Microstructure of Z-Phase Strengthened Martensitic Steels: Meeting the 650°C Challenge
Paper i proceeding, 2017

We studied three series of Z-phase strengthened steels using scanning electron microscopy, transmission electron microscopy, and atom probe tomography to reveal the detailed microstructure of these steels. In particular, the phase transformation from M(C,N) to Z-phase (CrMN) was studied. Carbon content in the steels is the governing factor in this transformation. The impact toughness of some test alloys was rather low. This is attributed to the formation of a continuous W-rich film along prior austenite grain boundaries. Cu and C addition to the test alloys changed Laves phase morphology to discrete precipitates and improved toughness dramatically. BN particles were found in some steels. Formation of BN is directly linked to the B concentration in the steels.


transmission electron microscopy

Z-phase strengthening

atom probe tomography

scanning electron microscopy


Fang Liu

Chalmers, Fysik, Materialens mikrostruktur

Masoud Rashidi

Chalmers, Fysik, Materialens mikrostruktur

John Hald

Danmarks Tekniske Universitet (DTU)

Lutz Reissig

Fraunhofer-Institut für Werkstoffmechanik IWM (Fraunhofer IWM)

Hans-Olof Andrén

Chalmers, Fysik, Materialens mikrostruktur

Materials Science Forum

02555476 (ISSN) 16629752 (eISSN)

Vol. 879 1147-1152
978-303571129-5 (ISBN)

9th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2016
Graz, Austria,





Metallurgi och metalliska material

Den kondenserade materiens fysik


Chalmers materialanalyslaboratorium



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