Experimental and theoretical investigation of precipitate coarsening rate in Z-phase strengthened steels
Artikel i vetenskaplig tidskrift, 2018

Two Z-phase strengthened 12% Cr steels were investigated: they are similar in composition, however one steel contains Nb and the other contains Ta. Z-phase precipitates (CrMN, M = Nb or Ta) provide precipitation hardening for creep resistance at 650 °C in these steels. Experimental data based on the transmission electron microscopy investigation of the size evolution of Z-phase precipitates during isothermal ageing at 650 °C show that the Ta-based Z-phase benefits from a five times smaller coarsening constant compared to the Nb-based Z-phase. Theoretical calculations show that this is attributed to the smaller diffusivity of Ta compared to Nb in the steel matrix. Besides, comparing the size of the Ta-based Z-phase precipitates in the gauge and head portion of a crept specimen, it is shown that Z-phase coarsens faster under stress.

Författare

[Person 9d560d0e-d724-4189-bc20-1cd7e88f64f4 not found]

Chalmers, Industri- och materialvetenskap, Material och tillverkning

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Kungliga Tekniska Högskolan (KTH)

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Siemens

[Person a40e3bc6-86cb-437e-9d4d-a43f3ab9e8fd not found]

Danmarks Tekniske Universitet (DTU)

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Chalmers, Fysik, Materialens mikrostruktur

[Person 498a39d1-9c2c-40f1-a628-ca5544befb0b not found]

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Materialia

25891529 (eISSN)

Vol. 4 247-254

Ämneskategorier

Fysikalisk kemi

Metallurgi och metalliska material

DOI

10.1016/j.mtla.2018.09.024

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Senast uppdaterat

2023-03-21