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Metallurgical and Materials Transactions A
Published in: Metallurgical and Materials Transactions A 8/2018

04-06-2018

Aging-Induced Transformations of Maraging-400 Alloys

Authors: T. J. B. Alves, G. C. S. Nunes, L. F. S. Tupan, P. W. C. Sarvezuk, F. F. Ivashita, C. A. S. de Oliveira, A. Paesano Jr.

Published in: Metallurgical and Materials Transactions A | Issue 8/2018

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Abstract

Solubilized maraging-400 alloys were aged at 480 °C, 580 °C, and 650 °C, for 3, 6, and 12 hours and characterized by X-ray diffraction (Rietveld refinement), Mössbauer spectroscopy, and microhardness tests. The results revealed that the aging treatments induced an atomic rearrangement in the martensite phase, involving a change in the composition and lattice parameters, reversion of austenite, and, in some samples, the formation of the μ phase. The amounts of reverted and precipitated phases were dependent on the aging time and temperature. The tetragonal distortion from cubic symmetry, usually presented by martensite in solution-annealed maraging steels, was not eliminated after aging. The results obtained for these maraging-400 alloys are compared with those obtained for maraging-350 steel samples.
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Footnotes
1
The A2/A3 ratio indicates the samples’ magnetic texture, which = 4 or 0, for magnetization that is fully parallel or fully perpendicular to the sample plane, respectively, and = 2 to a random magnetization; A1/A3 is always = 3.[6]
 
2
The Γ1/Γ2 and Γ2/Γ3 ratios indicate the variability of the atomic configuration around the iron atoms; both = 1 when the iron has only one type of neighborhood.[6]
 
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Metadata
Title
Aging-Induced Transformations of Maraging-400 Alloys
Authors
T. J. B. Alves
G. C. S. Nunes
L. F. S. Tupan
P. W. C. Sarvezuk
F. F. Ivashita
C. A. S. de Oliveira
A. Paesano Jr.
Publication date
04-06-2018
Publisher
Springer US
Published in
Metallurgical and Materials Transactions A / Issue 8/2018
Print ISSN: 1073-5623
Electronic ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-018-4724-y

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