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Johansson, Sten
Publications (10 of 173) Show all publications
Zhang, P., Peng, R. L., Li, X.-H. & Johansson, S. (2018). Investigation of Element Effect on High-Temperature Oxidation of HVOF NiCoCrAlX Coatings. Coatings, 8(4), 129-145
Open this publication in new window or tab >>Investigation of Element Effect on High-Temperature Oxidation of HVOF NiCoCrAlX Coatings
2018 (English)In: Coatings, ISSN 2079-6412, Vol. 8, no 4, p. 129-145Article in journal (Refereed) Published
Abstract [sv]

MCrAlX (M: Ni or Co or both, X: minor elements) coatings have been used widely to protect hot components in gas turbines against oxidation and heat corrosion at high temperatures. Understanding the influence of the X-elements on oxidation behavior is important in the design of durable MCrAlX coatings. In this study, NiCoCrAlX coatings doped with Y + Ru and Ce, respectively, were deposited on an Inconel-792 substrate using high velocity oxygen fuel (HVOF). The samples were subjected to isothermal oxidation tests in laboratory air at 900, 1000, and 1100 °C and a cyclic oxidation test between 100 and 1100 °C with a 1-h dwell time at 1100 °C. It was observed that the coating with Ce showed a much higher oxidation rate than the coating with Y + Ru under both isothermal and cyclic oxidation tests. In addition, the Y + Ru-doped coating showed significantly lower β phase depletion due to interdiffusion between the coating and the substrate, resulting from the addition of Ru. Simulation results using a moving phase boundary model and an established oxidation-diffusion model showed that Ru stabilized β grains, which reduced β-depletion of the coating due to substrate interdiffusion. This paper, combining experiment and simulation results, presents a comprehensive study of the influence of Ce and Ru on oxidation behavior, including an investigation of the microstructure evolution in the coating surface and the coating-substrate interface influenced by oxidation time.

Place, publisher, year, edition, pages
M D P I AG, 2018
Keywords
MCrAlX coatings, Ruthenium, Cerium, Oxidation, Simulation
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-148278 (URN)10.3390/coatings8040129 (DOI)000434378700004 ()
Note

Funding agencies: Carl Tryggers Stifelsen [CTS16:207]; Swedish Research Council [VR-2014-3079]; Erling-Persson Family Foundation [2017-10-09]; Promobilia Foundation [F17603]

Available from: 2018-06-05 Created: 2018-06-05 Last updated: 2018-06-28Bibliographically approved
Calmunger, M., Chai, G., Eriksson, R., Johansson, S. & Moverare, J. J. (2017). Characterization of austenitic stainless steels deformed at elevated temperature. Metallurgical and Materials Transactions. A, 48A(10), 4525-4538
Open this publication in new window or tab >>Characterization of austenitic stainless steels deformed at elevated temperature
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2017 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 48A, no 10, p. 4525-4538Article in journal (Refereed) Published
Abstract [en]

Highly alloyed austenitic stainless steels are promising candidates to replace more expansive nickel-based alloys within the energy-producing industry. The present study investigates the deformation mechanisms by microstructural characterisation, mechanical properties and stress-strain response of three commercial austenitic stainless steels and two commercial nickel-based alloys using uniaxial tensile tests at elevated temperatures from 400 C up to 700 C. The materials showed different influence of temperature on ductility, where the ductility at elevated temperatures increased with increasing nickel and solid solution hardening element content. The investigated materials showed planar dislocation driven deformation at elevated temperature. Scanning electron microscopy showed that deformation twins were an active deformation mechanism in austenitic stainless steels during tensile deformation at elevated temperatures up to 700 C.

Place, publisher, year, edition, pages
Springer-Verlag New York, 2017
Keywords
Austenitic stainless steel, Nickel-based alloy, Microstructural characterization, Deformation twinning, Stress-strain response
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-122942 (URN)10.1007/s11661-017-4212-9 (DOI)000408884300012 ()
Note

Previous status of this publication was manuscript

Funding agencies: AB Sandvik Materials Technology in Sweden; Swedish National Energy Administration through the Research Consortium of Materials Technology for Thermal Energy Processes [KME-701]; AFM Strategic Faculty Grant SFO-MAT-LiU at Linkoping University [2009-00971]

Available from: 2015-11-30 Created: 2015-11-30 Last updated: 2017-09-22Bibliographically approved
Chen, Z., Peng, R. L., Zhou, J., Bushlya, V., Saoubi, R. M., Johansson, S. & Moverare, J. (2017). Effect of Cutting Conditions on Machinability of AD 730 TM during High Speed Turning with PCBN Tools. In: : . Paper presented at EUROMAT17, Thessaloniki 17-21 September 2017,Greece (pp. 1-1).
Open this publication in new window or tab >>Effect of Cutting Conditions on Machinability of AD 730 TM during High Speed Turning with PCBN Tools
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2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-143973 (URN)
Conference
EUROMAT17, Thessaloniki 17-21 September 2017,Greece
Available from: 2018-01-01 Created: 2018-01-01 Last updated: 2018-08-02Bibliographically approved
Zhang, P., Peng, R. L., Li, X.-H. & Johansson, S. (2017). Hot Corrosion Behavior of HVOF CoNiCrAlY(Hf) Coating on Ni-based Superalloys. In: : . Paper presented at EUROMAT17, Thessaloniki 17-21 September 2017,Greece (pp. 1-1).
Open this publication in new window or tab >>Hot Corrosion Behavior of HVOF CoNiCrAlY(Hf) Coating on Ni-based Superalloys
2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
Keywords
MCrAlY, Hot Corrosion, Reactive Element, Hafnium
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-143974 (URN)
Conference
EUROMAT17, Thessaloniki 17-21 September 2017,Greece
Available from: 2018-01-01 Created: 2018-01-01 Last updated: 2018-01-16Bibliographically approved
Calmunger, M., Eriksson, R., Chai, G., Johansson, S. & Moverare, J. (2017). Influence of Cyclic Oxidation in Moist Air on Surface Oxidation-Affected Zones. In: : . Paper presented at EUROMAT17, Thessaloniki 17-21 September 2017,Greece (pp. 1-1).
Open this publication in new window or tab >>Influence of Cyclic Oxidation in Moist Air on Surface Oxidation-Affected Zones
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2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-143972 (URN)
Conference
EUROMAT17, Thessaloniki 17-21 September 2017,Greece
Available from: 2018-01-01 Created: 2018-01-01 Last updated: 2018-01-16Bibliographically approved
Zhang, P., Sadeghimeresht, E., Peng, R. L., Li, X.-H., Markocsan, N., Joshi, S. & Johansson, S. (2017). Isothermal oxidation behavior of HVAF-sprayed NiCoCrAlY coatings: Effect of surface treatment. In: Proceedings of International Thermal Sprayed Conference (ITSC), May 7-9,Germany, 456-461 (2017): . Paper presented at International Thermal Spray Conference & Exposition, ITSC 2017, Düsseldorf, Germany, June 7-9, 2017 (pp. 456-461).
Open this publication in new window or tab >>Isothermal oxidation behavior of HVAF-sprayed NiCoCrAlY coatings: Effect of surface treatment
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2017 (English)In: Proceedings of International Thermal Sprayed Conference (ITSC), May 7-9,Germany, 456-461 (2017), 2017, p. 456-461Conference paper, Oral presentation only (Other academic)
Abstract [en]

NiCoCrAlY coatings are widely used as bond coats for ceramic thermal barrier coatings (TBCs) andoxidation and corrosion protective overlay coatings in industrial gas turbines. High temperature oxidation behaviour of NiCoCrAlYs has a great influence on the coating performance and lifetime of TBCs. A promising route to decrease the oxidation rate of such coatings is post-coating surface modification which can facilitate formation of a uniform alumina scale with a considerably slower growth rate compared to the as-sprayed coatings. In this work, the effect of surface treatment by means of shot peening and laser surface melting (LSM) on the oxidation resistance of high velocity air-fuel (HVAF) sprayed NiCoCrAlY coatings was studied. Isothermal oxidation was carried out at 1000⁰C for 1000h. Results showed that the rough surface of as-sprayed HVAF sprayed coatings was significantly changed after shot peening and LSM treatment, with a compact and smooth appearance. After the exposure, the oxide scales formed on surface-treated NiCoCrAlY coatings showed different morphology and growth rate compared to those formed on as-sprayed coating surface. The oxidation behaviour of surface treated HVAF-sprayed NiCoCrAlY coatings were revealed and discussed.

Keywords
Surface treatment, shot peening, Laser Surface Melting (LSM), High Velocity Air-Fuel (HVAF), NiCoCrAlY coating
National Category
Manufacturing, Surface and Joining Technology Ceramics
Identifiers
urn:nbn:se:liu:diva-145094 (URN)
Conference
International Thermal Spray Conference & Exposition, ITSC 2017, Düsseldorf, Germany, June 7-9, 2017
Available from: 2017-12-28 Created: 2018-02-09 Last updated: 2018-02-09
Calmunger, M., Eriksson, R., Chai, G., Johansson, S., Högberg, J. & Moverare, J. (2017). Local Surface Phase Stability During Cyclic Oxidation Process. Paper presented at THERMEC'16, May 30 - June 3, 2016, Graz, Austria. Materials Science Forum, 879, 855-860
Open this publication in new window or tab >>Local Surface Phase Stability During Cyclic Oxidation Process
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2017 (English)In: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, Vol. 879, p. 855-860Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Trans Tech Publications, 2017
Keywords
Austenitic stainless steels, thermal cycling, corrosion, surface phase stability
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-129244 (URN)10.4028/www.scientific.net/MSF.879.855 (DOI)
Conference
THERMEC'16, May 30 - June 3, 2016, Graz, Austria
Available from: 2016-06-14 Created: 2016-06-14 Last updated: 2017-11-28
Wärner, H., Calmunger, M., Chai, G., Johansson, S. & Moverare, J. (2017). Thermomechanical Fatigue Behavior of Aged Heat Resistant Austenitic Alloys. In: : . Paper presented at EUROMAT17, Thessaloniki 17-21 September 2017,Greece (pp. 1-1).
Open this publication in new window or tab >>Thermomechanical Fatigue Behavior of Aged Heat Resistant Austenitic Alloys
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2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-143978 (URN)
Conference
EUROMAT17, Thessaloniki 17-21 September 2017,Greece
Available from: 2018-01-01 Created: 2018-01-01 Last updated: 2018-01-16Bibliographically approved
Calmunger, M., Chai, G., Johansson, S. & Moverare, J. (2016). Creep and Fatigue Interaction Behavior in Sanicro 25 Heat Resistant Austenitic Stainless Steel. Paper presented at 7th International Conference on Creep, 19-22 January 2016, IGCAR, Kalpakkam, India. Transactions of the Indian Institute of Metals, 69(2), 337-342
Open this publication in new window or tab >>Creep and Fatigue Interaction Behavior in Sanicro 25 Heat Resistant Austenitic Stainless Steel
2016 (English)In: Transactions of the Indian Institute of Metals, ISSN 0972-2815, E-ISSN 0975-1645, Vol. 69, no 2, p. 337-342Article in journal (Refereed) Published
Abstract [en]

Sanicro 25 is a newly developed advanced high strength heat resistant austenitic stainless steel. The material shows good resistance to steam oxidation and flue gas corrosion, and has higher creep rupture strength than other austenitic stainless steels available today. It is thus an excellent candidate for superheaters and reheaters for advanced ultra-super critical power plants with efficiency higher than 50 %. This paper provides a study on the creep–fatigue interaction behavior of Sanicro 25 at 700 °C. Two strain ranges, 1 and 2 %, and two dwell times, 10 and 30 min, were used. The influences of dwell time on the cyclic deformation behavior and life has been evaluated. Due to stress relaxation the dwell time causes a larger plastic strain range compared to the tests without dwell time. The results also show that the dwell time leads to a shorter fatigue life for the lower strain range, but has no or small effect on the life for the higher strain range. Fracture investigations show that dwell times result in more intergranular cracking. With the use of the electron channeling contrast imaging technique, the influences of dwell time on the cyclic plastic deformation, precipitation behavior, recovery phenomena and local plasticity exhaustion have also been studied.

Place, publisher, year, edition, pages
Springer, 2016
Keywords
Sanicro 25, advanced ultra-super critical power plant, creep, low cycle fatigue, cyclic plastic deformation
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:liu:diva-123646 (URN)10.1007/s12666-015-0806-3 (DOI)000368032700027 ()
Conference
7th International Conference on Creep, 19-22 January 2016, IGCAR, Kalpakkam, India
Note

At the time for thesis presentation publication was in status: Manuscript

Funding agencies: AB Sandvik Materials Technology in Sweden; Swedish National Energy Administration through the Research Consortium of Materials Technology for Thermal Energy Processes [KME-701]; AFM Strategic Faculty Grant SFO-MAT-LiU at Linkoping University [2009-00971]

Available from: 2016-01-04 Created: 2016-01-04 Last updated: 2017-12-01
Chai, G., Calmunger, M., Johansson, S., Moverare, J. & Odqvist, J. (2016). Influence of Dynamic Strain Ageing and Long Term Ageing on Deformation and Fracture Behaviors of Alloy 617. In: C. Sommitsch, M. Ionescu, B. Mishra, E. Kozeschnik and T. Chandra (Ed.), THERMEC 2016: . Paper presented at THERMEC'16, Graz, Austria, May 29-June 3, 2016 (pp. 306-311). Trans Tech Publications, 879
Open this publication in new window or tab >>Influence of Dynamic Strain Ageing and Long Term Ageing on Deformation and Fracture Behaviors of Alloy 617
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2016 (English)In: THERMEC 2016 / [ed] C. Sommitsch, M. Ionescu, B. Mishra, E. Kozeschnik and T. Chandra, Trans Tech Publications, 2016, Vol. 879, p. 306-311Conference paper, Published paper (Refereed)
Abstract [en]

Influences of dynamic strain ageing and long term ageing on deformation, damage and fracture behaviors of Alloy 617 material have been studied. Dynamic strain ageing can occur in this alloy at temperature from 400 to 700°C, which leads to a strain hardening and also an increase in fracture strain due to plastic deformation caused by twinning. Long term ageing at 700°C for up to 20 000 hours can cause different precipitation such as γ ́, M6C (Mo-rich) and M23C6 (Cr-rich) carbides. These carbides are both inter-and intra-granular particles. The long term ageing reduces the fracture toughness of the material, but the alloy can still have rather high impact toughness and fracture toughness even with an ageing at 700°C for 20 000 hour. The mechanisms have been studied using electron backscatter detection and electron channeling contrast imaging. It shows that besides dislocation slip, twinning is another main deformation mechanism in these aged Alloy 617 materials. At the crack front, plenty of micro or nanotwins can be observed. The formation of these twins leads to a high ductility and toughness which is a new observation or a new concept for this type of material.

Place, publisher, year, edition, pages
Trans Tech Publications, 2016
Series
Materials Science Forum, ISSN 1662-9752 ; 879
Keywords
Nickel based superalloy, Ageing, Fracture toughness, Microstructure, Twinning
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-129243 (URN)10.4028/www.scientific.net/MSF.879.306 (DOI)
Conference
THERMEC'16, Graz, Austria, May 29-June 3, 2016
Available from: 2016-06-14 Created: 2016-06-14 Last updated: 2016-11-30Bibliographically approved
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