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Ion, John
Publications (10 of 27) Show all publications
Vuorinen, E., Gülfem Özügürler, A., Ion, J., Eriksson, K., Chandra Somani, M., Pentti Karjalainen, L., . . . Garcia Caballero, F. (2019). Hot Forming of Ultra-Fine-Grained Multiphase Steel Products Using Press Hardening Combined with Quenching and Partitioning Process. Metals, 9(3), Article ID 357.
Open this publication in new window or tab >>Hot Forming of Ultra-Fine-Grained Multiphase Steel Products Using Press Hardening Combined with Quenching and Partitioning Process
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2019 (English)In: Metals, ISSN 2075-4701, Vol. 9, no 3, article id 357Article in journal (Refereed) Published
Abstract [en]

Hot forming combined with austempering and quenching and partitioning (QP) processes have been used to shape two cold rolled high silicon steel sheets into hat profiles. Thermal simulation on a Gleeble instrument was employed to optimize processing variables to achieve an optimum combination of strength and ductility in the final parts. Microstructures were characterized using optical and scanning electron microscopy and X-ray diffraction. Tensile strengths (Rm) of 1190 and 1350 MPa and elongations to fracture (A50mm) of 8.5 and 7.4%, were achieved for the two high-silicon steels having 0.15 and 0.26 wt % C, respectively. Preliminary results show that press hardening together with a QP heat treatment is an effective method of producing components with high strength and reasonable tensile ductility from low carbon containing steels that have the potential for carbide free bainite formation. The QP treatment resulted in faster austenite decomposition during partitioning in the steels in comparison with an austempering treatment.

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
hot forming, multiphase steel, quenching and partitioning, austempering, Gleeble simulation, press hardening
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-73787 (URN)10.3390/met9030357 (DOI)000464321200008 ()2-s2.0-85064219072 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-04-30 (johcin)

Available from: 2019-04-30 Created: 2019-04-30 Last updated: 2019-04-30Bibliographically approved
Stjernberg, J., Nordin, L.-O. & Ion, J. (2015). Evaluation of refractory castables and coatings used in the pre-heat zone of a grate-kiln for iron ore pellet production (ed.). Paper presented at . Ironmaking & steelmaking, 42(4), 274-281
Open this publication in new window or tab >>Evaluation of refractory castables and coatings used in the pre-heat zone of a grate-kiln for iron ore pellet production
2015 (English)In: Ironmaking & steelmaking, ISSN 0301-9233, E-ISSN 1743-2812, Vol. 42, no 4, p. 274-281Article in journal (Refereed) Published
Abstract [en]

Iron ore pellets are a prepared burden material for ironmaking that are commonly sintered in a grate kiln furnace system. Deposited material can adhere in chunks to localised regions of the lining of such furnaces, causing lining depletion. Such deposits consist mainly of iron oxides, but alkali, alkaline earth and other oxides formed from disintegrated pellets and fly ash may also be present. In order to investigate methods of preventing such formations, tests have been performed using several different castables and coatings. Samples of liner castables with and without coatings, installed in an industrial furnace, were collected after 6 and 24 months in production use, and characterised using scanning electron microscopy to identify the materials, characterise morphological changes at the deposit-coating-lining interface, and to determine the active chemical reactions. An Al2O3 based coating applied to one of the fields was found to be in good condition after 6 months in use, but no traces of the coating were observed after 24 months in use. A carbon phosphate based coating was not intact after 6 months in use; it was probably burned-up as a result of the oxidising atmosphere. Hematite grains from the deposit material remained at the original deposit-lining interface, while calcium migrated further into the lining.

National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-11336 (URN)10.1179/1743281214Y.0000000226 (DOI)000353708600006 ()2-s2.0-84980377988 (Scopus ID)a47953f7-b558-47d2-a001-52bf9b8739e3 (Local ID)a47953f7-b558-47d2-a001-52bf9b8739e3 (Archive number)a47953f7-b558-47d2-a001-52bf9b8739e3 (OAI)
Note
Validerad; 2015; Nivå 2; 20140908 (jessje)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Stjernberg, J., Isaksson, O. & Ion, J. (2015). The grate-kiln induration machine: history, advantages, and drawbacks, and outline for the future (ed.). The Journal of The Southern African Institute of Mining and Metallurgy, 115(2), 137-144
Open this publication in new window or tab >>The grate-kiln induration machine: history, advantages, and drawbacks, and outline for the future
2015 (English)In: The Journal of The Southern African Institute of Mining and Metallurgy, ISSN 2411-9717, Vol. 115, no 2, p. 137-144Article in journal (Refereed) Published
Abstract [en]

Iron ore pellets are a preferred feedstock for ironmaking. One method used for pelletizing is the grate-kiln process, first established in 1960. During the past decade, the establishment of new grate-kiln plants has increased rapidly, especially in China, and new constructors of pellet plants have started to operate in the market. It is well known that the grate-kiln method yields a superior and more consistent pellet quality compared with the straight-grate process. However, certain issues exist with the grate-kiln plant, which are discussed here, together with proposed practical solutions.

National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-4040 (URN)1e5ae2e2-274d-4367-8943-d49c4762db5f (Local ID)1e5ae2e2-274d-4367-8943-d49c4762db5f (Archive number)1e5ae2e2-274d-4367-8943-d49c4762db5f (OAI)
Note

Validerad; 2015; Nivå 2; 20150219 (jessje)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-02-15Bibliographically approved
Fisk, M., Ion, J. & Lindgren, L.-E. (2014). Flow stress model for IN718 accounting for evolution of strengthening precipitates during thermal treatment (ed.). Paper presented at . Computational materials science, 82, 531-539
Open this publication in new window or tab >>Flow stress model for IN718 accounting for evolution of strengthening precipitates during thermal treatment
2014 (English)In: Computational materials science, ISSN 0927-0256, E-ISSN 1879-0801, Vol. 82, p. 531-539Article in journal (Refereed) Published
Abstract [en]

A flow stress model describing precipitate hardening in the nickel based alloy Inconel® 718 following thermal treatment is presented. The interactions between precipitates and dislocations are included in a dislocation density based material model. Compression tests have been performed using solution annealed, fully-aged and half-aged material. Models were calibrated using data for solution annealed and fully-aged material, and validated using data from half-aged material. Agreement between experimental data and model predictions is good.

National Category
Other Materials Engineering
Research subject
Material Mechanics
Identifiers
urn:nbn:se:ltu:diva-13533 (URN)10.1016/j.commatsci.2013.10.007 (DOI)000327533300073 ()2-s2.0-84889101478 (Scopus ID)cc0ad61a-ff01-4f0c-ae05-ddbf9bbaf698 (Local ID)cc0ad61a-ff01-4f0c-ae05-ddbf9bbaf698 (Archive number)cc0ad61a-ff01-4f0c-ae05-ddbf9bbaf698 (OAI)
Note
Validerad; 2014; 20131112 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Stjernberg, J., Olivas-Ogaz, M., Antti, M.-L., Ion, J. & Lindblom, B. (2013). Laboratory scale study of the degradation of mullite/corundum refractories by reaction with alkali-doped deposit materials (ed.). Ceramics International, 39(1), 791-800
Open this publication in new window or tab >>Laboratory scale study of the degradation of mullite/corundum refractories by reaction with alkali-doped deposit materials
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2013 (English)In: Ceramics International, ISSN 0272-8842, E-ISSN 1873-3956, Vol. 39, no 1, p. 791-800Article in journal (Refereed) Published
Abstract [en]

Refractory bricks based on mullite and corundum, commonly used in rotary kilns for iron ore pellet production, and depositmaterial from an iron ore pellet production kiln, were used in laboratoryscale tests to investigate refractory/depositreactions and the infiltration of deposit components into the refractory bricks. The materials tested were in both monolithic form and in the form of powder. Alkali metal carbonates (containing sodium and potassium) were used as corrosive agents, to increase reaction kinetics. The morphological changes and active chemical reactions at the refractory/deposit interface in the samples were characterized by scanning electron microscopy. X-ray diffraction showed that alkali metals react with the mullite in the bricks, this being more pronounced in the case of sodium than potassium. Phases such as nepheline (Na2O·Al2O3·2SiO2), kalsilite and kaliophilite (both K2O·Al2O3·2SiO2), and leucite (K2O·Al2O3·4SiO2) were formed as a consequence of reactions between alkali metals and the refractory bricks. The formation of these phases causes volume expansions of between 20% and 25% in the brick materials, which accelerate degradation.

National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-4093 (URN)10.1016/j.ceramint.2012.06.094 (DOI)000315246300101 ()2-s2.0-84869090211 (Scopus ID)1f657a6a-588a-4cca-8db6-2c180356ceae (Local ID)1f657a6a-588a-4cca-8db6-2c180356ceae (Archive number)1f657a6a-588a-4cca-8db6-2c180356ceae (OAI)
Note

Validerad; 2013; 20120731 (ysko)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-08-23Bibliographically approved
Stjernberg, J., Ion, J., Antti, M.-L., Nordin, L.-O., Lindblom, B. & Odén, M. (2012). Extended studies of degradation mechanisms in the refractory lining of a rotary kiln for iron ore pellet production (ed.). Paper presented at . Journal of the European Ceramic Society, 32(8), 1519-1528
Open this publication in new window or tab >>Extended studies of degradation mechanisms in the refractory lining of a rotary kiln for iron ore pellet production
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2012 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 32, no 8, p. 1519-1528Article in journal (Refereed) Published
Abstract [en]

Changes, over a period of 8 years, in the chemical composition and morphology of deposit and lining materials in a production rotary kiln for iron ore pellet manufacture are described. The following have been studied: two types of refractory brick used as lining material; deposited chunk materials from the lining; the interaction zones between deposits and linings. Morphological changes at the deposit/lining interface, and the active chemical reactions, are established. Larger hematite grains in the deposit material (5–50 μm) primarily remain at the original deposit/lining interface. The remainder penetrates fissures, voids and brick joints, forms a laminar structure with corundum from the bricks, and migrates in grains in the lining material. Potassium penetrates more deeply into the bricks than hematite, resulting in the formation of kalsilite, leucite and potassium β-alumina, which contribute to degradation of the lining.

National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-9458 (URN)10.1016/j.jeurceramsoc.2012.01.012 (DOI)000303279600007 ()2-s2.0-84858701944 (Scopus ID)818e7c3a-6f72-4ca0-b9f5-ae7c6874d543 (Local ID)818e7c3a-6f72-4ca0-b9f5-ae7c6874d543 (Archive number)818e7c3a-6f72-4ca0-b9f5-ae7c6874d543 (OAI)
Note
Validerad; 2012; 20120208 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Ion, J. & Ashby, M. F. (2012). Weldability charts for constructional steels (ed.). In: (Ed.), (Ed.), 6th EEIGM International Conference Advanced Materials Research: 7th and 8th November, 2011 EEIGM, Nancy, France. Paper presented at EEIGM International Conference on Advanced Materials Research : 11/06/2015 - 12/06/2015. Bristol: IOP Publishing Ltd
Open this publication in new window or tab >>Weldability charts for constructional steels
2012 (English)In: 6th EEIGM International Conference Advanced Materials Research: 7th and 8th November, 2011 EEIGM, Nancy, France, Bristol: IOP Publishing Ltd , 2012Conference paper, Published paper (Refereed)
Abstract [en]

The weldability of materials is still a poorly understood concept; a quantitative assessment remains elusive. The variables associated with welding are reduced here into two groups - processing parameters and material properties - from which two characteristic indices are defined and used as the basis of weldability charts. For the case of constructional steels, a carbon equivalent characterises both heat affected zone hardenability and the maximum hardness developed after solid state phase transformations. The welding process is characterised by its energy input. A mathematical model is used to establish relationships between the indices, which are displayed on charts as contours of microstructure and hardness.

Place, publisher, year, edition, pages
Bristol: IOP Publishing Ltd, 2012
Series
I O P Conference Series: Materials Science and Engineering, ISSN 1757-8981 ; 31
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-38452 (URN)10.1088/1757-899X/31/1/012011 (DOI)000306212500011 ()2-s2.0-84859833051 (Scopus ID)cdc040f1-c2de-4d46-9aba-084d67792268 (Local ID)cdc040f1-c2de-4d46-9aba-084d67792268 (Archive number)cdc040f1-c2de-4d46-9aba-084d67792268 (OAI)
Conference
EEIGM International Conference on Advanced Materials Research : 11/06/2015 - 12/06/2015
Note
Validerad; 2012; Bibliografisk uppgift: Article number 012011; 20111206 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-07-10Bibliographically approved
Stjernberg, J., Antti, M.-L., Ion, J. & Lindblom, B. (2011). Lab scale study of the depletion of mullite/corundum-based refractories trough reaction with scaffold materials (ed.). In: (Ed.), (Ed.), IOP Conference Series: Materials Science and Engineering: Symposium 16, 2011 (222001-222031) Innovation in Refractories and Traditional Ceramics. Paper presented at International Congress on Ceramics : 14/11/2010 - 18/11/2010. : IOP Publishing Ltd, 18, Article ID 222004.
Open this publication in new window or tab >>Lab scale study of the depletion of mullite/corundum-based refractories trough reaction with scaffold materials
2011 (English)In: IOP Conference Series: Materials Science and Engineering: Symposium 16, 2011 (222001-222031) Innovation in Refractories and Traditional Ceramics, IOP Publishing Ltd , 2011, Vol. 18, article id 222004Conference paper, Published paper (Refereed)
Abstract [en]

To investigate the mechanisms underlying the depletion of mullite/corundum-based refractory bricks used in rotary kilns for iron ore pellet production, the reaction mechanisms between scaffold material and refractory bricks have been studied on the laboratory-scale. Alkali additions were used to enhance the reaction rates between the materials. The morphological changes and active chemical reactions at the refractory/scaffold material interface in the samples were characterized using scanning electron microscopy (SEM), thermal analysis (TA) and X-ray diffraction (XRD). No reaction products of alkali and hematite (Fe2O3) were detected; however, alkali dissolves the mullite in the bricks. Phases such as nepheline (Na2OAl2O32SiO2), kalsilite (K2OAl2O32SiO2), leucite (K2OAl2O34SiO2) and potassium β-alumina (K2O11Al2O3) were formed as a consequence of reactions between alkali and the bricks.

Place, publisher, year, edition, pages
IOP Publishing Ltd, 2011
Series
I O P Conference Series: Materials Science and Engineering, ISSN 1757-8981 ; 16
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-38848 (URN)10.1088/1757-899X/18/22/222004 (DOI)000295803200004 ()2-s2.0-84899003238 (Scopus ID)d5d40b0f-19ae-4e56-ae4e-1cfe61c97660 (Local ID)d5d40b0f-19ae-4e56-ae4e-1cfe61c97660 (Archive number)d5d40b0f-19ae-4e56-ae4e-1cfe61c97660 (OAI)
Conference
International Congress on Ceramics : 14/11/2010 - 18/11/2010
Note
Validerad; 2011; 20110920 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-07-10Bibliographically approved
Ion, J. (2005). Laser processing of engineering materials: principles, procedure and industrial application (ed.). Paper presented at . Amsterdam: Butterworth-Heinemann
Open this publication in new window or tab >>Laser processing of engineering materials: principles, procedure and industrial application
2005 (English)Book (Other academic)
Place, publisher, year, edition, pages
Amsterdam: Butterworth-Heinemann, 2005. p. 556
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-16452 (URN)2767fb10-f234-11dd-ae0d-000ea68e967b (Local ID)0-7506-6079-1 (ISBN)2767fb10-f234-11dd-ae0d-000ea68e967b (Archive number)2767fb10-f234-11dd-ae0d-000ea68e967b (OAI)
Note
Godkänd; 2005; 20090203 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Jansson, A., Ion, J. & Kujanpää, V. (2003). Co2 and Nd:YAG laser cladding using Stellite 6 (ed.). In: (Ed.), (Ed.), Surface Modification, Cladding, and Protoyping: . Paper presented at International Symposium on High-Power Laser Macroprocessing : 27/05/2002 - 31/05/2002 (pp. 475-480). Bellingham: SPIE - International Society for Optical Engineering
Open this publication in new window or tab >>Co2 and Nd:YAG laser cladding using Stellite 6
2003 (English)In: Surface Modification, Cladding, and Protoyping, Bellingham: SPIE - International Society for Optical Engineering, 2003, p. 475-480Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Bellingham: SPIE - International Society for Optical Engineering, 2003
Series
Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X ; 4831
Identifiers
urn:nbn:se:ltu:diva-27408 (URN)10.1117/12.497603 (DOI)0d973890-f207-11dd-ae0d-000ea68e967b (Local ID)0d973890-f207-11dd-ae0d-000ea68e967b (Archive number)0d973890-f207-11dd-ae0d-000ea68e967b (OAI)
Conference
International Symposium on High-Power Laser Macroprocessing : 27/05/2002 - 31/05/2002
Note
Upprättat; 2003; 20090203 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
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