Qualification of Dissimilar Metal Welds for Service in Hydrogen Containing Environment Phase II: Dissimilar Metal Welds with Improved Resistance to Hydrogen Assisted Cracking

Nickel base filler metals are often joined with low- alloy and stainless-steel metals in petrochemical and power generation industries resulting in chemical, thermo-physical, and mechanical property gradients along the interfaces. This is most extreme at the fusion boundary where materials are mixing. The microstructure of the fusion boundary region has sharp interfaces which results in local strain and stress to be experienced at different rates in different areas of the dissimilar metal weld. DIC and a combination of cross weld tensile testing is used to better understand the microstructure-property relationships dominating HAC related failure in the fusion boundary region. This method can determine the local properties both compositionally and microstructurally in all regions of the dissimilar metal weld.  

Industry Mentor: TechnipFMC, Suncor, Shell, Schlumberger 

Faculty: Boian Alexandrov 

Graduate Students: Fernando Romero Consuegra, Will Siefert 

Industry Contacts: Michael Buehner, Dean Hannam, Jorge Penso, Clint Wildash