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Journal article

A new 12% chromium steel strengthened by Z-phase precipitates

By Liu, Fang1; Rashidi, Masoud1; Johansson, Lennart2; Hald, John3,4; Andren, Hans-Olof1

From

Chalmers University of Technology1

Siemens Industrial Turbomachinery AB2

Department of Mechanical Engineering, Technical University of Denmark3

Materials and Surface Engineering, Department of Mechanical Engineering, Technical University of Denmark4

In order to increase the corrosion resistance and simultaneously maintain the creep resistance of 9-12% Cr steels at 650 degrees C, a new alloy design concept was proposed, using thermodynamically stable Z-phase (CrTaN) precipitates to strengthen the steel. A new trial Z-phase strengthened 12% Cr steel was produced and creep tested.

The steel exhibited good long-term creep resistance. Dense nano-sized Z-phase precipitates were formed at an early stage, and coarsened slowly. They remained small after more than 10,000 h. (C) 2015 Elsevier Ltd. All rights reserved.

Language: English
Year: 2016
Pages: 93-96
ISSN: 18728456 and 13596462
Types: Journal article
DOI: 10.1016/j.scriptamat.2015.10.030
ORCIDs: Hald, John
Keywords

Creep Martensitic steels Three-dimensional atom probe Transmission election microscopy

Other keywords

Transmission electron microscopy

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