Solid State Joining of Creep Enhanced Ferritic Steels Email Page
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Performer:  Pacific Northwest National Laboratory (PNNL) Location:  Richland, Washington
Project Duration:  10/01/2014 – 09/30/2018 Award Number:  FWP-66059
Technology Area:  Plant Optimization Technologies Total Award Value:  $1,075,000
Key Technology:  High Performance Materials DOE Share:  $1,075,000
Performer Share:  $0

Flat plate friction stir welds in HSLA65 plate, stay flat!
Flat plate friction stir welds in HSLA65 plate, stay flat!

Project Description

The goal of this project is to develop an alternative solid state joining technology, Friction Stir Welding (FSW), which can enable higher performance from Creep Strength Enhanced Ferritic (CSEF) steels, anticipated to be used in advanced ultrasupercritical (AUSC) coal-fired power plants. A primary problem in the high temperature application of welded CSEF steels is that the welds of these steels fail (Type IV cracking) at a creep life far below that of the base metal. This has led to a reduced performance - either a reduced calculation of strength and lifetime for assemblies made from these alloys, or the use of expensive post weld heat treatment procedures to recover base metal creep strength in the weldment. Previous work at PNNL on the NETL funded project. "Joining of Advanced High-Temperature Materials", showed that a new joining process, FSW, has the ability to produce welds in Grade 91M CSEF plate that have significantly improved creep performance over equivalent fusion welds.

Project Benefits

This project is expected to generate pertinent creep-fatigue data and develop new lifetime models that will allow accurate prediction of the lifetimes of those fossil fuel power plant components that are subjected to flexible operation (e.g., load cycle following of renewable power generation). Improvements to creep-fatigue data and lifetime models may advance the development of advanced power plant designs that will lead to improvements in efficiency and operational flexibility resulting in lower operating costs.

Presentations, Papers, and Publications

Contact Information

Federal Project Manager Vito Cedro:
Technology Manager Briggs White:
Principal Investigator Glenn Grant: