Overview
| Project No. | 323 |
|---|---|
| Contract No. | DTPH56-10-T-000001 |
| Research Award Recipient | The University of Tennessee 505 Summer Place -- UTT 946 Knoxville, TN 37902 |
| AOTR | James Merritt |
| Researcher Contact Info | Dr. Wei Zhang 865/241-4905 zhangw@ornl.gov |
| Peer Review | More than Effective |
| Peer Review | Very Effective |
| Peer Review | More than Effective |
| Technology Demonstrated | TBD |
|---|---|
| Commercialized (in whole/part) | TBD |
| Commercial Partner | Empty Value |
| Net Improvement | Empty Value |
| Project Status | Closed |
|---|---|
| Start Fiscal Year | 2010 (05/01/2010) |
| End Fiscal Year | 2015 (11/30/2014) |
| PHMSA $$ Budgeted | $665,211.00 |
Main Objective
Built upon proven technologies, this proposal research aims at (i) advancing the general knowledge related to fatigue and fracture properties of pipeline steel welds subject to high pressure hydrogen atmosphere and (ii) developing technologies for weld property improvement.
In particular, the project objectives are as follows:
- Apply Multiple-Notch Tensile and Spiral Notch Torsion Tests for measuring the local tensile strength and fracture toughness of weld region in high-pressure hydrogen.
- Develop a cost-effective low-frequency cyclic fatigue testing technique for measuring the weld fatigue property in high-pressure hydrogen.
- Develop the technical basis and database of hydrogen-induced degradation of weld mechanical properties as a function of pressure, temperature and microstructure.
- Evaluate technologies for improving the HE and IGSCC resistance of steel welds. The technologies include (1) tailoring residual stress by overlay welds, (2) new welding consumables, and (3) friction stir welding.
Public Abstract
Comprehensive knowledge of mechanical properties of pipeline steels in high-pressure hydrogen is essential for the structural integrity of a pressurized hydrogen transport system. This project focuses on obtaining much needed data on fracture toughness and fatigue life for weld regions. For testing of weld regions, cost-effective testing techniques developed in previous federal-funded programs will be further refined and applied to investigate the effects of pressure and temperature on the degradation of weld fracture toughness in high-pressure hydrogen. A novel cost-effective low-frequency fatigue test apparatus will be developed to determine the weld fatigue life under realistic in-service cyclic loading frequencies of hydrogen pipelines. These property data will be critical to support industry consensus standards for hydrogen transport via pipeline, and to support the design and maintenance operation by pipeline operators. In addition, advanced welding techniques will be demonstrated to control the weld residual stress and to tailor the weld microstructure for improving weld resistance to HE and IGSCC.
Relevant Files & Links
Final Report
Final Report 1231 7.pdf
Technical Reports and Documents
Paper presented titled "MICROSTRUCTURE AND MECHANICAL PROPERTY PERFORMANCE EVALUATION OF COMMERCIAL GRADE API PIPELINE STEELS IN HIGH PRESSURE GASEOUS HYDROGEN"
Stalheim_-_Microstructure_and_Mechanical_Prop_in_Gaseous_Hydrogen_-_Final_Manuscript.pdf
Paper titled "Design Analysis of steel concrete composite vessel for Stationary Storage of High-Pressure Hydrogen
Other Files
2007 NACE paper on hydrogen
Project status presentation on weld propertys research October 2012