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Z phase strengthened steels for ultra-supercritical power plants

Objective

The aim is to develop a heat resistant steel with a 100 000 hour creep strength of 100 MPa at 650°C. This allows increasing the thermal efficiency of fossil power plants to over 50%, which is 30% higher than the present standard in most existing power plants. The CO2 emissions are reduced accordingly. The consortium combines the expertise of a steelmaker, two utility companies, an engineering consultant company from Ukraine and eight research organizations and universities from EU and Eastern Partnership countries.
The idea is to exploit the Z phase as a thermodynamically stable strengthening agent in martensitic creep resistant steels. Previously the Z phase has been considered as detrimental, since the coarse Z-phase particles that develop during long time service in high-chromium steels hardly contribute to the strength while growing at the expense of the fine, strengthening nitride particles. However, high chromium contents around 12% are needed, since the current 9% chromium steels do not provide sufficient oxidation resistance at 650°C. Hence the challenge is to control the precipitation of the Z phase in 12% Cr steels such that fine Z particles are formed, which are stable for long times. An important aspect is that the beneficial microstructure should be established also by the post-weld heat treatment.
To achieve the goal, test melts containing different alloying elements are prepared and subjected to different heat treatments. Welding consumables and processes are also tested. Since a purely empirical alloy development is time consuming and costly, the process is supported by microstructural investigations on an atomic scale. Similarly, multiscale modelling methods are developed and applied to Z-phase strengthened steels. Modelling not only enhances the fundamental understanding of the strengthening and degradation mechanisms, but also provides design tools and lifetime estimation methods for the safe and reliable operation of future power plants.

Field of science

  • /natural sciences/chemical sciences/inorganic chemistry/inorganic compounds
  • /natural sciences/chemical sciences/electrochemistry/electrolysis
  • /natural sciences/physical sciences/theoretical physics/particles

Call for proposal

FP7-NMP-2012-SMALL-6
See other projects for this call

Funding Scheme

CP-SICA - Collaborative project for specific cooperation actions dedicated to international cooperation partner countries (SICA)

Coordinator

FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Address
Hansastrasse 27C
80686 Munchen
Germany
Activity type
Research Organisations
EU contribution
€ 721 365,01
Administrative Contact
Michael Prestele (Mr.)

Participants (10)

SAARSCHMIEDE GMBH FREIFORMSCHMIEDE*
Germany
EU contribution
€ 220 020
Address
Bismarckstrasse 57-59
66333 Volklingen
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
Administrative Contact
Bernhard Donth (Dr.)
ENGINEERING ACADEMY OF ARMENIA NGO
Armenia
EU contribution
€ 53 955
Address
Teryan St 105 Building 17 Floor 2
0009 Yerevan
Activity type
Research Organisations
Administrative Contact
Razmik Barseghyan (Prof.)
RWE POWER AKTIENGESELLSCHAFT
Germany
EU contribution
€ 89 434,99
Address
Rwe Platz 2
45141 Essen
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
Administrative Contact
Reinhold Elsen (Dr.)
DANMARKS TEKNISKE UNIVERSITET
Denmark
EU contribution
€ 274 200
Address
Anker Engelundsvej 1 Bygning 101 A
2800 Kgs Lyngby
Activity type
Higher or Secondary Education Establishments
Administrative Contact
Ib Misfeldt (Mr.)
Ustav fyziky materialu, Akademie Ved Ceske republiky, v.v.i.
Czechia
EU contribution
€ 144 000
Address
Zizkova 22
61662 Brno
Activity type
Research Organisations
Administrative Contact
Lenka Jakesova (Dr.)
INSTITUT ELEKTROZVARYUVANNYA IM.E.O. PATONA NACIONALNOI AKADEMII NAUK UKRAINY
Ukraine
EU contribution
€ 113 000
Address
Bozhenko Str. 11
03680 Kyiv
Activity type
Research Organisations
Administrative Contact
Oleg Makhnenko (Dr.)
GEORGIAN TECHNICAL UNIVERSITY
Georgia
EU contribution
€ 76 920
Address
Kostava 77
0175 Tbilisi
Activity type
Higher or Secondary Education Establishments
Administrative Contact
Elguja Kutelia (Prof.)
CHALMERS TEKNISKA HOEGSKOLA AB
Sweden
EU contribution
€ 324 194
Address
-
41296 Goeteborg
Activity type
Higher or Secondary Education Establishments
Administrative Contact
Annika Hofling (Ms.)
TECHNISCHE UNIVERSITAET GRAZ
Austria
EU contribution
€ 316 978
Address
Rechbauerstrasse 12
8010 Graz
Activity type
Higher or Secondary Education Establishments
Administrative Contact
Christof Sommitsch (Prof.)
IPP CENTRE LLC
Ukraine
EU contribution
€ 214 000
Address
Bolsunovska Street 8
01014 Kyiv
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
Administrative Contact
Ihor Bohdan (Mr.)