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Study on σ Phase in Fe–Al–Cr Alloys

College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
Chongqing Materials Research Institute, Chongqing 400707, China
Author to whom correspondence should be addressed.
Metals 2019, 9(10), 1092;
Received: 12 September 2019 / Revised: 8 October 2019 / Accepted: 9 October 2019 / Published: 11 October 2019
(This article belongs to the Special Issue Thermomechanical Processing of Steels)
In this paper, a method of using the second phase to control the grain growth in Fe–Al–Cr alloys was proposed, in order to obtain better mechanical properties. In Fe–Al–Cr alloys, austenitic transformation occurs by adding austenitizing elements, leading to the formation of the second phase and segregation at the grain boundaries, which hinders grain growth. FeCr(σ) phase was obtained in the Fe–Al–Cr alloys, which had grains of several microns and was coherent and coplanar with the matrix (Fe2AlCr). The nucleation of σ phase in Fe–Al–Cr alloy was controlled by the ratio of nickel to chromium. When the Ni/Cr (eq) ratio of alloys was more than 0.19, σ phase could nucleate in Fe–Al–Cr alloy. The relationship between austenitizing and nucleation of FeCr(σ) phase was given by thermodynamic calculation. View Full-Text
Keywords: high-aluminum steel; second phase; phase transition; thermodynamic calculation high-aluminum steel; second phase; phase transition; thermodynamic calculation
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Wang, J.; Liu, S.; Han, X. Study on σ Phase in Fe–Al–Cr Alloys. Metals 2019, 9, 1092.

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