Microstructure of Z-Phase Strengthened Martensitic Steels: Meeting the 650°C Challenge
Artikel i vetenskaplig tidskrift, 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

precipitation

Z-phase strengthening

atom probe tomography

scanning electron microscopy

Författare

Fang Liu

Chalmers, Fysik, Biologisk fysik

Masoud Rashidi

Chalmers, Fysik, Biologisk fysik

John Hald

Danmarks Tekniske Universitet (DTU)

Lutz Reissig

Danmarks Tekniske Universitet (DTU)

Hans-Olof Andrén

Chalmers, Fysik, Biologisk fysik

Materials Science Forum

02555476 (ISSN)

Vol. 879 1147-1152

Styrkeområden

Energi

Materialvetenskap

Ämneskategorier

Metallurgi och metalliska material

Den kondenserade materiens fysik

Infrastruktur

Chalmers materialanalyslaboratorium

DOI

10.4028/www.scientific.net/MSF.879.1147

ISBN

978-303571129-5