期刊
MATERIALS LETTERS
卷 138, 期 -, 页码 96-99出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2014.09.104
关键词
Lightweight steel; kappa-carbide; Hardening; Decomposition; d-Spacing
资金
- TATA Steel
- Royal Academy of Engineering
- EPSRC at United Kingdom [EP/J011460/1]
- EPSRC [EP/J011460/2, EP/J011460/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J011460/2, EP/J011460/1] Funding Source: researchfish
kappa-carbide hardening in a ferrite-austenite duplex low-density Fe-Mn-Al-C steel has been investigated as a function of annealing temperature in a range between 500 degrees C and 900 degrees C. Fine microstructure containing thin lamellar kappa-carbides in austenite and dispersed nano-scale particulate kappa-carbides in ferrite were formed in a temperature below 600 degrees C. This led to a high hardness. The steel was soften drastically at the higher annealing temperature. This is due to the formation of boundary kappa-carbides, discontinuous coarsened kappa-carbides, and spheroidized kappa-carbides. The kappa-carbides inside ferrite grain were transformed into austenite at 800 degrees C. The kappa-carbides within austenite grain were dissolved at 900 degrees C. The kappa-carbides are found to have a close to Nishiyama-Wasserman orientation relationship with the ferrite matrix. (C) 2014 Elsevier B.V. All rights reserved
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