NDLI: Development of In Situ Techniques for Torsion and Tension Testing in Hydrogen Environment

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Wang, John Jy-An Ren, Fei Zhang, Wei Feng, Zhili Anovitz, Lawrence Chen, Zhe Xu, Hanbing
Copyright Year	2011
Abstract	Reliability of hydrogen pipelines and storage tanks is significantly influenced by the mechanical performance of the structural materials exposed to the hydrogen environment. Fracture behavior and fracture toughness are of specific interest since they are relevant to structural integrity. However, many conventional fracture testing techniques are difficult to be realized under the presence of hydrogen. Thus it is desired to develop novel in situ techniques to study the fracture behavior of structural materials in hydrogen environments. In this study, two special testing apparatus were designed to facilitate in situ fracture testing in H2. In addition to a multi-notch tensile fixture, a torsional fixture was developed to utilize an emerging fracture testing technique, Spiral Notch Torsion Test (SNTT). The design concepts will be discussed. Preliminary in situ testing results indicated that the exposure to H2 significantly reduces the fracture toughness of 4340 high strength steels by up to 50 percent. Furthermore, SNTT tests conducted in air demonstrated a significant fracture toughness reduction in samples subject to simulated welding heat treatment using a Gleeble machine, which illustrated the effect of welding on the fracture toughness of this material.
Sponsorship	Pressure Vessels and Piping Division
Starting Page	1317
Ending Page	1323
Page Count	7
File Format	PDF
ISBN	9780791844564
DOI	10.1115/PVP2011-57676
Volume Number	Volume 6: Materials and Fabrication, Parts A and B
Conference Proceedings	ASME 2011 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2011-07-17
Publisher Place	Baltimore, Maryland, USA
Access Restriction	Subscribed
Subject Keyword	Pipeline steel Welding Hydrogen Torsion test In situ testing Tensile test Embrittlement Tensile testing Pipelines Torsion Testing
Content Type	Text
Resource Type	Article

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Hydrogen Embrittlement for X-70 Pipeline Steel in High Pressure Hydrogen Gas

In-Situ Hollow Sample Setup Design for Mechanical Characterisation of Gaseous Hydrogen Embrittlement of Pipeline Steels and Welds

Development of a Multi-Pass Weld Transverse Cracking Test

Orientation Dependence of Hydrogen Accelerated Fatigue Crack Growth Rates in Pipeline Steels

Weld Metal Hydrogen Cracking in Transmission Pipelines Construction

Development of Optimized Weld Metal Chemistries for Pipeline Girth Welding of High Strength Line Pipe

Tensile and Toughness Properties of Pipeline Girth Welds

In-Situ Monitoring of Hydrogen Embrittlement in Ferritic Steel Pipelines

Effects of grain size on hydrogen environment embrittlement of high strength low alloy steel in 45mpa gaseous hydrogen (2009).

Development of In Situ Techniques for Torsion and Tension Testing in Hydrogen Environment

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