142 Prakt. Met. Sonderband 46 (2014)
very low oxygen levels. In practice, the method is suitable when there is no free oxygen, GEFU(
which is normally the case for killed steels. a. LASEF
While standard samples for inclusions in steel do not exist, these examples constitute an m
undisputable_validation of the Spark-DAT model used for calculating the inclusion size. VERS(
| | .T. Schub
6. INSTRUMENTAL AND EXPERIMENTAL Institut fü
The inclusion analyses were performed with the ARL iSpark 8860 and ARL 4460 Spark-
DAT spectrometers operated with OXSAS analytical software, in which the inclusion ZUSAM
analysis algorithms are embedded. Single measurement was obtained in about 20s (with a
each model) by running an analytical program including full spectrochemical analysis and Das selel
Spark-DAT methods for inclusions analysis. Sample preparation was paper grinding for ves Ferti
standard inclusion determinations (qualitative/comparative) and milling for advanced ones rienfertigt
(quantitative/absolute) where contamination are to be totally avoided. - die Werk
ten Probe
7. SUMMARY motor be
a. Ce oo : i. So oo a. Co einer Me:
Since many years Spark-DAT methods allow Thermo Scientific OES spectrometers (ARL legierung
4460, ARL iSpark) characterization of micro-inclusions in steel (oxides, sulfides, spinels, legt. Die
nitrides or others). Several aspects of the methods explain the continuously growing deutlich |
interest from the steel community: : Co aa a a ar konventic
- Low investment cost. instrument is used already for OES spectrochemical analysis tallwende
- Unrivalled analysis speed: inclusion characterized in more than 30 samples analyzed by
standard spectrochemical OES per hour and with no additional time oo Lo | |
FLOW running cost: no difference in sample preparation, maintenance and consumables 1. EIN
If the methods cannot always substitute standard methods, high speed makes them
unique for the control of inclusions during the production. They can however be extremely Das selel
beneficial and simple to implement in other contexts: fast investigative screening, geht Prot
qualification of incoming metallic goods and inclusion control in finished or semi-finished zubauen.
goods. The most advanced methods allow: © I sersinter
- Quantitative size (distribution) analysis for various types of inclusions 4 additives
- ‘Quantitative determination of oxygen down to a few ppm in killed-steels. Der Erfol
rial proze
N : rienteilen
REFERENCES serschme
5 | Co . nétiger N
[1] Zhang L, Thomas B G. State of the Art in Evaluation and Control of Steel Cleanliness,
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[2] Key-to-Metals, Clean Steel, http://www.keytometals.com Se
[3] Goransson M, Reinholdsson F, Willman K. Evaluation of Liquid Steel Samples for the
Determination of Microinclusion Characteristics by Spark-Induced Optical Emission Beschic
Spectroscopy, | & S maker, Vol. 26 (5), 1999, 53-58 So
[4] Meilland R, Dosdat L. Rapid characterization of inclusionary cleanliness in steels by
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[5] LiK, Halasz E, Béhlen J-M, Ultra-fast quantitative analysis of non-metallic inclusions Baur
in steel, Millennium Steel 2011, pp 179-182. on I | N
[6] Svaty S, Bocek D, Zielina S, On-line analysis of cleanness characteristics and
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2006, Luxembourg:
