Impact of laser-induced breakdown spectroscopy implementation for the quantification of carbon content distribution in archaeological ferrous metals

Bai, Xueshi; Allégre, Hortense; Gosselin, Manon; Dillmann, Philippe; Lopez, Maxime; Téreygeol, Florian; Detalle, Vincent

doi:10.1016/j.sab.2020.105964

Cited by 4 publications

(5 citation statements)

References 28 publications

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“…The SI mineralogy was investigated by SEM in backscattered-electron mode (BSD). The carbon content in the metal matrix adjacent to each analyzed SI was estimated using the inverse lever rule [12]. This calculation was based on the volume fractions of ferrite and pearlite measured by the Image J 1.54a software environment for image analysis [13].…”

Section: Experimental Methodsmentioning

confidence: 99%

Exploring the Manufacturing Process of a Renaissance Breach Pike

Merico,

Faccoli,

Gotti

et al. 2023

Metals

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An archaeometallurgical study of a Renaissance breach pike was performed to elucidate its manufacturing process. Optical microscopy observations and microhardness measurements indicated that the breach pike was forged starting from a heterogeneous steel lump. The microstructural features were compatible with post-forging air cooling. The chemistry of a large set of nonmetallic inclusions was investigated by scanning electron microscopy coupled with X-ray dispersive spectroscopy. Compositional data were analyzed by multivariate statistics to distinguish smelting-related slag inclusions. A logistic regression model indicated that the steel was probably produced by the direct method. The liquidus temperatures of the slag inclusions indicated maximum smelting temperatures in the range of 1200 °C to 1300 °C. A thermodynamic-based model was adopted to estimate the average smelting conditions in terms of temperature and oxygen chemical potential and investigate the disequilibrium of slag inclusion–metal systems. For low-disequilibrium systems, the computed temperature values range between 1095 °C and 1118 °C, while the oxygen chemical potentials (μO2) span from −442 to −374 kJ/mol.

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Section: Experimental Methodsmentioning

confidence: 99%

Exploring the Manufacturing Process of a Renaissance Breach Pike

Merico,

Faccoli,

Gotti

et al. 2023

Metals

View full text Add to dashboard Cite

show abstract

“…The crater depth is estimated at about 17 µm for macro-analysis and 37 µm for micro-analysis [20]. As a result, the penetration depth for one shot is about 68 nm for macro-LIBS and 0.15 µm for micro-LIBS, which means the depth resolutions, respectively.…”

Section: Calibration Curves and Quantitative Analysis Abilitiesmentioning

confidence: 98%

“…A Widmanstätten structure has been found with a typical acicular ferrite, which shows a fabrication on fast cooling state. In order to obtain the quantitative mapping, six reference steel samples were used to build a calibration curve for macro-and micro-analysis in previous works [19,20]. They all have the equilibrium homogeneous phases with the carbon concentrations of 0.006%, 0.08%, 0.44%, 0.45%, 0.59% and 0.75%.…”

Section: Samples and Their Propertiesmentioning

confidence: 99%

“…LIBS experiments are carried with macro and micro-analysis laser beams as described in our previous work [20]. The LIBS setup is shown in Fig.…”

Section: Libs and Dige Experimental Setupsmentioning

confidence: 99%

“…Fig. 6 shows the carbon distribution on these two areas based on 100 laser shots for each point by removing the first 20 shots in case of surface pollution (20 shots in our experimental condition remove about 3 µm of the material surface [20]). The carbon content distributions are different, although the optical images for these two areas are similar.…”

Section: Mapping For Archaeological Samplesmentioning

confidence: 99%

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