Microstructure characterization of two Z-phase strengthened 12%chromium steels

• The microstructure of two Z-phase strengthened steels was characterized in different heat treatment conditions,as-tempered and after 1000 hours ageing at 650°C. A high Cr content together with Ta and N additions wereused to stimulate the formation of a fine distribution of Z-phase as strengthening particles in both alloys. Atomprobe tomography, transmission electron microscopy, and scanning electron microscopy were employed for adetailed characterization of the microstructure. The A1 steel contained very little carbon, which resulted in a fasttransformation from MX to Z-phase. In the A2 steel that contained a higher carbon content and an addition ofCu, the MX to Z-phase transformation was slower. The Cu addition to the A2 steel improved Laves-phasedistribution and morphology.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)

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