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Correlation between Microstructure and Hydrogen Degradation of 690 MPa Grade Marine Engineering Steel

Authors
  • Ma, Heng
  • Tian, Huiyun1
  • Xin, Juncheng1
  • Cui, Zhongyu1
  • 1 (Z.C.)
Type
Published Article
Journal
Materials
Publisher
MDPI AG
Publication Date
Feb 10, 2021
Volume
14
Issue
4
Identifiers
DOI: 10.3390/ma14040851
PMID: 33578961
PMCID: PMC7916727
Source
PubMed Central
Keywords
License
Green

Abstract

Electrochemical H charging, hydrogen permeation, and hydrogen-induced cracking (HIC) behavior of 690 MPa grade steel substrate and different heat-treatment states (annealed, quenched, normalized, tempered) are investigated by cyclic voltammetry (CV), hydrogen permeation, electrochemical H charging, and slow strain rate tensile test (SSRT). The results show that hydrogen diffuses through the steel with the highest rate in base metal and the lowest rate in annealed steel. The hydrogen-induced cracks in base metal show obvious step shape with tiny cracks near the main crack. The cracks of annealed steel are mainly distributed along pearlite. The crack propagation of quenched steel is mainly transgranular, while the hydrogen-induced crack propagation of tempered steel is along the prior austenite grain boundary. HIC sensitivity of base metal is the lowest due to its fine homogeneous grain structure, small hydrogen diffusion coefficient, and small hydrogen diffusion rate. There are many hydrogen traps in annealed steel, such as the two-phase interface which provides accommodation sites for H atoms and increases the HIC susceptibility.

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