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doi:https://doi.org/10.5781/JWJ.2018.36.6.10    [Epub ahead of print]
Weldability Study on SS 304B4 Joined using Boron Containing Austenitic Stainless Steel Consumable
M. Divya*, S. K. Albert*
*Materials Joining Section, Materials Development & Technology Division, Materials Engineering Group, Indira Gandhi Centre for Atomic Research, HBNI, Kalpakkam 603102, India.
Correspondence: M. Divya  Email: divya_mjs@igcar.gov.in
Received September 18, 2018  Accepted November 19, 2018  Published online December 6, 2018
ABSTRACT
304B4 stainless steel contains ~1.2 wt.% of boron intentionally added for neutron shielding purposes in nuclear power plants and nuclear waste storage applications. Weldabilty of 304B4 stainless steel is generally considered to be poor because boron is almost insoluble in austenite phase and has a tendency to segregate in the liquid phase during solidification. This results in formation of different types of borides in the eutectic which melts at low temperature and makes the steel susceptible to cracking. Among the welding consumables specified in standards and codes, E309 consumable is the one generally recommended for this steel, but electrodes with controlled addition of boron (E308BRN) is also available. A systematic study on solidification cracking susceptibility of 304B4 stainless steel weld joint prepared using E308BRN containing ~1 wt.% B has been carried out. Further, mechanical properties of weld joints made with this electrode are compared with that made from E309 electrode. Results show that E308BRN electrode can be chosen for applications involving low restraint forces to produce crack free joints. Mechanical properties of the joints made with both E308BRN and E309 are poor when compared to the base metal. This is attributed to continuous network of eutectic borides present in the interdendritic regions of fusion zone and partially melted zones of the weld joints.
Keywords: Boron added stainless steel | Solidification cracking | Tensile properties | Impact properties | Welding consumables
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