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Description:

The precipitation behavior of M23C6 on random and coherent twin boundaries in aged 25Cr–20Ni–Nb–N steel was characterized. M23C6 on a random boundary has a cube-on-cube orientation relationship with a single-grain side and no orientation relationship with the other side. NbX was precipitated at the coherent interface on the random boundary. Two M23C6 particles were precipitated on both sides of the coherent twin boundary with a (1 1 1)M23C6-A//(1 1 1)M23C6-B and [1 1 0]M23C6-A//[1 1 0]M23C6-B orientation relationship, which is identical with that of the coherent twin boundary of austenite matrix. As a result, the M23C6 twin was formed at the original twin boundary. Both sides of the matrix/M23C6 interfaces satisfied a cube-on-cube orientation relationship with faceted interfaces parallel to (1 1 1)γ and (1 1 1)M23C6. NbX is precipitated at the M23C6 twin boundary.

Rights:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: Austenitic steel, Carbide, Coherent precipitation, Twin boundary

Date published: 2024-03-07

Publisher: Elsevier BV

Journal:

• Materials Letters (ISSN: 0167577X) vol. 363 136277

Funding:

• Japan Society for the Promotion of Science 22K14504 (高強度オーステナイト耐熱鋼の析出組織制御による長寿命化 )
• Iketani Science and Technology Foundation 0351201-A (高強度オーステナイト耐熱鋼の析出組織制御によるクリープ特性の向上)

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1016/j.matlet.2024.136277

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Updated at: 2024-03-19 16:57:27 +0900

Published on MDR: 2024-03-19 16:57:27 +0900