized X70 transfer bar was also investigated. Notched and fatigue pre-cracked samples were charged with hydrogen prior to three point bend tests. The conditional fracture toughness J(Q) was determined. The results are discussed in relation to grain size, microstructure, composition and the type and distribution of non-metallic inclusions and precipitates. (C) 2012 Elsevier BM. All rights reserved.

【 授权许可】

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