Effect of Microstructure of Pipeline Steels on Ductility and Fatigue Properties in High Pressure Hydrogen Atmosphere

A number of studies have been conducted in the past to understand the effect of the steel composition and microstructure on the tendency to lose ductility through hydrogen-induced embrittlement. Although some general rules have been developed to relate the properties of steels with the tendency for hydrogen embrittlement, much needs to be learned on the effect of many alloying elements on the hydrogen embrittlement in steels. The main objective is to conduct fatigue and fracture-toughness property test. Fatigue damage is typically divided into three stages: crack initiation, crack propagation and final failure. These three stages are important in determining the fatigue life of structural components. Fatigue-crack-growth-rate properties are of vital importance for the structural-reliability assessment, when a structural component is subjected to cyclic loading. Fatigue-crack propagation-rate results can be used to predict the crack-growth life of a component.

• Record URL:
  http://primis.phmsa.dot.gov/matrix/prjHome.rdm?prj=324
• Supplemental Notes:
  • Program Information: Pipeline Safety Research, Pipeline Safety

Language

• English

Project

• Status: Completed
• Funding: $74719.00
• Contract Numbers:

  DTPH56-10-T-000001

• Sponsor Organizations:

  Pipeline and Hazardous Materials Safety Administration

  U.S. Department of Transportation
  East Building, 2nd Floor 1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Project Managers:

  Merritt, James

• Performing Organizations:

  University of Tennessee, Knoxville

  Knoxville, TN  United States 
• Principal Investigators:

  Laiw, Peter

• Start Date: 20100501
• Expected Completion Date: 0
• Actual Completion Date: 20120427
• Source Data: RiP Project 31194

Subject/Index Terms

• TRT Terms: Ductility; Embrittlement; Failure; Fatigue cracking; Fracture mechanics; Microstructure; Repeated loads
• Uncontrolled Terms: Structural components
• Subject Areas: Maintenance and Preservation; Pipelines;

Filing Info

• Accession Number: 01493248
• Record Type: Research project
• Source Agency: Department of Transportation
• Contract Numbers: DTPH56-10-T-000001
• Files: RIP
• Created Date: Sep 20 2013 1:00AM