Mehanical properties of electron beam welded joints in thick gage CA6NM stainless steel

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1007/s11665-017-2872-7
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Name affiliation
  1. National Research Council of Canada. Aerospace
FormatText, Article
Journal titleJournal of Materials Engineering and Performance
ISSN1059-9495
1544-1024
Volume26
Issue10
Pages4768–4780
Subjectas-welded joints; bend testing; CA6NM martensitic stainless steel; Charpy V-notch testing; electron beam welding; tensile testing
Abstract
Design of hydroelectric turbine components requires high integrity welds (without detectable volumetric defects) in heavy gage sections of stainless steel materials, such as ASTM A743 grade CA6NM—a low carbon 13% Cr-4% Ni martensitic stainless steel that is manufactured in cast form. In this work, 90-mm-thick plates of CA6NM were joined using a single-pass autogenous electron beam (EB) welding process and the mechanical properties were evaluated in the as-welded condition to characterize the performance of the joints. The static tensile properties that were evaluated in two directions—transverse and longitudinal to the EB weld seam—demonstrated conformance of the joints with the requirements of the ASME Section IX standard. The Charpy impact energies of the EB welds—measured at −18 °C on samples with V-notch roots located in the fusion and heat-affected zones—met the minimum requirements of 27 J specified in ASME Section VIII standard. In addition, bend tests that were conducted on the entire weld cross section displayed no discontinuities on the tension side of the bent joints. Hence, the developed EB welding process was demonstrated to render high-performance joints and promises key advantages for industrialization, such as cost savings through reductions in consumable material, production time and labor intensity.
Publication date
PublisherSpringer
LanguageEnglish
Peer reviewedYes
NPARC number23003197
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Record created2018-05-07
Record modified2020-03-16
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