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Sundin, Karl-Gustaf
Publications (10 of 41) Show all publications
Hernandez, S., Leiro, A., Ripoli, M. R., Vuorinen, E., Sundin, K.-G. & Prakash, B. (2016). High temperature three-body abrasive wear of 0.25C 1.42Si steel with carbide free bainitic (CFB) and martensitic microstructures (ed.). Paper presented at . Wear, 360-361, 21-28
Open this publication in new window or tab >>High temperature three-body abrasive wear of 0.25C 1.42Si steel with carbide free bainitic (CFB) and martensitic microstructures
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2016 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 360-361, p. 21-28Article in journal (Refereed) Published
Abstract [en]

In the present work, the wear behaviour of different steels has been investigated under a three body abrasive environment at room and elevated temperatures. High-silicon steel (0.25C-1.42Si) was austempered at 300 and 320 ˚C in order to obtain two carbide-free bainitic steels with different mechanical properties. The same steel subjected to two different quench and temper heat treatments was used as a reference material for mechanical and wear testing. The steels were subjected to three-body abrasive wear by means of a high temperature continuous abrasion tester (HT-CAT). The tests were done at 25, 300 and 500 °C respectively. All samples showed similar wear rates at room temperature. At 500 °C, the material austempered at 320 ˚C showed the highest toughness and the lowest wear rate. High temperature hardness and impact toughness tests showed that abrasive wear is not only influenced by hardness but also by the toughness of the material. Owing to their good strength/toughness combination CFB steels could prove to be an important material for abrasive wear applications

National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear) Other Materials Engineering
Research subject
Machine Elements; Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-9780 (URN)10.1016/j.wear.2016.04.012 (DOI)000378666800003 ()2-s2.0-84964510043 (Scopus ID)8765e5dc-9085-47c6-92ce-d894efee5319 (Local ID)8765e5dc-9085-47c6-92ce-d894efee5319 (Archive number)8765e5dc-9085-47c6-92ce-d894efee5319 (OAI)
Note
Validerad; 2016; Nivå 2; 20160419 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Sjöberg, T., Sundin, K.-G., Kajberg, J. & Oldenburg, M. (2016). Reverse ballistic experiment resembling the conditions in turbine blade off event for containment structures (ed.). Thin-walled structures, 107, 671-677
Open this publication in new window or tab >>Reverse ballistic experiment resembling the conditions in turbine blade off event for containment structures
2016 (English)In: Thin-walled structures, ISSN 0263-8231, E-ISSN 1879-3223, Vol. 107, p. 671-677Article in journal (Refereed) Published
Abstract [en]

An experimental technique has been developed which allows loading of heated sheet material under impact conditions with simultaneous measurement of the impact force history. The combined characteristics of impact loading at elevated temperature makes the experiment ideal for validation of models used to simulate the containment structure surrounding aircraft engines. In this paper experimental results for Alloy 718 are presented, a nickel based super alloy commonly used in hot parts of the containment structure. The experimental results are then compared to simulations in order to validate previously calibrated material parameters. The basic principle of the validation experiment is based on reverse ballistics, in which a thin circular specimen with free boundaries impacts the end of an instrumented rod. Using induction heating the specimen is heated to temperatures up to 650 °C and a gun driven by compressed air accelerates the specimens to desired velocity. In the reported work velocities are kept low enough to avoid cracking and thus the study is limited to plastic conditions, even though the technique is applicable also for fracture studies. The free boundaries of the experiment makes numerical modelling and simulation straightforward, making it valuable as a validation tool. All numerical simulations are performed using the commercial finite element code LS-Dyna and plastic behaviour of the material was modelled with the Johnson-Cook material model

National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-14178 (URN)10.1016/j.tws.2016.07.002 (DOI)000383813200054 ()2-s2.0-84982803960 (Scopus ID)d87e4938-9599-407f-9604-78c6dbbcdf41 (Local ID)d87e4938-9599-407f-9604-78c6dbbcdf41 (Archive number)d87e4938-9599-407f-9604-78c6dbbcdf41 (OAI)
Note

Validerad; 2016; Nivå 2; 20160825 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Sundqvist, J., Kaplan, A., Granström, J., Sundin, K.-G., Keskitalo, M., Mäntyjärvi, K. & Ren, X. (2015). Identifying residual stresses in laser welds by fatigue crack growth acceleration measurement (ed.). Paper presented at . Journal of laser applications, 27(4), Article ID 42002.
Open this publication in new window or tab >>Identifying residual stresses in laser welds by fatigue crack growth acceleration measurement
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2015 (English)In: Journal of laser applications, ISSN 1042-346X, E-ISSN 1938-1387, Vol. 27, no 4, article id 42002Article in journal (Refereed) Published
Abstract [en]

During laser welding, residual stresses are thermally induced. They can have strong impact on the fatigue behavior and fatigue life. A standardized measurement method for the fatigue crack growth rate was expanded to identify residual stress along the cracking path. The second derivative of the measured crack opening and in turn the crack acceleration corresponded well with distinct acceleration maxima and minima and accordingly with tensile and compressive stress, as was basically proven by numerical simulation. The method is simple and extendable. It provides valuable information, as was demonstrated for various situations.

National Category
Manufacturing, Surface and Joining Technology Applied Mechanics
Research subject
Manufacturing Systems Engineering; Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-10852 (URN)10.2351/1.4923472 (DOI)000362569000002 ()2-s2.0-84936882579 (Scopus ID)9bb76bdd-9c0b-4c71-8a47-fc833d81bb4e (Local ID)9bb76bdd-9c0b-4c71-8a47-fc833d81bb4e (Archive number)9bb76bdd-9c0b-4c71-8a47-fc833d81bb4e (OAI)
Note
Validerad; 2015; Nivå 2; 20151102 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Leiro, A., Roshan, A., Sundin, K.-G., Prakash, B. & Vuorinen, E. (2014). Fatigue of 0.55C-1.72Si Steel with Tempered Martensitic and Carbide-Free Bainitic Microstructures (ed.). Acta Metallurgica Sinica (English Letters), 27(1), 55-62
Open this publication in new window or tab >>Fatigue of 0.55C-1.72Si Steel with Tempered Martensitic and Carbide-Free Bainitic Microstructures
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2014 (English)In: Acta Metallurgica Sinica (English Letters), ISSN 1006-7191, E-ISSN 2194-1289, Vol. 27, no 1, p. 55-62Article in journal (Refereed) Published
Abstract [en]

High-Si spring steel was heat treated in three different ways: Quenching and tempering at 460 °C to obtain a tempered martensite microstructure, and austempering at 300 and 350 °C, respectively, to obtain two different carbide-free bainitic microstructures. In the steel austempered at 350 °C, both the bainite lath thickness and retained austenite content were higher than those of the steel austempered at 300 °C. Rotating-bending fatigue tests were done in order to evaluate the effect of each heat treatment on the high-cycle fatigue behavior of the steel. When the austempering temperature was 300 °C, the endurance limit was increased by 25% despite a 5% reduction in tensile strength when compared with that of the quenched and tempered steel. The relationship between endurance limit [Rfat (50%)] and ultimate tensile strength (Rm) was higher for the austempered samples in comparison with that of the quenched and tempered material. Therefore, it is believed that the presence of retained austenite affects the relationship between endurance limit and tensile strength.

National Category
Other Materials Engineering Applied Mechanics Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Engineering Materials; Solid Mechanics; Machine Elements; Centre - Centre for High Performance Steel (CHS)
Identifiers
urn:nbn:se:ltu:diva-6071 (URN)10.1007/s40195-013-0020-4 (DOI)000333727900008 ()2-s2.0-84900630234 (Scopus ID)445075f9-f36e-499d-bf30-07af86c43d98 (Local ID)445075f9-f36e-499d-bf30-07af86c43d98 (Archive number)445075f9-f36e-499d-bf30-07af86c43d98 (OAI)
Note

Validerad; 2014; 20140129 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2019-03-29Bibliographically approved
Kajberg, J. & Sundin, K.-G. (2014). High-Temperature Split-Hopkinson Pressure Bar with a Momentum Trap for Obtaining Flow Stress Behaviour and Dynamic Recrystallisation (ed.). Paper presented at . Strain, 50(6), 547-554
Open this publication in new window or tab >>High-Temperature Split-Hopkinson Pressure Bar with a Momentum Trap for Obtaining Flow Stress Behaviour and Dynamic Recrystallisation
2014 (English)In: Strain, ISSN 0039-2103, E-ISSN 1475-1305, Vol. 50, no 6, p. 547-554Article in journal (Refereed) Published
Abstract [en]

In hot forming processes at elevated temperatures like wire rolling, microstructural changes such as repeated dynamic recrystallisation and grain growth occur. An experimental method to obtain the flow stress behaviour and to capture the recrystallised microstructure for materials subjected to large deformations, high temperatures between 900 and 1200 °C and high strain rates around 5000 s− 1 is presented. The method is based on the split-Hopkinson pressure bar arrangement complemented with an inductive heat source. Furthermore, a momentum trap is added to ensure that the specimen is loaded only once. By quenching the specimen directly after the single loading, the dynamically recrystallised microstructure is preserved. The quenching is performed within 0.1 s of loading by dropping the specimen into a water bath. By applying the momentum trap technique, the compressive loading of the specimen could be interrupted at a strain level slightly above the strain level corresponding to the peak stress, which is a good estimation for the onset of dynamic recrystallisation.

National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-3589 (URN)10.1111/str.12115 (DOI)000344872600007 ()2-s2.0-84909631691 (Scopus ID)16a91c2b-95f7-47f9-9119-50d3dfcd37d4 (Local ID)16a91c2b-95f7-47f9-9119-50d3dfcd37d4 (Archive number)16a91c2b-95f7-47f9-9119-50d3dfcd37d4 (OAI)
Note
Validerad; 2014; 20141024 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Sjöberg, T., Sundin, K.-G. & Oldenburg, M. (2013). Calibration and validation of plastic high strain rate models for alloy 718 (ed.). In: (Ed.), E. Oñate; D.R.J. Owen; D. Peric; B. Suárez (Ed.), Computational Plasticity XII: . Paper presented at International Conference on Computational Plasticity. Fundamentals and Applications : 03/09/2013 - 05/09/2013 (pp. 469-479). Barcelona
Open this publication in new window or tab >>Calibration and validation of plastic high strain rate models for alloy 718
2013 (English)In: Computational Plasticity XII / [ed] E. Oñate; D.R.J. Owen; D. Peric; B. Suárez, Barcelona, 2013, p. 469-479Conference paper, Published paper (Refereed)
Abstract [en]

Alloy 718 (Inconel™ 718), composed mainly of nickel, iron and chromium has properties that are of interest in many high temperature applications. One such application is the containment structure in aero engines which prevents fragments from penetrating the structure in case of blade failure. Impact of blade fragments on the containment structure includes both high strain rates and high temperatures and simulation models must therefore have their base in experimental conditions including transient loading and heating. An experimental method has been developed that utilizes induction heating in a high rate tensile test machine. Strain rates up to the order of 1000 s-1 and temperatures up to 650 °C have been included in the test program. Material parameters for the Johnson-Cook and the Zerilli-Armstrong models are evaluated from experimental data using optimisation. These parameters are then used to simulate a specially designed impact experiment and a direct comparison of a calculated and measured quantity can be made in order to validate model and parameters. The result from the validation experiment showed better agreement for the Johnson-Cook model than the Zerilli-Armstrong model

Place, publisher, year, edition, pages
Barcelona: , 2013
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-27449 (URN)0e719951-985e-4bc7-b1c1-6c0f49130f5d (Local ID)9788494153150 (ISBN)0e719951-985e-4bc7-b1c1-6c0f49130f5d (Archive number)0e719951-985e-4bc7-b1c1-6c0f49130f5d (OAI)
Conference
International Conference on Computational Plasticity. Fundamentals and Applications : 03/09/2013 - 05/09/2013
Note
Godkänd; 2013; 20131217 (tedsjo)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Sundin, K.-G., Granström, J. & Oldenburg, M. (2013). Experimental investigation of plastic and fracture behaviour of 22MnB5 at hot stamping conditions (ed.). In: (Ed.), Mats Oldenburg; Braham Prakash; Kurt Steinhoff (Ed.), 4th International Conference Hot Sheet Metal Forming of High-performance Steel CHS: June 9-12, Luleå, Sweden : Proceedings. Paper presented at International Conference on Hot Sheet Metal Forming of High-Performance Steel : 09/06/2013 - 12/06/2013 (pp. 557-564). Auerbach: Verlag Wissenschaftliche Scripten
Open this publication in new window or tab >>Experimental investigation of plastic and fracture behaviour of 22MnB5 at hot stamping conditions
2013 (English)In: 4th International Conference Hot Sheet Metal Forming of High-performance Steel CHS: June 9-12, Luleå, Sweden : Proceedings / [ed] Mats Oldenburg; Braham Prakash; Kurt Steinhoff, Auerbach: Verlag Wissenschaftliche Scripten , 2013, p. 557-564Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Auerbach: Verlag Wissenschaftliche Scripten, 2013
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-40068 (URN)f0bef510-5ee5-4322-9615-237d947efa7b (Local ID)9783942267823 (ISBN)f0bef510-5ee5-4322-9615-237d947efa7b (Archive number)f0bef510-5ee5-4322-9615-237d947efa7b (OAI)
Conference
International Conference on Hot Sheet Metal Forming of High-Performance Steel : 09/06/2013 - 12/06/2013
Note
Godkänd; 2013; 20130612 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
Kajberg, J. & Sundin, K.-G. (2013). Material characterisation using high-temperature Split Hopkinson pressure bar (ed.). Paper presented at . Journal of Materials Processing Technology, 213(4), 522-531
Open this publication in new window or tab >>Material characterisation using high-temperature Split Hopkinson pressure bar
2013 (English)In: Journal of Materials Processing Technology, ISSN 0924-0136, E-ISSN 1873-4774, Vol. 213, no 4, p. 522-531Article in journal (Refereed) Published
Abstract [en]

In order to characterise the mechanical response of materials in manufacturing processes, such as wire and bar rolling involving very high strain rates, temperatures and level of straining, an experimental device is presented. The device is suitable for testing at strain rates up to approximately 4000 s−1, temperatures up to 1200 °C (≈1500 K) and strains around 0.5. It is based on the classical split Hopkinson pressure bar and is complemented with an inductive heating source for achieving requested temperatures. By keeping the specimen separated from the Hopkinson bars just until an instant before impact (50 ms) considerable cooling and temperature gradients in the specimen are avoided. Three steel grades, two stainless steels and a high-speed steel, were tested. Four different material models whose parameters were fitted to the obtained experimental data were used for mechanical characterisation: two empirically based and two physically based. Overall, one of the physically based models showed the best agreement between experimental results and the predicted flow stresses.

National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-13139 (URN)10.1016/j.jmatprotec.2012.11.008 (DOI)000315311300002 ()2-s2.0-84870987269 (Scopus ID)c50d951c-7287-4631-a2f1-353712c7913a (Local ID)c50d951c-7287-4631-a2f1-353712c7913a (Archive number)c50d951c-7287-4631-a2f1-353712c7913a (OAI)
Note
Validerad; 2013; 20121120 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Sundqvist, J., Eriksson, I., Kaplan, A., Keskitalo, M., Mäntyjärvi, K., Granström, J. & Sundin, K.-G. (2013). Measuring the influence of laser welding on fatigue crack propagation in high strength steel (ed.). In: (Ed.), (Ed.), ICALEO, 32nd International Congress on Applications of Lasers & Electro-Optics: October 6-10, 2013, Hyatt Regency Miami, Miami, FL USA. Orlando, Fl.: Laser institute of America
Open this publication in new window or tab >>Measuring the influence of laser welding on fatigue crack propagation in high strength steel
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2013 (English)In: ICALEO, 32nd International Congress on Applications of Lasers & Electro-Optics: October 6-10, 2013, Hyatt Regency Miami, Miami, FL USA, Orlando, Fl.: Laser institute of America , 2013Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Orlando, Fl.: Laser institute of America, 2013
National Category
Manufacturing, Surface and Joining Technology Applied Mechanics
Research subject
Manufacturing Systems Engineering; Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-32582 (URN)71e189df-916a-46ad-b3dd-d218b42014d4 (Local ID)978-0-912035-98-7 (ISBN)71e189df-916a-46ad-b3dd-d218b42014d4 (Archive number)71e189df-916a-46ad-b3dd-d218b42014d4 (OAI)
Note
Godkänd; 2013; 20151117 (jessun)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Leiro, A., Vuorinen, E., Sundin, K.-G., Prakash, B., Sourmail, T., Samanio, V., . . . Elvira, R. (2013). Wear of nano-structured carbide-free bainitic steels under dry rolling-sliding conditions (ed.). Wear, 298-299(1), 42-47
Open this publication in new window or tab >>Wear of nano-structured carbide-free bainitic steels under dry rolling-sliding conditions
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2013 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 298-299, no 1, p. 42-47Article in journal (Refereed) Published
Abstract [en]

Specially designed steels with carbon contents from 0.6 to 1.0 wt.% were isothermally transformed at very low temperatures, between 220 and 270 °C, in order to obtain a nano-structured bainitic microstructure. It is shown that the wear resistance in dry rolling-sliding of these nano-structured steels is significantly superior to that ofbainitic steels transformed at higher temperatures with similar hardness values.In addition to the highly refined microstructure, the transformation under strain to martensite (TRIP effect), contributes to the plasticity of the nano-scaled steels, increasing surface hardness during testing, thus reducing the wear rate.

National Category
Other Materials Engineering Applied Mechanics Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Engineering Materials; Solid Mechanics; Machine Elements; Centre - Centre for High Performance Steel (CHS)
Identifiers
urn:nbn:se:ltu:diva-6800 (URN)10.1016/j.wear.2012.11.064 (DOI)000316427200006 ()2-s2.0-84872813634 (Scopus ID)518a4782-f740-4041-894d-77e7f8e9b6a0 (Local ID)518a4782-f740-4041-894d-77e7f8e9b6a0 (Archive number)518a4782-f740-4041-894d-77e7f8e9b6a0 (OAI)
Note

Validerad; 2013; 20121207 (ysko)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2019-03-29Bibliographically approved
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