Rapid solidification during welding of duplex stainless steels – in situ measurement of the chemical concentration by Laser-Induced Breakdown Spectroscopy (LIBS)

Duplex stainless steels (DSS) are frequently used, especially in applications requiring high strength combined with high corrosion resistance in aggressive media. Examples include power plant components and maritime structures. During welding of these steels, local variations in chemical composition...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2023-01, Vol.1274 (1), p.12018
Main Authors: Quackatz, L, Griesche, A, Kannengiesser, T
Format: Article
Language:English
Subjects:
Alloying elements
Chemical composition
Corrosion resistance
Duplex stainless steels
Gas tungsten arc welding
In situ measurement
Laser beam welding
Laser induced breakdown spectroscopy
Manganese
Mechanical properties
Nickel
Parameter identification
Power plant components
Power plants
Rapid solidification
Rare gases
Seam welds
Spectrum analysis
Stainless steel
Welding parameters
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Summary:Duplex stainless steels (DSS) are frequently used, especially in applications requiring high strength combined with high corrosion resistance in aggressive media. Examples include power plant components and maritime structures. During welding of these steels, local variations in chemical composition can occur. This results in ferritization of the material and negatively affects the mechanical properties of the components. In this work, tungsten inert gas (TIG) welding experiments were performed with DSS. Chemical composition analysis was realized in situ by using Laser Induced Breakdown Spectroscopy (LIBS). The aim of the work is to quantitatively measure the chemical composition in the weld seam of various DSS and to identify possible influences of welding parameters on the microstructure of the material. The chemical concentrations of the main alloying elements Cr, Ni, Mn on the surface of the sample during the welding process and the cooling process were measured. Mn and Ni are austenite stabilizers and their content increases during welding by using certain high alloyed filler material. Spectra were recorded every 1.3 s at a spacing of approximately 2 mm. During the cooling process the location of the measurement was not changed. The LIBS method is proofed to be suitable for the quantitative representation of the chemical compositions during the welding process.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/1274/1/012018