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Publications (10 of 39) Show all publications
Malmström, M., Jansson, J., Lindell, D., Brask, J. & Hutchinson, B. (2019). Comparative study of structures in annealed 304 stainless steel using laser-ultrasonics (LUS) in combination with EBSD and XRD. In: : . Paper presented at 4th International Workshop on Laser-Ultrasound for Metals, 25th to 26th September 2019, Linz, Austria.
Open this publication in new window or tab >>Comparative study of structures in annealed 304 stainless steel using laser-ultrasonics (LUS) in combination with EBSD and XRD
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2019 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

The material investigated was 304 (18/8) stainless steel that had been rolled with 70% at 700°C reduction to a final thickness of 2.9 mm. This warm rolling was chosen to avoid complications due to the formation of deformation martensite at room temperature. A 2.9x30x170 mm strip of the steel was then annealed in a controlled temperature gradient ranging from room temperature up to 1100°C so that all possible microstructural stages were represented, comprising recovery, recrystallisation and grain growth as well as their related texture changes. All measurements were made after cooling the specimen down to room temperature.Grain sizes were measured by LUS using the b-parameter analysis of attenuation data. In addition, the newly developed method for scanning the generating laser was applied to show the influence of texture on the anisotropy of wave velocities. Thus, both grain size and texture were continuously monitored along the length of the gradient annealed specimen.X-ray diffraction (XRD) was applied at various positions such that recovery and recrystallisation could be quantified using peak breadth measurements. In addition, microstructures and textures were determined using electron back-scattering diffraction (EBSD) at several locations corresponding to different annealing temperatures.All the observations were congruent in defining the location where primary recrystallisation had taken place over a relatively short distance on the specimen. The XRD line breadths dropped sharply and then remained constant after higher temperatures. However, the LUS grain sizes which also showed a sharp decrease then increased continuously as grain growth progressed, in good agreement with the EBSD observations. The anisotropic wave velocity results confirmed a significant change in the texture corresponding to recrystallisation despite the fact that EBSD showed that there was, in fact, only a modest weakening. A sensitive parameter defining recrystallisation was found to be the Poisson’s ratio which fell sharply and then increased very gradually up to the highest temperatures. This is interpreted as being due to the textural change during recrystallisation, followed by some sharpening of the annealing texture during subsequent grain growth.

Keywords
Laser Ultrasonics
National Category
Natural Sciences
Identifiers
urn:nbn:se:kth:diva-260963 (URN)
Conference
4th International Workshop on Laser-Ultrasound for Metals, 25th to 26th September 2019, Linz, Austria
Funder
Vinnova, 2018-03916EU, European Research Council, RFCS
Note

QC 20191007

Available from: 2019-10-01 Created: 2019-10-01 Last updated: 2019-10-09Bibliographically approved
Hutchinson, B., Malmström, M., Lönnqvist, J., Bate, P., Ehteshami, H. & Korzhavyi, P. A. (2018). Elasticity and wave velocity in fcc iron (austenite) at elevated temperatures – Experimental verification of ab-initio calculations. Ultrasonics, 87, 44-47
Open this publication in new window or tab >>Elasticity and wave velocity in fcc iron (austenite) at elevated temperatures – Experimental verification of ab-initio calculations
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2018 (English)In: Ultrasonics, ISSN 0041-624X, E-ISSN 1874-9968, Vol. 87, p. 44-47Article in journal (Refereed) Published
Abstract [en]

High temperature crystal elasticity constants for face centred cubic austenite are important for interpreting the ultrasonic properties of iron and steels but cannot be determined by normal single crystal methods. Values of these constants have recently been calculated using an ab-initio approach and the present work was carried out to test their applicability using laser-ultrasonic measurements. Steel samples having a known texture were examined at temperatures between 800 °C and 1100 °C to measure the velocity of longitudinal P-waves which were found to be in good agreement with modelled values.

Place, publisher, year, edition, pages
Elsevier, 2018
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-224796 (URN)10.1016/j.ultras.2018.02.009 (DOI)000428615300006 ()2-s2.0-85041837399 (Scopus ID)
Note

QC 20180326

Available from: 2018-03-26 Created: 2018-03-26 Last updated: 2018-04-19Bibliographically approved
F.D, V. D., P.J.J, K., H, Y., M.P, A., P, M., T, K., . . . P, L. (2018). Product Uniformity Control - A Research Collaboration of European Steel Industries to Non-Destructive Evaluation of Microstructure and Mechanical Properties. In: Volume 43: Electromagnetic Non-Destructive Evaluation (XXI): (pp. 120-129). IOS Press
Open this publication in new window or tab >>Product Uniformity Control - A Research Collaboration of European Steel Industries to Non-Destructive Evaluation of Microstructure and Mechanical Properties
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2018 (English)In: Volume 43: Electromagnetic Non-Destructive Evaluation (XXI), IOS Press, 2018, p. 120-129Chapter in book (Refereed)
Abstract [en]

In steel manufacturing, the conventional method to determine the mechanical properties and microstructure is by offline, destructive (lab-)characterisation of sample material that is typically taken from the head or the tail of the coil. Since coils can be up to 7 km long, the samples are not always representative for the main coil body. Also, the time delay (typically a few days) between the actual production and the availability of the characterisation results implies that these results cannot be exploited for real-time adaptation of the process settings.

Place, publisher, year, edition, pages
IOS Press, 2018
Series
Studies in Applied Electromagnetics and Mechanics, ISSN 1383-7281
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-243288 (URN)10.3233/978-1-61499-836-5-120 (DOI)2-s2.0-85050540071 (Scopus ID)
Funder
EU, European Research Council, RFSR-CT-2013-00031
Note

QC 20190226

Available from: 2019-02-04 Created: 2019-02-04 Last updated: 2019-02-26Bibliographically approved
Berg, F. v., Kok, P. J., Yang, H., Aarnts, M., Meilland, P., Kebe, T., . . . Lombard, P. (2018). Results of the European collaborative project “Product Uniformity Control“ to improve the inline sensing of mechanical properties and microstructure of automotive steels. In: : . Paper presented at 12th European Conference on Non-Destructive Testing (12th ECNDT).
Open this publication in new window or tab >>Results of the European collaborative project “Product Uniformity Control“ to improve the inline sensing of mechanical properties and microstructure of automotive steels
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2018 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-228308 (URN)
Conference
12th European Conference on Non-Destructive Testing (12th ECNDT)
Funder
EU, European Research Council, RFSR-CT-2013-00031
Note

QC 20190227

Available from: 2019-02-04 Created: 2019-02-04 Last updated: 2019-02-27Bibliographically approved
Wirdelius, H., Malmström, M., Duijster, A., Volker, A., Krix, D., Stolzenberg, M., . . . Kok, P. J. (2018). Validation of models for Laser Ultrasonic spectra as a function of the grain size in steel. In: : . Paper presented at 12th European Conference on Non-Destructive Testing (12th ECNDT).
Open this publication in new window or tab >>Validation of models for Laser Ultrasonic spectra as a function of the grain size in steel
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2018 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

To reduce costs of production and increase economic sustainability it is necessary to introduce quality assessment in an early stage in the manufacturing process. In an ongoing European project (Product Uniformity Control – PUC), the intention is to use ultrasonic information to assess microstructure parameters that are related to macroscale qualities such as mechanical properties. Laser induced ultrasonic technique (LUS) requires no media and can generate and detect ultrasonic information at some distance from the component. This technique is therefore addressed within this project as a solution to measure ultrasonic properties in an industrial environment.

Mathematical modelling of the ultrasonic wave propagation problem has been used in order to get a deeper understanding of the physics and to identify ultrasonic properties that can be used as an indirect measurement of grain size. The use of both analytical and numerical models enabled extensive parametric studies together with investigation of ultrasonic interactions with well-defined individual microstructures.

The LUS technique has previously been applied to e.g. monitor grain growth during thermomechanical processing of metals. These applications identified and used a correlation with the frequency content of the attenuation. This have been investigated as a possible indirect measurement of grain size, also in this project. The models have been used to verify the correlations and to evaluate different procedures that could be applied as an industrial solution. The suggested procedure is based on deconvolving two successive echoes and has been experimentally validated by two different LUS systems. The reference samples used in the validation were produced by changing the annealing temperature and time to obtain a variation in grain sizes. These grain sizes were then identified by EBSD and the samples were examined in terms of grain size influence on spectral attenuation.

National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-228306 (URN)
Conference
12th European Conference on Non-Destructive Testing (12th ECNDT)
Funder
EU, European Research Council, RFSR-CT-2013-00031
Note

QC 20190213

Available from: 2019-02-04 Created: 2019-02-04 Last updated: 2019-02-13Bibliographically approved
Malmström, M., Åslund, M., Lindh-Ulmgren, E., Hutchinson, B., Martin, D. & Pyykkönen, J. (2017). Recent experience of LUS in hot deformation of steels using Gleeble and rolling experiments. In: : . Paper presented at 3rd. International Workshop on Laser-Ultrasound for Metals. Stockholm
Open this publication in new window or tab >>Recent experience of LUS in hot deformation of steels using Gleeble and rolling experiments
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2017 (English)Conference paper, Oral presentation only (Other academic)
Place, publisher, year, edition, pages
Stockholm: , 2017
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-224797 (URN)
Conference
3rd. International Workshop on Laser-Ultrasound for Metals
Note

QC 20180326

Available from: 2018-03-26 Created: 2018-03-26 Last updated: 2018-03-26Bibliographically approved
Mauritzson, L., Hutchinson, B., Bate, P., Lundin, P., Malmström, M. & Lindh-Ulmgren, E. (2017). Texture studies using laser ultrasonics (LUS) in metal processing. In: : . Paper presented at IN-LINE MEASUREMENT AND CONTROL FOR METALS PROCESSING 2017. warwick
Open this publication in new window or tab >>Texture studies using laser ultrasonics (LUS) in metal processing
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2017 (English)Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

The results and modelling analyses presented here showsthat laser-ultrasonics (LUS) provide a viable method for obtaining texture informationin metal sheets. LUSwhich can be carried out at elevated temperatures, and are suitablefor measurementsin connection withhot processing of steels and other metals. Two approaches are presented to modelling the propagation of elastic waves, ray tracing and finite difference modelling. These give consistent results but the latter provides a more complete prediction of the ultrasonic spectrum that can be quantitatively related to measured signals through a cross-correlation procedure.There is good reason to believe thatthis method enable in-line process controloftextures.

Place, publisher, year, edition, pages
warwick: , 2017
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-224798 (URN)
Conference
IN-LINE MEASUREMENT AND CONTROL FOR METALS PROCESSING 2017
Note

QC 20180412

Available from: 2018-03-26 Created: 2018-03-26 Last updated: 2018-04-12Bibliographically approved
Malmström, M., Tarasenko, O., Margulis, W. & Laurell, F. (2016). All-Fiber Nanosecond Gating for Time-Resolved Spectral Analysis. IEEE Photonics Technology Letters, 28(8), 829-832
Open this publication in new window or tab >>All-Fiber Nanosecond Gating for Time-Resolved Spectral Analysis
2016 (English)In: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 28, no 8, p. 829-832Article in journal (Refereed) Published
Abstract [en]

We demonstrate the addition of time gating to a standard optical spectrum analyzer (OSA) operating in the spectral region similar to 1.06 mu m. This is accomplished by opening for 7 ns the optical input to the OSA with an electrically driven poled fiber in a Sagnac loop. The sequential interrogation with nanosecond resolution of the reflection from three fiber Bragg gratings along a piece of fiber allows distinguishing the spectral peaks created with a minimum separation of 85 cm. The passive extinction ratio of this device is >40 dB and returns to >40 dB from >23 dB on a 35-ns time scale directly after time gating.

Keywords
Electrooptic modulation, spectral analysis, optical fiber devices
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-185339 (URN)10.1109/LPT.2015.2513739 (DOI)000372637700002 ()2-s2.0-84963593144 (Scopus ID)
Funder
Swedish Research CouncilKnut and Alice Wallenberg FoundationEU, FP7, Seventh Framework Programme, FP7-288786Carl Tryggers foundation
Note

QC 20160421

Available from: 2016-04-21 Created: 2016-04-18 Last updated: 2017-11-30Bibliographically approved
Malmstrom, M., Karlsson, M., Forsberg, P., Cai, Y., Nikolajeff, F. & Laurell, F. (2016). Waveguides in polycrystalline diamond for mid-IR sensing. Optical Materials Express, 6(4), 1286-1295
Open this publication in new window or tab >>Waveguides in polycrystalline diamond for mid-IR sensing
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2016 (English)In: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 6, no 4, p. 1286-1295Article in journal (Refereed) Published
Abstract [en]

8 mm long channel waveguides were manufactured in polycrystalline diamond with inductively coupled plasma etching and characterized in terms of mode-profile and propagation loss in the 1.5 - 3.4 mu m spectral region. As proof of principle, the waveguides were evaluated in an evanescent field sensing setup targeting the CH absorption peak of isopropanol at similar to 3.4 mu m, showing good agreement with numerical finite element simulations. (C) 2016 Optical Society of America

National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-185990 (URN)10.1364/OME.6.001286 (DOI)000373599200035 ()
Note

QC 20160510

Available from: 2016-05-10 Created: 2016-04-29 Last updated: 2017-11-30Bibliographically approved
Yu, Z., Malmström, M., Tarasenko, O., Margulis, W. & Laurell, F. (2015). A tunable all-fiber laser based on a stress-optic phase modulator and a chirped fiber Bragg grating. In: Workshop on Specialty Optical Fibers and their Applications, WSOF 2015: . Paper presented at Workshop on Specialty Optical Fibers and their Applications, WSOF 2015, 4 November 2015 through 6 November 2015.
Open this publication in new window or tab >>A tunable all-fiber laser based on a stress-optic phase modulator and a chirped fiber Bragg grating
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2015 (English)In: Workshop on Specialty Optical Fibers and their Applications, WSOF 2015, 2015Conference paper, Published paper (Refereed)
Abstract [en]

A tunable single-wavelength Erbium-doped all-fiber laser was experimentally demonstrated. The tuning is obtained with a stress-optic phase modulator based on a twin-hole fiber and a chirped fiber Bragg grating in a medium birefringence fiber. © OSA 2015.

Keywords
Bragg gratings, Fiber Bragg gratings, Fiber lasers, Optical fibers, Phase modulation, All-fiber lasers, Birefringence fibers, Chirped fiber Bragg grating, Erbium doped, Hole fibers, Phase modulator, Single wavelength, Tunable all-fiber lasers, Fibers
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-196155 (URN)2-s2.0-84982843754 (Scopus ID)9781943580057 (ISBN)
Conference
Workshop on Specialty Optical Fibers and their Applications, WSOF 2015, 4 November 2015 through 6 November 2015
Note

Correspondence Address: Yu, Z.; Department of Applied Physics, Royal Institute of Technology (KTH), Roslagstullsbacken 21, Sweden; email: zy@laserphysics.kth.se. QC 20161116

Available from: 2016-11-16 Created: 2016-11-14 Last updated: 2016-11-16Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-3933-4406

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