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A Study of the Oscillation Marks’ Characteristics of Continuously Cast Incoloy Alloy 825 Blooms
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Casting of Metals.ORCID iD: 0000-0001-9437-3550
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Casting of Metals.ORCID iD: 0000-0002-8318-1251
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Casting of Metals.ORCID iD: 0000-0003-2449-9232
2016 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 47, no 8, 4068-4079 p.Article in journal (Refereed) Published
Abstract [en]

A comprehensive experimental study of oscillation mark (OM) formation and its characteristics during the solidification of Incoloy alloy 825 in the continuous casting of blooms is investigated by plant trials and metallographic study. The experiments involved two heats with the same casting and mold conditions and sampling at different locations across the strand. The metallographic study combined macro/micro-examinations of OMs and segregation analysis of Cr, Mn, Mo, Ni, and Si by microprobe analysis. The results show that OMs have widely different characteristics, such as mark type, depth, segregation, and accompanying microstructure. Furthermore, the mark pitch can vary considerably even for the similar casting conditions, leading to different conditions for the marks’ formation in relation to the mold’s cyclic movement. Finally, a mechanism for the OM formation is discussed and proposed. Possible solutions for minimizing the observed defects by optimizing the mold conditions are suggested.

Place, publisher, year, edition, pages
Springer Publishing Company, 2016. Vol. 47, no 8, 4068-4079 p.
Keyword [en]
Incoloy alloy 825, continuous casting, bloom, oscillations marks, microstructure, microsegregation, cracks, statistical analysis
National Category
Other Materials Engineering
Research subject
Materials Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-187818DOI: 10.1007/s11661-016-3582-8ISI: 000379494700027ScopusID: 2-s2.0-84978160768OAI: oai:DiVA.org:kth-187818DiVA: diva2:931688
Projects
Reduction of oscillation marks formation
Funder
Swedish Energy Agency
Note

QC 20160530

Available from: 2016-05-30 Created: 2016-05-30 Last updated: 2016-08-15Bibliographically approved
In thesis
1. On the surface quality of continuously cast steels and phosphor bronzes
Open this publication in new window or tab >>On the surface quality of continuously cast steels and phosphor bronzes
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis work concerns about the importance of the cast surfaces, surface phenomenon such as the formation of the oscillation marks and exudation and related defects including cracks and segregation that happened during the continuous casting. All of the investigated materials were collected during the plant trials while an in-depth analysis on these materials was performed at the laboratory scale with certain explanations supported by the schematic and theoretical models. The work consists on different material classes such as steels and phosphor bronzes with a focus on the surface defects and their improvements. In order to facilitate the theoretical analysis which could be capable of explaining the suggested phenomenon in the thesis, a reduced model is developed which required lesser computational resources with lesser convergence problems.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. 80 p.
Keyword
Continuous Casting, Steels, Ni-based alloy, Peritectic, Phosphor Bronzes, Simulation and Modeling
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering; Industrial Engineering and Management; Metallurgical process science
Identifiers
urn:nbn:se:kth:diva-187718 (URN)978-91-7729-019-3 (ISBN)
Public defence
2016-06-09, Kollegiesalen, Brinellvägen 8, SE-10044, KTH-Campus, Stockholm, 14:00 (English)
Opponent
Supervisors
Projects
Oscilation mark formation during continous casting of steel
Funder
Swedish Energy AgencyVINNOVAHelge Ax:son Johnsons stiftelse
Note

QC 20160527

Available from: 2016-05-30 Created: 2016-05-27 Last updated: 2016-05-30Bibliographically approved

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