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Microstructure of Z-Phase Strengthened Martensitic Steels: Meeting the 650°C Challenge

Fang Liu (Institutionen för fysik, Materialens mikrostruktur (Chalmers)) ; Masoud Rashidi (Institutionen för fysik, Materialens mikrostruktur (Chalmers)) ; John Hald ; Lutz Reissig ; Hans-Olof Andrén (Institutionen för fysik, Materialens mikrostruktur (Chalmers))
Materials Science Forum (1662-9752). Vol. 879 (2017), p. 1147-1152.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Z-phase strengthening, precipitation, scanning electron microscopy, transmission electron microscopy, atom probe tomography



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Denna post skapades 2016-11-24. Senast ändrad 2017-06-21.
CPL Pubid: 245609