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Vuorinen, Esa, associate professorORCID iD iconorcid.org/0000-0002-9100-7982
Publications (10 of 50) Show all publications
Pineda Huitron, R. M., Lopez, P. E. R., Vuorinen, E., Jentner, R. & Kärkkäinen, M. E. (2020). Converging criteria to characterize crack susceptibility in a micro-alloyed steel during continuous casting. Materials Science & Engineering: A, 772, Article ID 138691.
Open this publication in new window or tab >>Converging criteria to characterize crack susceptibility in a micro-alloyed steel during continuous casting
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2020 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 772, article id 138691Article in journal (Refereed) Published
Abstract [en]

The ductility drop and decrease in strength that lead to crack formation during continuous casting of steel is typically investigated by means of the hot ductility test. In this study, hot ductility tests are performed by using a thermo-mechanical Gleeble system to simulate the deformation of steels at high temperatures and low deformation rates similar to those during continuous casting. Thus, temperature was varied between 600 and 1000°C while strain rates covered a range from 0.001 to 0.1s−1. Tests are carried out to identify the temperature range at which the steel is susceptible to crack formation as well as the effect of strain rate. Characterization of fractured surfaces and phase transformation after thermo-mechanical tests are conducted in the SEM and Optical Microscope. The combination of these techniques makes possible to formulate cracking mechanisms during hot processing which show critical strain for failure at temperatures between 700 and 900°C based on the convergence of three different criteria: I) Reduction of area, II) True fracture strength-ductility and III) True total energy. This approach provides a better understanding of crack formation in steels at the high temperatures experienced during continuous casting. This information is key to productivity losses and avoid defect formation in the final cast products.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Crack susceptibility, Total energy, Reduction of area, Flow-response curves, Continuous casting
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-76945 (URN)10.1016/j.msea.2019.138691 (DOI)000509621500110 ()2-s2.0-85075854699 (Scopus ID)
Note

Validerad;2020;Nivå 2;2020-01-29 (johcin)

Available from: 2019-11-28 Created: 2019-11-28 Last updated: 2020-03-06Bibliographically approved
Moghaddam, P. V., Hardell, J., Vuorinen, E., Caballero, F. G., Sourmail, T. & Prakash, B. (2020). Corrigendum to: The role of retained austenite in dry rolling/sliding wear of nanostructured carbide-free bainitic steels, Wear 428–429 (2019) 193 - 204. Wear, 446-447, Article ID 203072.
Open this publication in new window or tab >>Corrigendum to: The role of retained austenite in dry rolling/sliding wear of nanostructured carbide-free bainitic steels, Wear 428–429 (2019) 193 - 204
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2020 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 446-447, article id 203072Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Elsevier, 2020
National Category
Other Materials Engineering Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements; Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-77919 (URN)10.1016/j.wear.2019.203072 (DOI)000513004300001 ()2-s2.0-85075451518 (Scopus ID)
Note

Godkänd;2020;Nivå 0;2020-03-02 (alebob)

Available from: 2020-03-02 Created: 2020-03-02 Last updated: 2020-03-02Bibliographically approved
Moghaddam, P. V., Hardell, J., Vuorinen, E. & Prakash, B. (2020). Effect of retained austenite on adhesion-dominated wear of nanostructured carbide-free bainitic steel. Tribology International, Article ID 106348.
Open this publication in new window or tab >>Effect of retained austenite on adhesion-dominated wear of nanostructured carbide-free bainitic steel
2020 (English)In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, article id 106348Article in journal (Refereed) In press
Abstract [en]

Sliding wear performance of carbide-free bainitic steel is significantly affected by microstructure. This investigation is an attempt to find a correlation between microstructure and wear resistance of carbide-free bainitic steel and compare the results with that of a conventional tempered martensitic microstructure. Under predominantly adhesive wear conditions, carbide-free bainitic microstructure with the highest amount of retained austenite offers the best wear resistance. This is mainly attributed to the more pronounced work hardening and TRIP-effect of carbide-free bainitic microstructure austempered at higher temperature. Therefore, higher initial bulk hardness is not the only indicator of wear resistance. Moreover, when both oxidation and adhesion are active, a microstructure with an optimum content of retained austenite and bainitic ferrite shows the highest wear resistance.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
bainite, Carbide-free, Retained austenite, Wear
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-78379 (URN)10.1016/j.triboint.2020.106348 (DOI)
Available from: 2020-04-07 Created: 2020-04-07 Last updated: 2020-04-07
Vuorinen, E., Hosseini, N., Hedayati, A., Kornacker, E., Fernandez, M. T., Sanz, J., . . . Cañibano, E. (2020). Mechanical and microstructural evaluation of high performance steel (S700MC) for road restraint systems. Engineering Failure Analysis, 108, Article ID 104251.
Open this publication in new window or tab >>Mechanical and microstructural evaluation of high performance steel (S700MC) for road restraint systems
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2020 (English)In: Engineering Failure Analysis, ISSN 1350-6307, E-ISSN 1873-1961, Vol. 108, article id 104251Article in journal (Refereed) Published
Abstract [en]

The suitability of using high performance steel (S700MC) for road restraint systems (RRS) under very high containment level was evaluated in this study. To investigate the influence of the crash on the mechanical behaviour of the steel, different test pieces were tested by tensile and hardness testing, and examined by scanning electron microscopy (SEM). The tensile test results of S700MC showed a noticeable increase in yield strength at 0.2% elongation (Rp0.2) from 744 to 935 MPa, and ultimate tensile strength (UTS) from 810 to 1017 MPa, before and after crash tests (BC and AC, respectively). S700MC showed ~9% lower elongation at fracture value in comparison with S275JR and S355JR steels. Besides, fracture toughness, was significantly higher for S700MC (133 and 148 MJ/m3 for BC and AC, respectively) compared to conventional mild steels (108–118 MJ/m3). Microstructural observations of head-part of all S700MC samples revealed equi-axed grains. The fracture surface of tensile tested samples before crash, showed elongated grains accompanied by pore formation. Among after crash samples, one test piece showed intergranular cracks while no intergranular cracks were observed for the other crashed pieces which resulted in the lower Rp0.2 (813 MPa) and UTS strength (847 MPa) and fracture toughness (125 MJ/m3). The results showed that although RRS manufactured with S700MC undergoes severe mechanical deformation, the risk of brittle fracture is very low and this is beneficial from industrial as well as social point of view.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Failure analysis, Fracture toughness, Hydrogen-assisted cracking, Mechanical testing, Microstructures
National Category
Metallurgy and Metallic Materials Energy Engineering Other Materials Engineering
Research subject
Energy Engineering; Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-76929 (URN)10.1016/j.engfailanal.2019.104251 (DOI)000505213100037 ()2-s2.0-85075357040 (Scopus ID)
Note

Validerad;2020;Nivå 2;2020-01-27 (johcin)

Available from: 2019-11-28 Created: 2019-11-28 Last updated: 2020-01-27Bibliographically approved
Caballero, F. G., Pujante, J., Sourmail, T., Rementeria, R., De-Castro, D., Dierickx, P., . . . Vuorinen, E. (2019). Advanced Heat Treatments and Complex Ferritic Structures for Bearing Steels. Metals, 9(11), Article ID 1137.
Open this publication in new window or tab >>Advanced Heat Treatments and Complex Ferritic Structures for Bearing Steels
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2019 (English)In: Metals, E-ISSN 2075-4701, Vol. 9, no 11, article id 1137Article in journal (Refereed) Published
Abstract [en]

Nanostructured bainitic steels exhibit an optimum strength/toughness combination as a consequence of their extremely fine structure. They have also demonstrated potential for wear-resistance applications. The aim of this work was to develop bearing steels by the multi-scale control of complex ferritic structures, designed using atomic transformation theory and processed by novel heat treatments. Based on the results, the new ball bearings outperformed conventional grades, approaching more expensive material options. 

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
steel, bainite, ultra-high strength, wear resistance, ball bearings
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-76774 (URN)10.3390/met9111137 (DOI)000504411600005 ()2-s2.0-85074235869 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-11-20 (johcin)

Available from: 2019-11-20 Created: 2019-11-20 Last updated: 2020-03-03Bibliographically approved
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
Makarova, I., Dobryden, I., Kharitonov, D., Kasach, A., Ryl, J., Repo, E. & Vuorinen, E. (2019). Nickel-nanodiamond coatings electrodeposited from tartrate electrolyte at ambient temperature. Surface & Coatings Technology, 380, Article ID 125063.
Open this publication in new window or tab >>Nickel-nanodiamond coatings electrodeposited from tartrate electrolyte at ambient temperature
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2019 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 380, article id 125063Article in journal (Refereed) Published
Abstract [en]

In this study, nanocrystalline Ni and Ni-diamond coatings were obtained by electrodeposition from tartrate electrolyte at ambient temperature aiming at improving corrosion and wear properties of the material. The created surfaces were investigated with regard to microhardness, adhesion, wear- and corrosion-resistance. The various methods such as atomic force microscopy, scanning electron microscopy, electrochemical impedance spectroscopy and linear polarization technique were applied to study the coating surface properties. The introduction of nanodiamond particles into the coating led to a rougher surface structure and a bigger grain size in comparison to bare nickel coating. Our study shows that the addition of 5·10−2 (g dm−3) of nanodiamonds to the plating bath is enough to obtain composite coatings with a clear increase in microhardness and wear resistance. The slightly improved corrosion resistance of the coating, decrease in corrosion current density from 0.41 to 0.14 μA cm−2 in neutral chloride-containing medium, and nobler values of the corrosion potential were also observed.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Electrolytic co-deposition, Ni-nanodiamond composite coating, Kinetics, Morphology, Corrosion, Wear
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-76494 (URN)10.1016/j.surfcoat.2019.125063 (DOI)000502882700015 ()2-s2.0-85073515452 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-10-24 (johcin)

Available from: 2019-10-24 Created: 2019-10-24 Last updated: 2020-02-25Bibliographically approved
Forouzan, F., Borasi, L., Vuorinen, E. & Mücklich, F. (2019). Optimization of Quenching Temperature to Minimize the Micro Segregation Induced Banding Phenomena in Quenching and Partitioning (Q&P) Steels. Steel Research International, 90(1), Article ID 1800281.
Open this publication in new window or tab >>Optimization of Quenching Temperature to Minimize the Micro Segregation Induced Banding Phenomena in Quenching and Partitioning (Q&P) Steels
2019 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 90, no 1, article id 1800281Article in journal (Refereed) Published
Abstract [en]

Mn, Cr, and Si are favorable elements for designing the quenching and partitioning (Q&P) steels while the microsegregation of them is a common phenomenon in the steels. This segregation makes the bands of enriched and depleted Mn–Cr regions, which affects the Ms temperature of the bands and consequently influence the volume fraction of initial martensite, retained austenite, and secondary fresh martensite in different bands. This issue leads to non-homogeneity in the microstructure and mechanical properties. In this study, the optimization method to minimize the inhomogeneity by selection of the quenching temperature is demonstrated.

Place, publisher, year, edition, pages
John Wiley & Sons, 2019
Keywords
banding, hardness, microsegregation, microstructure, quenching and partitioning (Q&P)
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-71024 (URN)10.1002/srin.201800281 (DOI)000454790200006 ()2-s2.0-85053542723 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-01-25 (johcin) 

Available from: 2018-09-28 Created: 2018-09-28 Last updated: 2019-03-04Bibliographically approved
Forouzan, F., Borasi, L., Vuorinen, E. & Mücklich, F. (2019). Process Control Maps to Design an Ultra-High Strength-Ductile Steel. Materials Science and Technology, 35(10), 1173-1184
Open this publication in new window or tab >>Process Control Maps to Design an Ultra-High Strength-Ductile Steel
2019 (English)In: Materials Science and Technology, ISSN 0267-0836, E-ISSN 1743-2847, Vol. 35, no 10, p. 1173-1184Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Taylor & Francis, 2019
Keywords
ultrahigh strength, high carbon low alloy steel, Q&P, ductility, map
National Category
Metallurgy and Metallic Materials Other Materials Engineering
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-73102 (URN)10.1080/02670836.2019.1615752 (DOI)000469142200001 ()2-s2.0-85066881284 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-06-19 (johcin)

Available from: 2019-03-04 Created: 2019-03-04 Last updated: 2019-06-19Bibliographically approved
Moghaddam, P. V., Hardell, J., Vuorinen, E. & Prakash, B. (2019). The role of retained austenite in dry rolling/sliding wear of nanostructured carbide-free bainitic steels. Wear, 428-429, 193-204
Open this publication in new window or tab >>The role of retained austenite in dry rolling/sliding wear of nanostructured carbide-free bainitic steels
2019 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 428-429, p. 193-204Article in journal (Refereed) Published
Abstract [en]

The dry rolling/sliding wear of nanostructured bainite has been investigated and compared with that of a conventional quenched and tempered bearing steel. In order to elucidate the role of retained austenite on the wear performance, high silicon hypereutectoid bearing steel with an identical alloy composition was heat treated to obtain different microstructures with similar hardness and different amounts of retained austenite. The results indicate that the nanostructured bainite can meet the minimum hardness requirements for bearing applications. Moreover, the nanostructured bainite outperformed the tempered martensitic steel in terms of wear resistance. The work hardening capacity and thus wear resistance increases due to the transformation of retained austenite into martensite. The results of XRD analyses show that the higher stability of retained austenite and strength of bainitic ferrite leads to better wear performance. It is demonstrated that the stability of retained austenite outweigh the influence of retained austenite content on wear resistance. Adhesion and oxidation were identified as the main wear mechanisms. In addition to microstructure, surface oxidation also plays a prominent role in determining the wear resistance. 

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Bearings, Carbide-free bainite, Nanostructured materials, Retained austenite, Rolling-sliding, TRIP effect
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-73366 (URN)10.1016/j.wear.2019.03.012 (DOI)000471596300019 ()2-s2.0-85063237323 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-04-01 (svasva)

Available from: 2019-04-01 Created: 2019-04-01 Last updated: 2019-07-10Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-9100-7982

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