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Optimisation of stirring conditions during vacuum degassing in order to lower inclusion content in tool steel
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
2013 (English)In: Ironmaking & steelmaking, ISSN 0301-9233, E-ISSN 1743-2812, Vol. 40, no 3, 231-237 p.Article in journal (Refereed) Published
Abstract [en]

In the production of tool steel, the control of secondary metallurgy plays an important role to meet the rapidly increasing demands for clean steel, as impurities and non-metallic inclusions can reduce its mechanical properties. This study focuses on the influence of stirring rate during the vacuum degassing of liquid steel on the inclusion characteristics. During this treatment, both gas and induction stirring are used; thus, fluid flow simulations were made for the vacuum treatment of melts at high (900 A + 100 L min(-1) Ar) and low (700 A + 10 L min(-1) Ar) stirring rates. By decreasing the Weber number to a value smaller than the critical value (We(crit)=12.3) at a lower stirring rate, the probability for dispersion and entrapping of slag inclusions into the liquid steel significantly decreases. Five plant heats were carried out with different rates of induction stirring and argon flow in the ladle during vacuum treatment. The results gained by light optical microscopy investigation show that the total amount of large size single inclusions (>11.3 mm) in steel samples after vacuum treatment and in the final product decreases considerably with a lowered stirring rate. Thus, the experimental results support the theoretical results based on the Weber number.

Place, publisher, year, edition, pages
2013. Vol. 40, no 3, 231-237 p.
Keyword [en]
Tool steel, Inclusions, Vacuum treatment, Gas stirring, Induction stirring
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-120279DOI: 10.1179/1743281212Y.0000000037ISI: 000316015800008Scopus ID: 2-s2.0-84876103823OAI: oai:DiVA.org:kth-120279DiVA: diva2:614719
Funder
Vinnova
Note

QC 20130405

Available from: 2013-04-05 Created: 2013-04-04 Last updated: 2017-12-06Bibliographically approved

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