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(OSU) Stress Relief and Stress Relaxation Cracking in Creep Resistant Steel Welds for Petrochemical and Power Generation Application- Phase II

 

 

  • Highly restrained thick wall low alloy steel welds are subjected to high stresses and temperatures in service.
  • Post weld heat treatments (PWHT) are conducted to relieve residual stresses that form during welding.
  • This makes these welds subject to the risk of Stress Relief Cracking (SRC) and Stress Relaxation Cracking (SRxC).
  • A GleebleTM-based SRC test procedure has been developed at The Ohio State University.
  • The motivation for this project is to further develop this testing procedure and fundamentally study the mechanism of stress relief cracking.
  • Such testing procedure will be used to rank SRC susceptibility, identify safe PWHT conditions, and study the SRC mechanism.
  • Currently, there is not a standardized SRC test that accurately reproduces thermomechanical phenomenon a weldment would experience during PWHT that would lead to SRC.

 

Industry Sponsor: Shell

Faculty: Boian Alexandrov and Avi Benatar

Graduate Student: Conner Sarich

Industry Contact: Jorge Penso