Study on the Hydrogen Embrittlement of Aermet100 Using Hydrogen Permeation and SSRT Techniques

Aermet100 steel suffers greatly from hydrogen embrittlement due to its ultra-high strength. During the corrosion process as part of its service life, reduction of H + in an acidic environment and H 2 O in a deaerated near-neutral environment are the main sources of hydrogen generation. Hydrogen perm...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2017-09, Vol.48 (9), p.4046-4057
Main Authors: Hu, Yabo, Dong, Chaofang, Luo, Hong, Xiao, Kui, Zhong, Ping, Li, Xiaogang
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Coalescing
Corrosion
Cracking (chemical engineering)
Cracking (fracturing)
Cracks
Fracture mechanics
High strength
Hydrogen
Hydrogen embrittlement
Hydrogen permeation
Materials Science
Metallic Materials
Metallurgy
Microcracks
Nanotechnology
Penetration
Service life
Slow strain rate
Steel alloys
Steels
Strain rate
Structural Materials
Surfaces and Interfaces
Thin Films
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Summary:Aermet100 steel suffers greatly from hydrogen embrittlement due to its ultra-high strength. During the corrosion process as part of its service life, reduction of H + in an acidic environment and H 2 O in a deaerated near-neutral environment are the main sources of hydrogen generation. Hydrogen permeation into Aermet100 steel can occur even in the atmosphere. After tempering, the coherent precipitations can hinder diffusion of hydrogen in the tempered steel, causing the apparent hydrogen diffusivity and steady hydrogen permeation current to decrease. The fracture morphology of tempered Aermet100 steel after a slow strain rate test in an acidic solution is predominantly micro-void coalescence with few inner cracks. As the solution pH decreases, micro-cracks initiate not only on the side surface but also within the steel. Coalition of micro-cracks accelerates the overall cracking process.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-017-4159-x