Post-weld tempered microstructure and mechanical properties of hybrid laser-arc welded cast martensitic stainless steel CA6NM

Download
  1. Get@NRC: Post-weld tempered microstructure and mechanical properties of hybrid laser-arc welded cast martensitic stainless steel CA6NM (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1007/s11663-015-0578-5
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleMetallurgical and Materials Transactions B
ISSN1073-5615
1543-1916
Pages112
SubjectMetallic materials; Thin films; Nanotechnology; Cold metal transfer; Martensitic stainless steel
AbstractManufacturing of hydroelectric turbine components involves the assembly of thick-walled stainless steels using conventional multi-pass arc welding processes. By contrast, hybrid laser-arc welding may be an attractive process for assembly of such materials to realize deeper penetration depths, higher production rates, narrower fusion, and heat-affected zones, and lower distortion. In the present work, single-pass hybrid laser-arc welding of 10-mm thick CA6NM, a low carbon martensitic stainless steel, was carried out in the butt joint configuration using a continuous wave fiber laser at its maximum power of 5.2 kW over welding speeds ranging from 0.75 to 1.2 m/minute. The microstructures across the weldment were characterized after post-weld tempering at 873 K (600 °C) for 1 hour. From microscopic examinations, the fusion zone was observed to mainly consist of tempered lath martensite and some residual delta-ferrite. The mechanical properties were evaluated in the post-weld tempered condition and correlated to the microstructures and defects. The ultimate tensile strength and Charpy impact energy values of the fully penetrated welds in the tempered condition were acceptable according to ASTM, ASME, and industrial specifications, which bodes well for the introduction of hybrid laser-arc welding technology for the manufacturing of next generation hydroelectric turbine components.
Publication date
PublisherSpringer International Publishing
PlaceBoston, MA, USA
LanguageEnglish
AffiliationAutomotive and Surface Transportation; Aerospace; National Research Council Canada
Peer reviewedYes
Identifier578
NPARC number23000305
Export citationExport as RIS
Report a correctionReport a correction
Record identifierae6e3a6b-7d95-405b-9175-685d801b4184
Record created2016-07-06
Record modified2016-07-06
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)
Date modified: