08597 Development of a Corrosion Resistant and Highly Weldable Filler Metal for Use with Alloy 690

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Product Number: 51300-08597-SG

ISBN: 08597 2008 CP

Author: Robert Etien, Thomas Capobianco, John Mullen, and George Young

Publication Date: 2008

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This paper reports on a long term research effort to develop an improved filler metal for gastungsten- arc welding (GTAW) of Alloy 690. The goal of this work was to maintain the corrosion resistance of wrought Alloy 690 while eliminating ductility dip cracking (DDC) or other as-welded defects in prototypical welds. Three candidate alloys of 24 wt.%, 27 wt.%, and 30 wt.% chromium have been evaluated for their stress corrosion cracking (SCC) resistance, weldability, mechanical properties, and phase stability. These alloys are compositionally similar to the Alloy 600 filler metal EN82 with high amounts of chromium. Results of testing to date show that these chromium additions significantly enhance the SCC resistance over EN82 while maintaining the weldability, mechanical properties, and phase stability of Alloy 600 filler metal. Results from weld mockups, weldability testing, microstructural and microchemical characterization, and computational modeling also show that DDC is a form of precipitation-induced-cracking and that it can be effectively mitigated via alloying to control the type and extent of carbide formation.