Microstructure of Z-Phase Strengthened Martensitic Steels: Meeting the 650°C Challenge
Paper in 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, Physics, Materials Microstructure

Masoud Rashidi

Chalmers, Physics, Materials Microstructure

John Hald

Technical University of Denmark (DTU)

Lutz Reissig

Fraunhofer Institute for Mechanics of Materials (Fraunhofer IWM)

Hans-Olof Andrén

Chalmers, Physics, Materials Microstructure

Materials Science Forum

02555476 (ISSN)

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

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

Areas of Advance


Materials Science

Subject Categories

Metallurgy and Metallic Materials

Condensed Matter Physics


Chalmers Materials Analysis Laboratory



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7/5/2021 1