Analytische Chemie
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- Englisch (2)
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- Additive manufacturing (1)
- Analytical chemistry (1)
- GMR sensors (1)
- Low carbon steel (1)
- Magnetic stray field (1)
- Microstructure (1)
- Neutron diffraction (1)
- Residual stress (1)
- Spectroscopy (1)
- TIG-welding (1)
Organisationseinheit der BAM
- 9.3 Schweißtechnische Fertigungsverfahren (2) (entfernen)
This study examines the relationship between the magnetic mesostructure with the microstructure of low carbon steel tungsten inert gas welds. Optical microscopy revealed variation in the microstructure of the parent material, in the heat affected and fusion zones, correlating with distinctive changes in the local magnetic stray fields measured with high spatial resolution giant magneto resistance sensors. In the vicinity of the heat affected zone high residual stresses were found using neutron diffraction.
Notably, the gradients of von Mises stress and triaxial magnetic stray field modulus follow the same tendency transverse to the weld. In contrast, micro-X-ray fluorescence characterization indicated that local changes in element composition had no independent effect on magnetic stray fields.
Additive Manufacturing (AM) becomes widespread in many technological fields including the precise machining of steel. To assure quality of final products, thorough monitoring of online process is required. We test several monitoring techniques during the AM printing to quickly detect and possibly correct flaws while building a workpiece. Here we show how optical emission spectroscopy can be used to recognize defects that are artificially introduced on a steel printing substrate.