NDLI: Strain Aging Effects in High Strength Line Pipe Materials

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Duan, Da-Ming Zhou, Joe Rothwell, Brian Horsley, David Pussegoda, Nick
Copyright Year	2008
Abstract	Strain aging behavior can occur in almost all steels, including micro-alloyed steels used in high-strength pipelines. The direct effects of strain aging on mechanical properties can include increased hardness, yield strength and tensile strength, and reduced ductility and toughness. Strain aging may take place in processes where the pipe material experiences thermal cycles, such as coating, welding and in-service heating, and may occur with or without additional plastic strain. The changes of material mechanical properties could seriously challenge the design principles and methodologies, so that these aging effects need to be taken into account. This is especially important for pipelines expected to see deformation-controlled loading conditions. This is not only because the difference in strain aging effects between a weld and the parent material can easily change the strength overmatch condition of the weld, leading to unpredictable girth weld flaw tolerance, but also because the return of Lu¨ders behavior on the stress-strain curves of these materials significantly reduces the pipe buckling load resistance. In addition, any change in fracture resistance due to strain aging may impact the fracture control design practice, particularly if the pipe material may be expected to experience plastic deformation during service. In this paper, a brief review of strain aging behavior in steels is presented, with an emphasis on the effects on the mechanical properties and toughness of three high-strength line pipe steels. Material strain aging mechanical test procedures of three high grade pipes will be described and the test results will be discussed.
Sponsorship	International Petroleum Technology Institute and the Pipeline Division
Starting Page	317
Ending Page	326
Page Count	10
File Format	PDF
ISBN	9780791848593
DOI	10.1115/IPC2008-64427
e-ISBN	9780791838358
Volume Number	2008 7th International Pipeline Conference, Volume 3
Conference Proceedings	2008 7th International Pipeline Conference
Language	English
Publisher Date	2008-09-29
Publisher Place	Calgary, Alberta, Canada
Access Restriction	Subscribed
Subject Keyword	Cycles Deformation Stress-strain curves Welding Pipelines Ductility Mechanical properties Fracture (materials) Steel Coatings Engineering design processes Stress Tensile strength Fracture toughness Design Fracture (process) Heating Yield strength Mechanical testing Coating processes Pipes Buckling
Content Type	Text
Resource Type	Article

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