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Publications (10 of 28) Show all publications
Forouzan, F., Gunasekaran, S., Hedayati, A., Vuorinen, E. & Mücklich, F. (2017). Microstructure analysis and mechanical properties of Low alloy High strength Quenched and Partitioned Steel. Paper presented at 8th conference of Materials Structure & Micromechanics of Fracture (MSMF8), Brno, Czech republic, 27-29 June, 2016. Solid State Phenomena, 258, 574-578
Open this publication in new window or tab >>Microstructure analysis and mechanical properties of Low alloy High strength Quenched and Partitioned Steel
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2017 (English)In: Solid State Phenomena, ISSN 1012-0394, E-ISSN 1662-9779, Vol. 258, p. 574-578Article in journal (Refereed) Published
Abstract [en]

Gleeble study of the quenching and partitioning (Q&P) process has been performed onDomex 960 steel (Fe, 0.08 %C, 1.79 %Mn, 0.23 %Si, 0.184 %Ti, and 0.038 %Al). The effect ofdifferent Q&P conditions on microstructure and mechanical properties were investigated. The aimof the process is to produce a fine grained microstructure for better ductility and controlled amountsof different micro-constituents to increase the strength and toughness simultaneously. Threedifferent quenching temperatures, three partitioning temperatures and three partitioning times havebeen selected to process the 27 specimens by Gleeble® 1500. The specimens were characterized bymeans of OM, SEM, XRD, hardness and impact tests. It was found that, fine lath martensite withretained austenite is achievable without high amount of Si or Al in the composition although lack ofthese elements may cause the formation of carbides and decrease the available amount of carbon forpartitioning into the austenite. The hardness increases as the quenching temperature is decreased,however, at highest partitioning temperature (640◦C) the hardness increases sharply due to extensiveprecipitate formation.

Place, publisher, year, edition, pages
Trans Tech Publications Inc., 2017
Keywords
AHSS, Gleeble, Quenching and partitioning (Q&P), X-ray, mechanical properties
National Category
Other Materials Engineering
Research subject
Engineering Materials; Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-60479 (URN)10.4028/www.scientific.net/SSP.258.574 (DOI)2-s2.0-85009754153 (Scopus ID)
Conference
8th conference of Materials Structure & Micromechanics of Fracture (MSMF8), Brno, Czech republic, 27-29 June, 2016
Note

Konferensartikel i tidskrift

Available from: 2016-11-16 Created: 2016-11-16 Last updated: 2019-03-04Bibliographically approved
Hedayati, A., Asghari, S., Alinoori, A. H., Koosha, M. & Vuorinen, E. (2016). Effects of coating thickness on corrosion and contact resistance behavior of TiN coated AISI 316L as bipolar plates for PEMFC. Iranian Journal of Hydrogen & Fuel Cell, 3(2), 137-149
Open this publication in new window or tab >>Effects of coating thickness on corrosion and contact resistance behavior of TiN coated AISI 316L as bipolar plates for PEMFC
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2016 (English)In: Iranian Journal of Hydrogen & Fuel Cell, ISSN 2383-1618, Vol. 3, no 2, p. 137-149Article in journal (Refereed) Published
Abstract [en]

In the polymer electrolyte membrane fuel cells (PEMFCs), low corrosion resistance and high interfacial contact resistance (ICR) are two controversial issues in usage of AISI 316L stainless steel as a metallic bipolar plate. For solving these problems, investigation and development of different coatings and/or surface treatments are inevitable. Corrosion behavior and ICR of AISI 316L specimens coated with 1, 2, and 3 µm thick TiN were investigated. Potentiodynamic (PD), potentiostatic (PS) and electrochemical impedance spectroscopy (EIS) tests were conducted at 80 °C in pH3 H2SO4+2 ppm HF solution purged with either O2 or H2 under both simulated cathodic and anodic conditions. The PS corrosion test results revealed that the current densities of the specimens were below 1 µA cm−2. In the simulated cathodic condition, an increase of coating thickness from 1 to 3 µm led to a relatively large decrease of the current density from 0.76 to 0.43 µA cm−2. Furthermore, the ICR values of the coated specimens after the PS test were lower than that of the uncoated specimen before the PS. In general, the TiN coating decreases the ICR, and has enough corrosion resistance in simulated PEMFC conditions. However, none of the coatings achieved the DOE ICR targets.

Keywords
Proton Exchange Membrane Fuel Cells, AISI 316L Stainless Steel, Bipolar Plates, PVD Coating, Titanium Nitride (TiN) Coating
National Category
Other Materials Engineering Energy Engineering
Research subject
Engineering Materials; Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-62053 (URN)
Available from: 2017-02-16 Created: 2017-02-16 Last updated: 2019-09-11Bibliographically approved
Forouzan, F., Gunasekaran, S., Hedayati, A., Vuorinen, E. & Mücklich, F. (2016). Microstructure analysis and mechanical properties of Low alloy High strength Quenched and Partitioned Steel. In: MSMF 2016: Materials Structure & Micromechanics of Fracture. Paper presented at 8th International Conference on Materials Structure & Micromechanics of Fracture, Brno, Czech Republic, June 27–29, 2016.
Open this publication in new window or tab >>Microstructure analysis and mechanical properties of Low alloy High strength Quenched and Partitioned Steel
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2016 (English)In: MSMF 2016: Materials Structure & Micromechanics of Fracture, 2016Conference paper, Oral presentation with published abstract (Refereed)
National Category
Metallurgy and Metallic Materials Energy Engineering
Research subject
Engineering Materials; Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-62293 (URN)
Conference
8th International Conference on Materials Structure & Micromechanics of Fracture, Brno, Czech Republic, June 27–29, 2016
Available from: 2017-03-04 Created: 2017-03-04 Last updated: 2018-03-05Bibliographically approved
Schodek, D. L., Ferreira, P. & Ashby, M. F. (2016). Nanomaterials, nanotechnologies and design: an introduction for engineers and architects. Jahad Daneshgahi Isfahan, 1
Open this publication in new window or tab >>Nanomaterials, nanotechnologies and design: an introduction for engineers and architects
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2016 (Persian)Book (Other academic)
Place, publisher, year, edition, pages
Jahad Daneshgahi Isfahan, 2016
National Category
Engineering and Technology Materials Engineering Nano Technology Mechanical Engineering Other Materials Engineering Energy Engineering
Research subject
Engineering Materials; Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-62286 (URN)9786008157076 (ISBN)
Available from: 2017-03-04 Created: 2017-03-04 Last updated: 2017-11-24Bibliographically approved
Vuorinen, E., Heino, V., Ojala, N., Haiko, O. & Hedayati, A. (2016). The effects of microstructure on erosive-abrasive wear behavior of carbide free bainitic and boron steels. In: Nordic Symposium on Tribology - NORDTRIB 2016: . Paper presented at 17th Nordic Symposium on Tribology - NORDTRIB 2016, Aulanko, Hämeenlinna, Finland, 14–17 June 2016.
Open this publication in new window or tab >>The effects of microstructure on erosive-abrasive wear behavior of carbide free bainitic and boron steels
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2016 (English)In: Nordic Symposium on Tribology - NORDTRIB 2016, 2016Conference paper, Published paper (Refereed)
National Category
Other Materials Engineering Energy Engineering
Research subject
Engineering Materials; Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-62050 (URN)
Conference
17th Nordic Symposium on Tribology - NORDTRIB 2016, Aulanko, Hämeenlinna, Finland, 14–17 June 2016
Available from: 2017-02-16 Created: 2017-02-16 Last updated: 2018-03-05Bibliographically approved
Hedayati, A., Asghari, S., Faghilhimmani, B. & Koosha, M. (2013). A coating with highcorrosion resistance and low interfacial contact resistance for metallic bipolar plates of PEMfuel cells. ir 83780.
Open this publication in new window or tab >>A coating with highcorrosion resistance and low interfacial contact resistance for metallic bipolar plates of PEMfuel cells
2013 (Persian)Patent (Other (popular science, discussion, etc.))
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-61700 (URN)
Patent
IR 83780
Available from: 2017-01-30 Created: 2017-01-30 Last updated: 2017-11-24Bibliographically approved
Hedayati, A., Asghari, S. & Alinouri, A. (2013). Corrosion behavior and interfacial contact resistance of TiN coated type 316L stainless steel as bipolar plate for proton exchange membrane fuel cell. In: : . Paper presented at 6th Iranian fuel cell Seminar, Shahid Rajaee Teacher Training University, Tehran, Iran.
Open this publication in new window or tab >>Corrosion behavior and interfacial contact resistance of TiN coated type 316L stainless steel as bipolar plate for proton exchange membrane fuel cell
2013 (English)Conference paper, Published paper (Refereed)
National Category
Materials Engineering Metallurgy and Metallic Materials Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-62291 (URN)
Conference
6th Iranian fuel cell Seminar, Shahid Rajaee Teacher Training University, Tehran, Iran
Available from: 2017-03-04 Created: 2017-03-04 Last updated: 2017-11-24Bibliographically approved
Surkialiabad, R., Hedayati, A. & Alam, A. S. (2013). Monitoring of Martensitic Transformation in Cold-Rolled 304L Austenitic Stainless Steel by Eddy Current Method (ed.). e-Jounral of Nondestructive Testing, 1(10)
Open this publication in new window or tab >>Monitoring of Martensitic Transformation in Cold-Rolled 304L Austenitic Stainless Steel by Eddy Current Method
2013 (English)In: e-Jounral of Nondestructive Testing, ISSN 1435-4934, Vol. 1, no 10Article in journal (Refereed) Published
Abstract [en]

With measuring the volume fraction of martensite, the destruction of the samples would be considered. In this work a 304L AISI austenitic stainless steel was rolled from 10 to 80 % reduction then the formation of martensite phase was monitored by X-ray diffraction, image analysis of optical, SEM microscopy and eddy current investigation. Also eddy current was carried out in the wide range of frequencies from 50 to 10000 Hz to figure out the effect of it on structural changes then the outputs were calibrated by XRD. By comparing the data of these methods relationship between them was found to be a function of exponential regression. In spite, some researchers have previouslyreported a linear relationship.

National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-3071 (URN)0d68ef29-b293-4248-992b-4c264a78311f (Local ID)0d68ef29-b293-4248-992b-4c264a78311f (Archive number)0d68ef29-b293-4248-992b-4c264a78311f (OAI)
Note

Upprättat; 2013; 20160620 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Surkialiabad, R. & Hedayati, A. (2013). Similar tendency to strain-induced martensite transformation in different austenitic stainless steels (ed.). Materials Performance and Characterization, 2(1), 206-213
Open this publication in new window or tab >>Similar tendency to strain-induced martensite transformation in different austenitic stainless steels
2013 (English)In: Materials Performance and Characterization, E-ISSN 2165-3992, Vol. 2, no 1, p. 206-213Article in journal (Refereed) Published
Abstract [en]

The formation of strain-induced martensite in metastable austenitic stainless steels depends on many parameters; the most well known and highly investigated of these is temperature. In this work, we suggest a new relationship between Md30/50, deformation temperature (DT), and martensite content based on data gathered from other studies and our experimental findings. For this purpose we rolled an AISI 304L stainless steel in different strains at 25°C, 0°C, and - 15°C; then we characterized the steel via x-ray diffraction and Ferritescope studies to identify different phases and calculate their contents. According to the results, the relationship is as follows: If the delta value (DT - Md30/50) is the same for different austenitic stainless steels, they will form equal amounts of martensite under similar strain conditions. Moreover, both the delta value and the true strain have a strong effect on the formation of martensite.

National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-3536 (URN)10.1520/MPC20120044 (DOI)15d991fb-5c62-4f61-b143-c946953fb5e9 (Local ID)15d991fb-5c62-4f61-b143-c946953fb5e9 (Archive number)15d991fb-5c62-4f61-b143-c946953fb5e9 (OAI)
Note

Upprättat; 2013; 20160620 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Hedayati, A., Asghari, S. & Alinouri, A. (2012). An Investigation on contact resistance and corrosion properties of AISI 316L stainless steel as bipolar plate in proton exchange membrane fuel cell. In: : . Paper presented at 2nd Conference on Hydrogen and Fuel Cell, K. N. Toosi University of Technology, Tehran, Iran.
Open this publication in new window or tab >>An Investigation on contact resistance and corrosion properties of AISI 316L stainless steel as bipolar plate in proton exchange membrane fuel cell
2012 (Persian)Conference paper, Published paper (Refereed)
National Category
Materials Engineering Metallurgy and Metallic Materials Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-62288 (URN)
Conference
2nd Conference on Hydrogen and Fuel Cell, K. N. Toosi University of Technology, Tehran, Iran
Available from: 2017-03-04 Created: 2017-03-04 Last updated: 2017-11-24Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-9088-2286

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